435 lines
11 KiB
Vala
435 lines
11 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 Area area = new Area();
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/**
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* ``Chart`` Title.
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*/
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public Text title;
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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`` Series array.
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*/
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public Series[] series = {};
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/**
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* Legend.
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*/
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public Legend legend;
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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 LineStyle selection_style = LineStyle ();
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/**
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* Zoom Scroll speed.
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*/
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public double zoom_scroll_speed = 64.0;
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/**
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* Plot area bounds.
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*/
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public Area plarea = new Area();
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/**
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* Zoom area limits (relative coordinates: 0-1).
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*/
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public Area zoom = new Area();
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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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* Current evaluated plot area.
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*/
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public Area evarea = new Area();
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/**
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* ``Chart`` cursors.
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*/
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public virtual Cursors cursors { get; protected set; default = null; }
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/**
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* Joint/common X axes or not.
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*/
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public virtual 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 virtual bool joint_y { get; protected set; default = false; }
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/**
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* Index of the 1'st shown series in a zoomed area.
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*/
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public virtual int zoom_1st_idx { get; protected set; default = 0; }
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/**
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* Set paint color for further drawing.
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*/
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public virtual Color color {
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protected 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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title = new Text(this, "Cairo Chart");
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legend = new Legend(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 virtual Chart copy () {
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var chart = new Chart ();
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chart.area = this.area.copy();
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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.copy();
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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.copy();
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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.copy();
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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.copy();
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draw_title ();
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fix_evarea ();
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legend.draw ();
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fix_evarea ();
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rot_axes_titles ();
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cursors.eval_crossings();
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eval_plarea ();
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draw_axes ();
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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 area selection area.
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*/
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public virtual void draw_selection (Area area) {
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selection_style.apply(this);
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ctx.rectangle (area.x0, area.y0, area.width, area.height);
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ctx.stroke();
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}
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/**
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* Zooms in the ``Chart``.
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* @param area selected zoom area.
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*/
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public virtual void zoom_in (Area area) {
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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.axis_x.axis_val (area.x0);
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var real_x1 = s.axis_x.axis_val (area.x1);
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var real_width = real_x1 - real_x0;
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var real_y0 = s.axis_y.axis_val (area.y0);
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var real_y1 = s.axis_y.axis_val (area.y1);
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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.range.zmin || real_x0 >= s.axis_x.range.zmax
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|| real_y0 <= s.axis_y.range.zmin || real_y1 >= s.axis_y.range.zmax) {
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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.range.zmin) {
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s.axis_x.range.zmin = real_x0;
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s.axis_x.place.zmin = 0;
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} else {
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s.axis_x.place.zmin = (s.axis_x.range.zmin - real_x0) / real_width;
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}
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if (real_x1 <= s.axis_x.range.zmax) {
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s.axis_x.range.zmax = real_x1;
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s.axis_x.place.zmax = 1;
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} else {
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s.axis_x.place.zmax = (s.axis_x.range.zmax - real_x0) / real_width;
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}
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if (real_y1 >= s.axis_y.range.zmin) {
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s.axis_y.range.zmin = real_y1;
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s.axis_y.place.zmin = 0;
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} else {
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s.axis_y.place.zmin = (s.axis_y.range.zmin - real_y1) / real_height;
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}
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if (real_y0 <= s.axis_y.range.zmax) {
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s.axis_y.range.zmax = real_y0;
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s.axis_y.place.zmax = 1;
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} else {
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s.axis_y.place.zmax = (s.axis_y.range.zmax - 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.copy();
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var rmpx = area.x0 - plarea.x0;
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var zdpw = zoom.width / plarea.width;
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new_zoom.x0 += rmpx * zdpw;
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var x_max = zoom.x0 + (rmpx + area.width) * zdpw;
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new_zoom.width = x_max - new_zoom.x0;
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var rmpy = area.y0 - plarea.y0;
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var zdph = zoom.height / plarea.height;
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new_zoom.y0 += rmpy * zdph;
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var y_max = zoom.y0 + (rmpy + area.height) * zdph;
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new_zoom.height = y_max - new_zoom.y0;
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zoom = new_zoom.copy();
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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.zoom_out();
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zoom = new Area.with_abs (0, 0, 1, 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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if (plarea.width.abs() < 1 || plarea.height.abs() < 1) return;
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d.x /= -plarea.width; d.y /= -plarea.height;
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var z = zoom.copy();
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zoom_out();
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d.x *= plarea.width; d.y *= plarea.height;
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var x0 = plarea.x0 + plarea.width * z.x0;
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var x1 = plarea.x0 + plarea.width * z.x1;
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var y0 = plarea.y0 + plarea.height * z.y0;
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var y1 = plarea.y0 + plarea.height * z.y1;
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d.x *= z.width; d.y *= z.height;
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if (x0 + d.x < plarea.x0) d.x = plarea.x0 - x0;
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if (x1 + d.x > plarea.x1) d.x = plarea.x1 - x1;
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if (y0 + d.y < plarea.y0) d.y = plarea.y0 - y0;
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if (y1 + d.y > plarea.y1) d.y = plarea.y1 - y1;
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zoom_in(
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new Area.with_rel(
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x0 + d.x,
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y0 + d.y,
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plarea.width * z.width,
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plarea.height * z.height
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)
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);
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}
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/**
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* Zooms in the ``Chart`` by event point (scrolling).
