635 lines
21 KiB
Vala
635 lines
21 KiB
Vala
namespace CairoChart {
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/**
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* {@link Chart} cursors.
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*/
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public class Cursors {
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protected unowned Chart chart;
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protected List<Point?> list = new List<Point?> ();
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protected Point active_cursor = Point(); // { get; protected set; default = Point128 (); }
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protected bool is_cursor_active = false; // { get; protected set; default = false; }
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protected Crossings[] crossings = {};
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/**
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* ``Cursors`` lines orientation.
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*/
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protected enum Orientation {
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/**
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* Vertical cursors.
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*/
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VERTICAL,
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/**
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* Horizontal cursors.
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*/
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HORIZONTAL
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}
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/**
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* ``Cursors`` style.
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*/
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public struct Style {
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/**
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* ``Cursors`` lines orientation.
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*/
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public Orientation orientation;
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/**
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* Maximum distance between mouse and cursor to remove it.
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*/
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public double select_distance;
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/**
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* ``Cursors`` line style.
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*/
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public LineStyle line_style;
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/**
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* Constructs a new ``Style``.
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*/
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public Style () {
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orientation = Orientation.VERTICAL;
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select_distance = 32;
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line_style = LineStyle(Color(0.2, 0.2, 0.2, 0.8));
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}
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}
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/**
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* Cursor style.
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*/
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public Style style = Style();
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/**
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* Value label style.
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*/
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public LabelStyle label_style = new LabelStyle();
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/**
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* Has crossings.
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*/
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public bool has_crossings { get { return crossings.length != 0; } protected set {} }
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/**
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* Constructs a new ``Chart``.
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* @param chart ``Chart`` instance.
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*/
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public Cursors (Chart chart) {
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this.chart = chart;
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}
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/**
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* Gets a copy of the ``Cursors``.
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*/
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public Cursors copy () {
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var c = new Cursors (chart);
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c.list = list.copy();
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c.active_cursor = active_cursor;
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c.is_cursor_active = is_cursor_active;
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c.style = style;
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c.label_style = label_style.copy();
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c.crossings = crossings;
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return c;
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}
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/**
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* Sets active cursor.
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* @param p ``Cursor`` position.
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* @param remove select for removing or not.
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*/
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public virtual void set_active (Point p, bool remove = false) {
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active_cursor.x = chart.zoom.x0 + (p.x - chart.plarea.x0) / chart.plarea.width * chart.zoom.width;
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active_cursor.y = chart.zoom.y1 - (chart.plarea.y1 - p.y) / chart.plarea.height * chart.zoom.height;
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is_cursor_active = ! remove;
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}
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/**
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* Adds active cursor.
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*/
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public virtual void add_active () {
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list.append (active_cursor);
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is_cursor_active = false;
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}
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/**
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* Removes active cursor.
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*/
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public virtual void remove_active () {
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if (list.length() == 0) return;
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var distance = 1024.0 * 1024;//width * width;
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uint rm_indx = 0;
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uint i = 0;
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foreach (var c in list) {
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double d = distance;
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switch (style.orientation) {
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case Orientation.VERTICAL: d = (rel2scr_x(c.x) - rel2scr_x(active_cursor.x)).abs(); break;
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case Orientation.HORIZONTAL: d = (rel2scr_y(c.y) - rel2scr_y(active_cursor.y)).abs(); break;
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}
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if (d < distance) {
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distance = d;
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rm_indx = i;
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}
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++i;
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}
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if (distance < style.select_distance)
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list.delete_link(list.nth(rm_indx));
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is_cursor_active = false;
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}
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/**
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* Gets delta between 2 cursors values.
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* @param delta returns delta value.
