363 lines
9.2 KiB
Vala
363 lines
9.2 KiB
Vala
namespace CairoChart {
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/**
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* Cairo/GTK+ ``Chart``.
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*/
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public class Chart {
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/**
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* ``Chart`` Position.
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*/
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public Cairo.Rectangle area = Cairo.Rectangle();
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/**
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* Current evaluated area.
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*/
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public Cairo.Rectangle evarea = Cairo.Rectangle()
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{ x = 0, y = 0, width = 1, height = 1 };
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/**
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* Zoom area limits (relative coordinates: 0.0-1.0).
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*/
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public Cairo.Rectangle zoom = Cairo.Rectangle()
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{ x = 0, y = 0, width = 1, height = 1 };
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/**
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* Plot area bounds.
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*/
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public Cairo.Rectangle plarea = Cairo.Rectangle()
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{ x = 0, y = 0, width = 1, height = 1 };
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/**
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* Cairo ``Context`` of the Drawing Area.
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*/
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public Cairo.Context ctx = null;
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/**
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* Background ``Color``.
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*/
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public Color bg_color = Color(1, 1, 1);
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/**
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* Border ``Color``.
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*/
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public Color border_color = Color(0, 0, 0, 0.3);
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/**
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* ``Chart`` Title.
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*/
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public Text title = new Text("Cairo Chart");
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/**
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* Legend.
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*/
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public Legend legend = new Legend();
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/**
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* ``Chart`` Series array.
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*/
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public Series[] series = {};
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/**
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* index of the 1'st shown series in a zoommed area.
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*/
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public int zoom_1st_idx { get; protected set; default = 0; }
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/**
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* Joint/common X axes or not.
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*/
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public bool joint_x { get; protected set; default = false; }
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/**
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* Joint/common Y axes or not.
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*/
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public bool joint_y { get; protected set; default = false; }
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/**
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* Joint/common {@link Axis} ``Color``.
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*/
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public Color joint_color = Color (0, 0, 0, 1);
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/**
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* Selection line style.
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*/
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public Line.Style selection_style = Line.Style ();
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/**
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* ``Chart`` cursors.
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*/
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public Cursors cursors { get; protected set; default = null; }
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/**
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* Set paint color for further drawing.
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*/
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public Color color {
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private get { return Color(); }
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set { ctx.set_source_rgba (value.red, value.green, value.blue, value.alpha); }
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default = Color();
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}
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/**
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* Constructs a new ``Chart``.
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*/
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public Chart () {
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cursors = new Cursors (this);
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}
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/**
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* Gets a copy of the ``Chart``.
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*/
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public Chart copy () {
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var chart = new Chart ();
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chart.area = this.area;
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chart.bg_color = this.bg_color;
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chart.border_color = this.border_color;
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chart.ctx = this.ctx;
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chart.cursors = this.cursors.copy();
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chart.evarea = this.evarea;
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chart.joint_color = this.joint_color;
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chart.joint_x = this.joint_x;
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chart.joint_y = this.joint_y;
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chart.legend = this.legend.copy();
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chart.plarea = this.plarea;
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chart.selection_style = this.selection_style;
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chart.series = this.series;
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chart.title = this.title.copy();
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chart.zoom = this.zoom;
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chart.zoom_1st_idx = this.zoom_1st_idx;
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return chart;
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}
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/**
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* Clears the ``Chart`` with a {@link bg_color} background color.
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*/
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public virtual void clear () {
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if (ctx != null) {
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color = bg_color;
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ctx.paint();
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}
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}
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/**
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* Draws the ``Chart``.
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*/
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public virtual bool draw () {
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evarea = area;
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draw_title ();
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fix_evarea ();
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legend.draw (this);
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fix_evarea ();
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rot_axes_titles ();
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cursors.get_crossings();
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eval_plarea ();
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draw_haxes ();
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fix_evarea ();
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draw_vaxes ();
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fix_evarea ();
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draw_plarea_border ();
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fix_evarea ();
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draw_series ();
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fix_evarea ();
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cursors.draw ();
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fix_evarea ();
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return true;
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}
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/**
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* Draws selection with a {@link selection_style} line style.