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* @param p event position.
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*/
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public virtual void zoom_scroll_in (Point p) {
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var w = plarea.width, h = plarea.height;
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if (w < 8 || h < 8) return;
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zoom_in (
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new Area.with_abs(
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plarea.x0 + (p.x - plarea.x0) / w * zoom_scroll_speed,
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plarea.y0 + (p.y - plarea.y0) / h * zoom_scroll_speed,
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plarea.x1 - (plarea.x1 - p.x) / w * zoom_scroll_speed,
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plarea.y1 - (plarea.y1 - p.y) / h * zoom_scroll_speed
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)
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);
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}
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/**
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* Zooms out the ``Chart`` by event point (scrolling).
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* @param p event position.
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*/
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public virtual void zoom_scroll_out (Point p) {
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var z = zoom.copy(), pa = plarea.copy();
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var w = plarea.width, h = plarea.height;
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if (w < 8 || h < 8) return;
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zoom_out();
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var x0 = plarea.x0 + plarea.width * z.x0;
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var x1 = plarea.x0 + plarea.width * z.x1;
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var y0 = plarea.y0 + plarea.height * z.y0;
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var y1 = plarea.y0 + plarea.height * z.y1;
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var dx0 = (p.x - pa.x0) / w * zoom_scroll_speed;
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var dx1 = (pa.x1 - p.x) / w * zoom_scroll_speed;
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var dy0 = (p.y - pa.y0) / h * zoom_scroll_speed;
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var dy1 = (pa.y1 - p.y) / h * zoom_scroll_speed;
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if (x0 - dx0 < plarea.x0) x0 = plarea.x0; else x0 -= dx0;
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if (x1 + dx1 > plarea.x1) x1 = plarea.x1; else x1 += dx1;
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if (y0 - dy0 < plarea.y0) y0 = plarea.y0; else y0 -= dy0;
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if (y1 + dy1 > plarea.y1) y1 = plarea.y1; else y1 += dy1;
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zoom_in (new Area.with_abs(x0, y0, x1, y1));
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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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foreach (var s in series)
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s.axis_y.title.font.orient = Gtk.Orientation.VERTICAL;
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}
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protected virtual bool equal_x_axis (Series s1, Series s2) {
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if ( s1.axis_x.position != s2.axis_x.position
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|| s1.axis_x.range.zmin != s2.axis_x.range.zmin
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|| s1.axis_x.range.zmax != s2.axis_x.range.zmax
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|| s1.axis_x.place.zmin != s2.axis_x.place.zmin
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|| s1.axis_x.place.zmax != s2.axis_x.place.zmax
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|| s1.axis_x.dtype != s2.axis_x.dtype
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)
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return false;
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return true;
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}
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protected virtual bool equal_y_axis (Series s1, Series s2) {
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if ( s1.axis_y.position != s2.axis_y.position
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|| s1.axis_y.range.zmin != s2.axis_y.range.zmin
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|| s1.axis_y.range.zmax != s2.axis_y.range.zmax
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|| s1.axis_y.place.zmin != s2.axis_y.place.zmin
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|| s1.axis_y.place.zmax != s2.axis_y.place.zmax
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|| s1.axis_y.dtype != s2.axis_y.dtype
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)
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return false;
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return true;
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}
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protected virtual void eval_plarea () {
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plarea = evarea.copy();
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if (legend.show)
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switch(legend.position) {
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case Legend.Position.TOP: plarea.y0 += legend.spacing; break;
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case Legend.Position.BOTTOM: plarea.y1 -= legend.spacing; break;
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case Legend.Position.LEFT: plarea.x0 += legend.spacing; break;
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case Legend.Position.RIGHT: plarea.x1 -= legend.spacing; break;
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}
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// Check for joint axes
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joint_x = joint_y = true;
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int nshow = 0;
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foreach (var s in series) {
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if (!s.zoom_show) continue;
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if (!equal_x_axis(s, series[0])) joint_x = false;
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if (!equal_y_axis(s, series[0])) joint_y = false;
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++nshow;
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}
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if (nshow == 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].axis_x.join_axes(ref nskip);
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for (var si = series.length - 1, nskip = 0; si >= 0; --si)
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series[si].axis_y.join_axes(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.rectangle(plarea.x0, plarea.y0, plarea.width, plarea.height);
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ctx.stroke ();
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}
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protected virtual void draw_title () {
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var title_height = title.height + title.font.vspacing * 2;
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evarea.y0 += title_height;
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color = title.color;
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ctx.move_to (area.width/2 - title.width/2, title.height + title.font.vspacing);
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title.show();
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}
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protected virtual void draw_axes () {
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for (var si = series.length - 1, nskip = 0; si >=0; --si)
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series[si].axis_x.draw(ref nskip);
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for (var si = series.length - 1, nskip = 0; si >=0; --si)
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series[si].axis_y.draw(ref nskip);
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}
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protected virtual void draw_series () {
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foreach (var s in series)
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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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