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*/
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public bool get_delta (out Float128 delta) {
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delta = 0;
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if (chart.series.length == 0) return false;
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if (list.length() + (is_cursor_active ? 1 : 0) != 2) return false;
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if (chart.joint_x && style.orientation == Orientation.VERTICAL) {
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Float128 val1 = chart.series[chart.zoom_1st_idx].axis_x.axis_val(rel2scr_x(list.nth_data(0).x));
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Float128 val2 = 0;
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if (is_cursor_active)
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val2 = chart.series[chart.zoom_1st_idx].axis_x.axis_val(rel2scr_x(active_cursor.x));
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else
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val2 = chart.series[chart.zoom_1st_idx].axis_x.axis_val(rel2scr_x(list.nth_data(1).x));
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if (val2 > val1)
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delta = val2 - val1;
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else
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delta = val1 - val2;
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return true;
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}
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if (chart.joint_y && style.orientation == Orientation.HORIZONTAL) {
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Float128 val1 = chart.series[chart.zoom_1st_idx].axis_y.axis_val(rel2scr_y(list.nth_data(0).y));
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Float128 val2 = 0;
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if (is_cursor_active)
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val2 = chart.series[chart.zoom_1st_idx].axis_y.axis_val(rel2scr_y(active_cursor.y));
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else
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val2 = chart.series[chart.zoom_1st_idx].axis_y.axis_val(rel2scr_y(list.nth_data(1).y));
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if (val2 > val1)
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delta = val2 - val1;
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else
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delta = val1 - val2;
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return true;
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}
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return false;
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}
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/**
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* Gets delta formatted string.
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*/
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public string get_delta_str () {
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Float128 delta = 0;
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if (!get_delta(out delta)) return "";
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var str = "";
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var s = chart.series[chart.zoom_1st_idx];
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if (chart.joint_x)
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switch (s.axis_x.dtype) {
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case Axis.DType.NUMBERS:
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str = s.axis_x.format.printf((LongDouble)delta);
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break;
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case Axis.DType.DATE_TIME:
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var date = "", time = "";
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int64 days = (int64)(delta / 24 / 3600);
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s.axis_x.print_dt(delta, out date, out time);
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str = days.to_string() + " + " + time;
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break;
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}
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if (chart.joint_y) {
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str = s.axis_y.format.printf((LongDouble)delta);
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}
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return str;
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}
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/**
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* Draws cursors.
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*/
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public virtual void draw () {
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if (chart.series.length == 0) return;
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var all_cursors = get_all_cursors();
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calc_cursors_value_positions();
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for (var cci = 0, max_cci = crossings.length; cci < max_cci; ++cci) {
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var low = Point128(chart.plarea.x1, chart.plarea.y1); // low and high
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var high = Point128(chart.plarea.x0, chart.plarea.y0); // points of the cursor
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unowned Cross[] ccs = crossings[cci].crossings;
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style.line_style.apply(chart);
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for (var ci = 0, max_ci = ccs.length; ci < max_ci; ++ci) {
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var si = ccs[ci].series_index;
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var s = chart.series[si];
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var p = ccs[ci].point;
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var scrp = s.scr_pnt(p);
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if (scrp.x < low.x) low.x = scrp.x;
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if (scrp.y < low.y) low.y = scrp.y;
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if (scrp.x > high.x) high.x = scrp.x;
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if (scrp.y > high.y) high.y = scrp.y;
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if (chart.joint_x) {
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switch (s.axis_x.position) {
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case Axis.Position.LOW: high.y = chart.plarea.y1 + s.axis_x.font.vspacing; break;
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case Axis.Position.HIGH: low.y = chart.plarea.y0 - s.axis_x.font.vspacing; break;
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case Axis.Position.BOTH:
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high.y = chart.plarea.y1 + s.axis_x.font.vspacing;
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low.y = chart.plarea.y0 - s.axis_x.font.vspacing;
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break;
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}
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}
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if (chart.joint_y) {
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switch (s.axis_y.position) {
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case Axis.Position.LOW: low.x = chart.plarea.x0 - s.axis_y.font.hspacing; break;
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case Axis.Position.HIGH: high.x = chart.plarea.x1 + s.axis_y.font.hspacing; break;
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case Axis.Position.BOTH:
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low.x = chart.plarea.x0 - s.axis_y.font.hspacing;
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high.x = chart.plarea.x1 + s.axis_y.font.hspacing;
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break;
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}
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}
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chart.ctx.move_to (ccs[ci].scr_point.x, ccs[ci].scr_point.y);
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chart.ctx.line_to (ccs[ci].scr_value_point.x, ccs[ci].scr_value_point.y);
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}
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var c = all_cursors.nth_data(crossings[cci].cursor_index);
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switch (style.orientation) {
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case Orientation.VERTICAL:
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if (low.y > high.y) continue;
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chart.ctx.move_to (rel2scr_x(c.x), low.y);
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chart.ctx.line_to (rel2scr_x(c.x), high.y);
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// show joint X value
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if (chart.joint_x) {
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var s = chart.series[chart.zoom_1st_idx];
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var x = s.axis_x.axis_val(rel2scr_x(c.x));
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string text = "", time_text = "";
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switch (s.axis_x.dtype) {
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case Axis.DType.NUMBERS: text = s.axis_x.format.printf((LongDouble)x); break;
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case Axis.DType.DATE_TIME: s.axis_x.print_dt(x, out text, out time_text); break;
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}
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var text_t = new Text(chart, text, s.axis_x.font, s.axis_x.color);
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var time_text_t = new Text(chart, time_text, s.axis_x.font, s.axis_x.color);
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var print_y = 0.0;
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switch (s.axis_x.position) {
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case Axis.Position.LOW: print_y = chart.area.y1 - s.axis_x.font.vspacing
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- (chart.legend.position == Legend.Position.BOTTOM ? chart.legend.height : 0);
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break;
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case Axis.Position.HIGH:
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var title_height = chart.title.height + (chart.legend.position == Legend.Position.TOP ?
