463 lines
15 KiB
Vala
463 lines
15 KiB
Vala
namespace CairoChart {
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public class Chart {
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public double x_min = 0.0;
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public double y_min = 0.0;
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public double width = 0.0;
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public double height = 0.0;
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public Cairo.Context context = null;
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public Color bg_color = Color(1, 1, 1);
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public Text title = new Text ("Cairo Chart");
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public Color border_color = Color(0, 0, 0, 0.3);
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public Legend legend = new Legend ();
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public Series[] series = {};
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public double cur_x_min = 0.0;
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public double cur_x_max = 1.0;
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public double cur_y_min = 0.0;
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public double cur_y_max = 1.0;
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// relative zoom limits
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public double rz_x_min { get; protected set; default = 0.0; }
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public double rz_x_max { get; protected set; default = 1.0; }
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public double rz_y_min { get; protected set; default = 0.0; }
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public double rz_y_max { get; protected set; default = 1.0; }
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public int zoom_first_show { get; protected set; default = 0; }
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public double title_width { get; protected set; default = 0.0; }
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public double title_height { get; protected set; default = 0.0; }
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public double title_indent = 4;
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public Line.Style selection_style = Line.Style ();
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public double plot_x_min = 0;
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public double plot_x_max = 0;
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public double plot_y_min = 0;
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public double plot_y_max = 0;
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public bool joint_x { get; protected set; default = false; }
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public bool joint_y { get; protected set; default = false; }
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public Color joint_axis_color = Color (0, 0, 0, 1);
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public CairoChart.Math math { get; protected set; default = new Math(); }
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public Cursors cursors2 { get; protected set; default = new Cursors (); }
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public List<Point?> cursors = new List<Point?> ();
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public Point active_cursor = Point(); // { get; protected set; default = Point128 (); }
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public bool is_cursor_active { get; protected set; default = false; }
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public Cursors.Style cursor_style = Cursors.Style();
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public Cursors.CursorCrossings[] cursors_crossings = {};
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public 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.active_cursor = this.active_cursor;
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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.joint_x = this.joint_x;
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chart.joint_y = this.joint_y;
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chart.context = this.context;
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chart.cur_x_max = this.cur_x_max;
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chart.cur_x_min = this.cur_x_min;
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chart.cur_y_max = this.cur_y_max;
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chart.cur_y_min = this.cur_y_min;
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chart.cursor_style = this.cursor_style;
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chart.cursors = this.cursors.copy();
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chart.cursors2 = this.cursors2.copy();
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chart.cursors_crossings = this.cursors_crossings;
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chart.height = this.height;
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chart.is_cursor_active = this.is_cursor_active;
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chart.legend = this.legend.copy();
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chart.plot_x_max = this.plot_x_max;
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chart.plot_x_min = this.plot_x_min;
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chart.plot_y_max = this.plot_y_max;
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chart.plot_y_min = this.plot_y_min;
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chart.rz_x_min = this.rz_x_min;
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chart.rz_x_max = this.rz_x_max;
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chart.rz_y_min = this.rz_y_min;
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chart.rz_y_max = this.rz_y_max;
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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.title_height = this.title_height;
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chart.title_indent = this.title_indent;
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chart.title_width = this.title_width;
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chart.width = this.width;
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chart.x_min = this.x_min;
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chart.y_min = this.y_min;
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chart.zoom_first_show = this.zoom_first_show;
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return chart;
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}
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protected virtual void check_cur_values () {
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if (cur_x_min > cur_x_max)
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cur_x_max = cur_x_min;
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if (cur_y_min > cur_y_max)
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cur_y_max = cur_y_min;
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}
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public virtual void clear () {
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draw_background ();
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}
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public virtual bool draw () {
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cur_x_min = x_min;
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cur_y_min = y_min;
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cur_x_max = x_min + width;
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cur_y_max = y_min + height;