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* @param rect selection square.
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*/
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public virtual void draw_selection (Cairo.Rectangle rect) {
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selection_style.apply(this);
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ctx.rectangle (rect.x, rect.y, rect.width, rect.height);
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ctx.stroke();
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}
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/**
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* Zooms the ``Chart``.
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* @param rect selected zoom area.
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*/
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public virtual void zoom_in (Cairo.Rectangle rect) {
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foreach (var s in series) {
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if (!s.zoom_show) continue;
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var real_x0 = s.get_real_x (rect.x);
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var real_x1 = s.get_real_x (rect.x + rect.width);
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var real_width = real_x1 - real_x0;
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var real_y0 = s.get_real_y (rect.y);
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var real_y1 = s.get_real_y (rect.y + rect.height);
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var real_height = real_y0 - real_y1;
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// if selected square does not intersect with the series's square
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if ( real_x1 <= s.axis_x.zoom_min || real_x0 >= s.axis_x.zoom_max
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|| real_y0 <= s.axis_y.zoom_min || real_y1 >= s.axis_y.zoom_max) {
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s.zoom_show = false;
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continue;
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}
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if (real_x0 >= s.axis_x.zoom_min) {
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s.axis_x.zoom_min = real_x0;
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s.place.zoom_x_min = 0.0;
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} else {
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s.place.zoom_x_min = (s.axis_x.zoom_min - real_x0) / real_width;
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}
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if (real_x1 <= s.axis_x.zoom_max) {
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s.axis_x.zoom_max = real_x1;
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s.place.zoom_x_max = 1.0;
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} else {
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s.place.zoom_x_max = (s.axis_x.zoom_max - real_x0) / real_width;
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}
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if (real_y1 >= s.axis_y.zoom_min) {
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s.axis_y.zoom_min = real_y1;
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s.place.zoom_y_min = 0.0;
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} else {
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s.place.zoom_y_min = (s.axis_y.zoom_min - real_y1) / real_height;
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}
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if (real_y0 <= s.axis_y.zoom_max) {
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s.axis_y.zoom_max = real_y0;
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s.place.zoom_y_max = 1.0;
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} else {
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s.place.zoom_y_max = (s.axis_y.zoom_max - real_y1) / real_height;
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}
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}
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zoom_1st_idx = 0;
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for (var si = 0; si < series.length; ++si)
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if (series[si].zoom_show) {
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zoom_1st_idx = si;
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break;
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}
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var new_zoom = zoom;
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var rmpx = rect.x - plarea.x;
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var zdpw = zoom.width / plarea.width;
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new_zoom.x += rmpx * zdpw;
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var x_max = zoom.x + (rmpx + rect.width) * zdpw;
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new_zoom.width = x_max - new_zoom.x;
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var rmpy = rect.y - plarea.y;
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var zdph = zoom.height / plarea.height;
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new_zoom.y += rmpy * zdph;
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var y_max = zoom.y + (rmpy + rect.height) * zdph;
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new_zoom.height = y_max - new_zoom.y;
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zoom = new_zoom;
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}
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/**
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* Zooms out the ``Chart``.
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*/
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public virtual void zoom_out () {
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foreach (var s in series) s.unzoom();
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zoom = Cairo.Rectangle() { x = 0, y = 0, width = 1, height = 1 };
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zoom_1st_idx = 0;
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}
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/**
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* Moves the ``Chart``.
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* @param delta delta Δ(x;y) value to move the ``Chart``.