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chart.title.font.vspacing * 2 : chart.title.font.vspacing);
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print_y = chart.area.y0 + title_height + s.axis_x.font.vspacing
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+ (chart.legend.position == Legend.Position.TOP ? chart.legend.height : 0);
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switch (s.axis_x.dtype) {
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case Axis.DType.NUMBERS:
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print_y += text_t.height;
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break;
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case Axis.DType.DATE_TIME:
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print_y += (s.axis_x.date_format == "" ? 0 : text_t.height)
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+ (s.axis_x.time_format == "" ? 0 : time_text_t.height)
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+ (s.axis_x.date_format == "" || s.axis_x.time_format == "" ? 0 : s.axis_x.font.vspacing);
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break;
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}
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break;
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}
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var print_x = s.axis_x.compact_rec_pos (x, text_t);
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chart.ctx.move_to (print_x, print_y);
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switch (s.axis_x.dtype) {
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case Axis.DType.NUMBERS:
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text_t.show();
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break;
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case Axis.DType.DATE_TIME:
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if (s.axis_x.date_format != "") text_t.show();
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print_x = s.axis_x.compact_rec_pos (x, time_text_t);
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chart.ctx.move_to (print_x, print_y - (s.axis_x.date_format == "" ? 0 : text_t.height + s.axis_x.font.vspacing));
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if (s.axis_x.time_format != "") time_text_t.show();
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break;
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}
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}
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break;
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case Orientation.HORIZONTAL:
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if (low.x > high.x) continue;
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chart.ctx.move_to (low.x, rel2scr_y(c.y));
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chart.ctx.line_to (high.x, rel2scr_y(c.y));
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// show joint Y value
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if (chart.joint_y) {
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var s = chart.series[chart.zoom_1st_idx];
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var y = s.axis_y.axis_val(rel2scr_y(c.y));
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var text_t = new Text(chart, s.axis_y.format.printf((LongDouble)y, s.axis_y.font));
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var print_y = s.axis_y.compact_rec_pos (y, text_t);
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var print_x = 0.0;
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switch (s.axis_y.position) {
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case Axis.Position.LOW:
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print_x = chart.area.x0 + s.axis_y.font.hspacing
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+ (chart.legend.position == Legend.Position.LEFT ? chart.legend.width : 0);
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break;
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case Axis.Position.HIGH:
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print_x = chart.area.x1 - text_t.width - s.axis_y.font.hspacing
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- (chart.legend.position == Legend.Position.RIGHT ? chart.legend.width : 0);
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break;
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}
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chart.ctx.move_to (print_x, print_y);
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text_t.show();
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}
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break;
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}
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chart.ctx.stroke ();
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// show value (X, Y or [X;Y])
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for (var ci = 0, max_ci = ccs.length; ci < max_ci; ++ci) {
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var si = ccs[ci].series_index;
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var s = chart.series[si];
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var point = ccs[ci].point;
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var size = ccs[ci].size;
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var svp = ccs[ci].scr_value_point;
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var show_x = ccs[ci].show_x;
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var show_date = ccs[ci].show_date;