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draw_chart_title ();
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check_cur_values ();
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legend.draw (this);
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check_cur_values ();
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set_vertical_axes_titles ();
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cursors2.get_cursors_crossings(this);
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calc_plot_area ();
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draw_horizontal_axes ();
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check_cur_values ();
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draw_vertical_axes ();
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check_cur_values ();
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draw_plot_area_border ();
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check_cur_values ();
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draw_series ();
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check_cur_values ();
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cursors2.draw_cursors (this);
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check_cur_values ();
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return true;
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}
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public virtual void set_source_rgba (Color color) {
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context.set_source_rgba (color.red, color.green, color.blue, color.alpha);
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}
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protected virtual void draw_background () {
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if (context != null) {
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set_source_rgba (bg_color);
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context.paint();
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set_source_rgba (Color (0, 0, 0, 1));
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}
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}
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public virtual void zoom_in (Cairo.Rectangle rect) {
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var x1 = rect.x + rect.width;
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var y1 = rect.y + rect.height;
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for (var si = 0, max_i = series.length; si < max_i; ++si) {
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var s = series[si];
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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 (x1);
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var real_y0 = s.get_real_y (rect.y);
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var real_y1 = s.get_real_y (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_x1 - real_x0);
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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_x1 - real_x0);
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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_y0 - real_y1);
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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_y0 - real_y1);
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}
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}
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zoom_first_show = 0;
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for (var si = 0, max_i = series.length; si < max_i; ++si)
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if (series[si].zoom_show) {
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zoom_first_show = si;
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break;
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}
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var new_rz_x_min = rz_x_min + (rect.x - plot_x_min) / (plot_x_max - plot_x_min) * (rz_x_max - rz_x_min);
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var new_rz_x_max = rz_x_min + (x1 - plot_x_min) / (plot_x_max - plot_x_min) * (rz_x_max - rz_x_min);
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var new_rz_y_min = rz_y_min + (rect.y - plot_y_min) / (plot_y_max - plot_y_min) * (rz_y_max - rz_y_min);
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var new_rz_y_max = rz_y_min + (y1 - plot_y_min) / (plot_y_max - plot_y_min) * (rz_y_max - rz_y_min);
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rz_x_min = new_rz_x_min;
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rz_x_max = new_rz_x_max;
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rz_y_min = new_rz_y_min;
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rz_y_max = new_rz_y_max;
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}
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public virtual void zoom_out () {
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foreach (var s in series) {
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s.zoom_show = true;
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s.axis_x.zoom_min = s.axis_x.min;
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s.axis_x.zoom_max = s.axis_x.max;
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s.axis_y.zoom_min = s.axis_y.min;
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s.axis_y.zoom_max = s.axis_y.max;
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s.place.zoom_x_min = s.place.x_min;
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s.place.zoom_x_max = s.place.x_max;
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s.place.zoom_y_min = s.place.y_min;
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s.place.zoom_y_max = s.place.y_max;
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}
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rz_x_min = 0;
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rz_x_max = 1;
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rz_y_min = 0;
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rz_y_max = 1;
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zoom_first_show = 0;
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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 /= plot_x_max - plot_x_min; d.x *= - 1.0;
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d.y /= plot_y_max - plot_y_min; d.y *= - 1.0;
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var rzxmin = rz_x_min, rzxmax = rz_x_max, rzymin = rz_y_min, rzymax = rz_y_max;
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zoom_out();
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d.x *= plot_x_max - plot_x_min;
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d.y *= plot_y_max - plot_y_min;
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var xmin = plot_x_min + (plot_x_max - plot_x_min) * rzxmin;
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var xmax = plot_x_min + (plot_x_max - plot_x_min) * rzxmax;
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var ymin = plot_y_min + (plot_y_max - plot_y_min) * rzymin;
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var ymax = plot_y_min + (plot_y_max - plot_y_min) * rzymax;
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d.x *= rzxmax - rzxmin; d.y *= rzymax - rzymin;
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if (xmin + d.x < plot_x_min) d.x = plot_x_min - xmin;
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if (xmax + d.x > plot_x_max) d.x = plot_x_max - xmax;
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if (ymin + d.y < plot_y_min) d.y = plot_y_min - ymin;