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*/
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public virtual void move (Point delta) {
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var d = delta;
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d.x /= -plarea.width;
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d.y /= -plarea.height;
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var x0 = zoom.x, x1 = zoom.x + zoom.width, y0 = zoom.y, y1 = zoom.y + zoom.height;
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zoom_out();
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d.x *= plarea.width;
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d.y *= plarea.height;
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var xmin = plarea.x + plarea.width * x0;
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var xmax = plarea.x + plarea.width * x1;
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var ymin = plarea.y + plarea.height * y0;
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var ymax = plarea.y + plarea.height * y1;
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d.x *= x1 - x0; d.y *= y1 - y0;
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var px1 = plarea.x + plarea.width;
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var py1 = plarea.y + plarea.height;
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if (xmin + d.x < plarea.x) d.x = plarea.x - xmin;
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if (xmax + d.x > px1) d.x = px1 - xmax;
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if (ymin + d.y < plarea.y) d.y = plarea.y - ymin;
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if (ymax + d.y > py1) d.y = py1 - ymax;
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zoom_in (Cairo.Rectangle(){x = xmin + d.x, y = ymin + d.y, width = xmax - xmin, height = ymax - ymin});
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}
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protected virtual void fix_evarea () {
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if (evarea.width < 0) evarea.width = 0;
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if (evarea.height < 0) evarea.height = 0;
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}
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protected virtual void rot_axes_titles () {
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for (var si = 0; si < series.length; ++si) {
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var s = series[si];
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s.axis_y.title.style.orientation = Font.Orientation.VERTICAL;
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}
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}
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protected virtual void eval_plarea () {
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plarea.x = evarea.x + legend.spacing;
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plarea.width = evarea.width - 2 * legend.spacing;
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plarea.y = evarea.y + legend.spacing;
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plarea.height = evarea.height - 2 * legend.spacing;
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// Check for joint axes
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joint_x = joint_y = true;
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int nzoom_series_show = 0;
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for (var si = series.length - 1; si >=0; --si) {
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var s = series[si], s0 = series[0];
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if (!s.zoom_show) continue;
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++nzoom_series_show;
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if (!s.equal_x_axis(s0)) joint_x = false;
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if (!s.equal_y_axis(s0)) joint_y = false;
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}
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if (nzoom_series_show == 1) joint_x = joint_y = false;
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for (var si = series.length - 1, nskip = 0; si >= 0; --si)
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series[si].join_calc(true, si, ref nskip);
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for (var si = series.length - 1, nskip = 0; si >= 0; --si)
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series[si].join_calc(false, si, ref nskip);
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}
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protected virtual void draw_plarea_border () {
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color = border_color;
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ctx.set_dash(null, 0);
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ctx.move_to (plarea.x, plarea.y);
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ctx.line_to (plarea.x, plarea.y + plarea.height);
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ctx.line_to (plarea.x + plarea.width, plarea.y + plarea.height);
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ctx.line_to (plarea.x + plarea.width, plarea.y);
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ctx.line_to (plarea.x, plarea.y);
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ctx.stroke ();
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}
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protected virtual void draw_title () {
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var sz = title.get_size(ctx);
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var title_height = sz.height + (legend.position == Legend.Position.TOP ? title.vspacing * 2 : title.vspacing);
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evarea.y += title_height;
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evarea.height -= title_height;
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color = title.color;
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ctx.move_to (area.width/2 - sz.width/2, sz.height + title.vspacing);
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title.show(ctx);
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}
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protected virtual void draw_haxes () {
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for (var si = series.length - 1, nskip = 0; si >=0; --si)
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series[si].draw_horizontal_axis (si, ref nskip);
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}
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protected virtual void draw_vaxes () {
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for (var si = series.length - 1, nskip = 0; si >=0; --si)
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series[si].draw_vertical_axis (si, ref nskip);
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}
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protected virtual void draw_series () {
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for (var si = 0; si < series.length; ++si) {
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var s = series[si];
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if (s.zoom_show && s.points.length != 0)
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s.draw();
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}
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}
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}
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}
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