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var show_time = ccs[ci].show_time;
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var show_y = ccs[ci].show_y;
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// value label background
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chart.color = label_style.bg_color;
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chart.ctx.rectangle (svp.x - size.x / 2, svp.y - size.y / 2, size.x, size.y);
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chart.ctx.fill();
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// value label frame
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label_style.frame_style.apply(chart);
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chart.ctx.move_to (svp.x - size.x / 2, svp.y - size.y / 2);
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chart.ctx.rel_line_to (size.x, 0);
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chart.ctx.rel_line_to (0, size.y);
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chart.ctx.rel_line_to (-size.x, 0);
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chart.ctx.rel_line_to (0, -size.y);
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chart.ctx.stroke();
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if (show_x) {
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chart.color = s.axis_x.color;
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var text_t = new Text(chart, s.axis_x.format.printf((LongDouble)point.x), s.axis_x.font);
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chart.ctx.move_to (svp.x - size.x / 2, svp.y + text_t.height / 2);
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if (chart.joint_x) chart.color = chart.joint_color;
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text_t.show();
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}
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if (show_time) {
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chart.color = s.axis_x.color;
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string date = "", time = "";
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s.axis_x.print_dt(point.x, out date, out time);
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var text_t = new Text(chart, time, s.axis_x.font);
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var y = svp.y + text_t.height / 2;
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if (show_date) y -= text_t.height / 2 + s.axis_x.font.vspacing / 2;
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chart.ctx.move_to (svp.x - size.x / 2, y);
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if (chart.joint_x) chart.color = chart.joint_color;
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text_t.show();
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}
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if (show_date) {
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chart.color = s.axis_x.color;
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string date = "", time = "";
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s.axis_x.print_dt(point.x, out date, out time);
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var text_t = new Text(chart, date, s.axis_x.font);
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var y = svp.y + text_t.height / 2;
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if (show_time) y += text_t.height / 2 + s.axis_x.font.vspacing / 2;
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chart.ctx.move_to (svp.x - size.x / 2, y);
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if (chart.joint_x) chart.color = chart.joint_color;
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text_t.show();
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}
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if (show_y) {
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chart.color = s.axis_y.color;
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var text_t = new Text(chart, s.axis_y.format.printf((LongDouble)point.y), s.axis_y.font);
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chart.ctx.move_to (svp.x + size.x / 2 - text_t.width, svp.y + text_t.height / 2);
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if (chart.joint_y) chart.color = chart.joint_color;
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text_t.show();
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}
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}
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}
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}
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/**
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* Evaluates crossings.
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*/
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public void eval_crossings () {
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var all_cursors = get_all_cursors();
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Crossings[] local_cursor_crossings = {};
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for (var ci = 0, max_ci = all_cursors.length(); ci < max_ci; ++ci) {
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var c = all_cursors.nth_data(ci);
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switch (style.orientation) {
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case Orientation.VERTICAL: if (c.x <= chart.zoom.x0 || c.x >= chart.zoom.x1) continue; break;
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case Orientation.HORIZONTAL: if (c.y <= chart.zoom.y0 || c.y >= chart.zoom.y1) continue; break;
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}
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Cross[] crossings = {};
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for (var si = 0, max_si = chart.series.length; si < max_si; ++si) {
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var s = chart.series[si];
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if (!s.zoom_show) continue;
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var points = Math.sort_points (s, s.sort);
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for (var i = 0; i + 1 < points.length; ++i) {
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switch (style.orientation) {
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case Orientation.VERTICAL:
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Float128 y = 0;
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if (Math.vcross(s.scr_pnt(points[i]), s.scr_pnt(points[i+1]), rel2scr_x(c.x),
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chart.plarea.y0, chart.plarea.y1, out y)) {
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var point = Point128(s.axis_x.axis_val(rel2scr_x(c.x)), s.axis_y.axis_val(y));
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Point size; bool show_x, show_date, show_time, show_y;
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cross_what_to_show(s, out show_x, out show_time, out show_date, out show_y);
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calc_cross_sizes (s, point, out size, show_x, show_time, show_date, show_y);
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Cross cc = {si, point, size, show_x, show_date, show_time, show_y};
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crossings += cc;
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}
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break;
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case Orientation.HORIZONTAL:
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Float128 x = 0;
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if (Math.hcross(s.scr_pnt(points[i]), s.scr_pnt(points[i+1]),
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chart.plarea.x0, chart.plarea.x1, rel2scr_y(c.y), out x)) {
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var point = Point128(s.axis_x.axis_val(x), s.axis_y.axis_val(rel2scr_y(c.y)));
|
|
Point size; bool show_x, show_date, show_time, show_y;
|
|
cross_what_to_show(s, out show_x, out show_time, out show_date, out show_y);
|
|
calc_cross_sizes (s, point, out size, show_x, show_time, show_date, show_y);
|
|
Cross cc = {si, point, size, show_x, show_date, show_time, show_y};
|
|
crossings += cc;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
if (crossings.length != 0) {
|
|
Crossings ccs = {ci, crossings};
|
|
local_cursor_crossings += ccs;
|
|
}
|
|
}
|
|
crossings = local_cursor_crossings;
|
|
}
|
|
|
|
protected struct Cross {
|
|
uint series_index;
|
|
Point128 point;
|
|
Point size;
|
|
bool show_x;
|
|
bool show_date;
|
|
bool show_time;
|
|
bool show_y;
|
|
Point scr_point;
|
|
Point scr_value_point;
|
|
}
|
|
|
|
protected struct Crossings {
|
|
uint cursor_index;
|
|
Cross[] crossings;
|
|
}
|
|
|
|
protected virtual Float128 rel2scr_x(Float128 x) {
|
|
return chart.plarea.x0 + chart.plarea.width * (x - chart.zoom.x0) / chart.zoom.width;
|
|
}
|
|
|
|
protected virtual Float128 rel2scr_y(Float128 y) {
|
|
return chart.plarea.y0 + chart.plarea.height * (y - chart.zoom.y0) / chart.zoom.height;
|
|
}
|
|
|
|
protected List<Point?> get_all_cursors () {
|
|
var all_cursors = list.copy_deep ((src) => { return src; });
|
|
if (is_cursor_active)
|
|
all_cursors.append(active_cursor);
|
|
return all_cursors;
|
|
}
|
|
|
|
protected virtual void scr2cell (int m, int n, Point p, out int i, out int j) {
|
|
i = (int)((p.x - chart.plarea.x0) / chart.plarea.width * m);
|
|
j = (int)((p.y - chart.plarea.y0) / chart.plarea.height * n);
|
|
}
|
|
|
|
protected virtual void cell2scr (int m, int n, int i, int j, out Point p) {
|
|
p = Point(chart.plarea.x0 + chart.plarea.width * (i + 0.5) / m,
|
|
chart.plarea.y0 + chart.plarea.height * (j + 0.5)/ n);
|
|
}
|
|
|
|
protected virtual void calc_cursors_value_positions () {
|
|
// 1. Find maximum width/height of cursors values.
|
|
var max_width = 1.0, max_height = 1.0;
|
|
for (var ccsi = 0, max_ccsi = crossings.length; ccsi < max_ccsi; ++ccsi) {
|
|
for (var cci = 0, max_cci = crossings[ccsi].crossings.length; cci < max_cci; ++cci) {
|
|
unowned Cross[] cr = crossings[ccsi].crossings;
|
|
max_width = double.max(max_width, cr[cci].size.x
|
|
+ 4 * double.max(chart.series[cr[cci].series_index].axis_x.font.hspacing,
|
|
chart.series[cr[cci].series_index].axis_y.font.hspacing));
|
|
max_height = double.max(max_height, cr[cci].size.y
|
|
+ 4 * double.max(chart.series[cr[cci].series_index].axis_x.font.vspacing,
|
|
chart.series[cr[cci].series_index].axis_y.font.vspacing));
|
|
}
|
|
}
|
|
|
|
// 2. Calculate 2D-array sizes.
|
|
var m = (int.max(1, (int)(chart.plarea.width / max_width))),
|
|
n = (int.max(1, (int)(chart.plarea.height / max_height)));
|
|
|
|
// 3. Create 2D-array of bool or links to cursors values.
|
|
var arr2d_e = new bool[m, n];
|
|
|
|
// 4. Set Busy/Cross Cells
|
|
for (var ccsi = 0, max_ccsi = crossings.length; ccsi < max_ccsi; ++ccsi) {
|
|
for (var cci = 0, max_cci = crossings[ccsi].crossings.length; cci < max_cci; ++cci) {
|
|
unowned Cross[] cr = crossings[ccsi].crossings;
|
|
cr[cci].scr_point = chart.series[cr[cci].series_index].scr_pnt (cr[cci].point);
|
|
int i = 0, j = 0;
|
|
scr2cell(m, n, cr[cci].scr_point, out i, out j);
|
|
arr2d_e[i, j] = true;
|
|
}
|
|
}
|
|
|
|
// 5. Calculate positions.
|
|
for (var ccsi = 0, max_ccsi = crossings.length; ccsi < max_ccsi; ++ccsi) {
|
|
for (var cci = 0, max_cci = crossings[ccsi].crossings.length; cci < max_cci; ++cci) {
|
|
unowned Cross[] cr = crossings[ccsi].crossings;
|
|
int i = 0, j = 0;
|
|
scr2cell(m, n, cr[cci].scr_point, out i, out j);
|
|
for (var radius = 1; radius < int.max(m, n); ++radius) {
|
|
bool found = false;
|
|
|
|
// top, bottom
|
|
int[] ll = {int.max(0, j - radius), int.min(n - 1, j + radius)};
|
|
foreach (var l in ll) {
|
|
for (var k = int.max(0, i - radius); k <= int.min(m - 1, i + radius); ++k) {
|
|
if (k == i) continue;
|
|
if (!arr2d_e[k, l]) {
|
|
arr2d_e[k, l] = true;
|
|
cell2scr(m, n, k, l, out cr[cci].scr_value_point);
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (found) break;
|
|
}
|
|
if (found) break;
|
|
|
|
// left, right
|
|
int[] kk = {int.max(0, i - radius), int.min(m - 1, i + radius)};
|
|
foreach (var k in kk) {
|
|
for (var l = int.max(0, j - radius); l <= int.min(n - 1, j + radius); ++l) {
|
|
if (l == j) continue;
|
|
if (!arr2d_e[k, l]) {
|
|
arr2d_e[k, l] = true;
|
|
cell2scr(m, n, k, l, out cr[cci].scr_value_point);
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (found) break;
|
|
}
|
|
if (found) break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
protected virtual void cross_what_to_show (Series s, out bool show_x, out bool show_time,
|
|
out bool show_date, out bool show_y) {
|
|
show_x = show_time = show_date = show_y = false;
|
|
switch (style.orientation) {
|
|
case Orientation.VERTICAL:
|
|
show_y = true;
|
|
if (!chart.joint_x)
|
|
switch (s.axis_x.dtype) {
|
|
case Axis.DType.NUMBERS: show_x = true; break;
|
|
case Axis.DType.DATE_TIME:
|
|
if (s.axis_x.date_format != "") show_date = true;
|
|
if (s.axis_x.time_format != "") show_time = true;
|
|
break;
|
|
}
|
|
break;
|
|
case Orientation.HORIZONTAL:
|
|
if (!chart.joint_y) show_y = true;
|
|
switch (s.axis_x.dtype) {
|
|
case Axis.DType.NUMBERS: show_x = true; break;
|
|
case Axis.DType.DATE_TIME:
|
|
if (s.axis_x.date_format != "") show_date = true;
|
|
if (s.axis_x.time_format != "") show_time = true;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
protected virtual void calc_cross_sizes (Series s, Point128 p, out Point size,
|
|
bool show_x = false, bool show_time = false,
|
|
bool show_date = false, bool show_y = false) {
|
|
if (show_x == show_time == show_date == show_y == false)
|
|
cross_what_to_show(s, out show_x, out show_time, out show_date, out show_y);
|
|
size = Point ();
|
|
string date, time;
|
|
s.axis_x.print_dt(p.x, out date, out time);
|
|
var date_t = new Text(chart, date, s.axis_x.font, s.axis_x.color);
|
|
var time_t = new Text(chart, time, s.axis_x.font, s.axis_x.color);
|
|
var x_t = new Text(chart, s.axis_x.format.printf((LongDouble)p.x), s.axis_x.font, s.axis_x.color);
|
|
var y_t = new Text(chart, s.axis_y.format.printf((LongDouble)p.y), s.axis_y.font, s.axis_y.color);
|
|
var h_x = 0.0, h_y = 0.0;
|
|
if (show_x) { size.x = x_t.width; h_x = x_t.height; }
|
|
if (show_date) { size.x = date_t.width; h_x = date_t.height; }
|
|
if (show_time) { size.x = double.max(size.x, time_t.width); h_x += time_t.height; }
|
|
if (show_y) { size.x += y_t.width; h_y = y_t.height; }
|
|
if ((show_x || show_date || show_time) && show_y) size.x += s.axis_x.font.hspacing + s.axis_y.font.hspacing;
|
|
if (show_date && show_time) h_x += s.axis_x.font.vspacing;
|
|
size.y = double.max (h_x, h_y);
|
|
}
|
|
}
|
|
}
|