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if (ymax + d.y > plot_y_max) d.y = plot_y_max - 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 draw_chart_title () {
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var sz = title.get_size(context);
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title_height = sz.height + (legend.position == Legend.Position.TOP ? title_indent * 2 : title_indent);
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cur_y_min += title_height;
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set_source_rgba(title.color);
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context.move_to (width/2 - sz.width/2, sz.height + title_indent);
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title.show(context);
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}
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public virtual void draw_selection (Cairo.Rectangle rect) {
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selection_style.set(this);
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context.rectangle (rect.x, rect.y, rect.width, rect.height);
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context.stroke();
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}
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protected virtual void set_vertical_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 join_calc (bool is_x) {
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for (var si = series.length - 1, nskip = 0; si >= 0; --si) {
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var s = series[si];
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Axis axis = s.axis_x;
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if (!is_x) axis = s.axis_y;
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if (!s.zoom_show) continue;
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if (nskip != 0) {--nskip; continue;}
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double max_rec_width = 0; double max_rec_height = 0;
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axis.calc_rec_sizes (this, out max_rec_width, out max_rec_height, is_x);
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var max_font_indent = axis.font_indent;
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var max_axis_font_width = axis.title.text == "" ? 0 : axis.title.get_width(context) + axis.font_indent;
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var max_axis_font_height = axis.title.text == "" ? 0 : axis.title.get_height(context) + axis.font_indent;
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if (is_x)
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s.join_relative_x_axes (si, true, ref max_rec_width, ref max_rec_height, ref max_font_indent, ref max_axis_font_height, ref nskip);
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else
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s.join_relative_y_axes (si, true, ref max_rec_width, ref max_rec_height, ref max_font_indent, ref max_axis_font_width, ref nskip);
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// for 4.2. Cursor values for joint X axis
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if (si == zoom_first_show && cursors_crossings.length != 0) {
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switch (cursor_style.orientation) {
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case Cursors.Orientation.VERTICAL:
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if (is_x && joint_x)
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switch (axis.position) {
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case Axis.Position.LOW: plot_y_max -= max_rec_height + axis.font_indent; break;
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case Axis.Position.HIGH: plot_y_min += max_rec_height + axis.font_indent; break;
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}
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break;
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case Cursors.Orientation.HORIZONTAL:
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if (!is_x && joint_y)
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switch (s.axis_y.position) {
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case Axis.Position.LOW: plot_x_min += max_rec_width + s.axis_y.font_indent; break;
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case Axis.Position.HIGH: plot_x_max -= max_rec_width + s.axis_y.font_indent; break;
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}
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break;
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}
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}
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if (is_x && (!joint_x || si == zoom_first_show))
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switch (axis.position) {
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case Axis.Position.LOW: plot_y_max -= max_rec_height + max_font_indent + max_axis_font_height; break;
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case Axis.Position.HIGH: plot_y_min += max_rec_height + max_font_indent + max_axis_font_height; break;
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}
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if (!is_x && (!joint_y || si == zoom_first_show))
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switch (s.axis_y.position) {
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case Axis.Position.LOW: plot_x_min += max_rec_width + max_font_indent + max_axis_font_width; break;
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case Axis.Position.HIGH: plot_x_max -= max_rec_width + max_font_indent + max_axis_font_width; break;
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}
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}
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}
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protected virtual void calc_plot_area () {
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plot_x_min = cur_x_min + legend.indent;
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plot_x_max = cur_x_max - legend.indent;
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plot_y_min = cur_y_min + legend.indent;
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plot_y_max = cur_y_max - legend.indent;
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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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join_calc (true);
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join_calc (false);
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}
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protected virtual void draw_horizontal_axes () {
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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_vertical_axes () {
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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_plot_area_border () {
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set_source_rgba (border_color);
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context.set_dash(null, 0);
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context.move_to (plot_x_min, plot_y_min);
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context.line_to (plot_x_min, plot_y_max);
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context.line_to (plot_x_max, plot_y_max);
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context.line_to (plot_x_max, plot_y_min);
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context.line_to (plot_x_min, plot_y_min);
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context.stroke ();
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}
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protected virtual bool x_in_plot_area (double x) {
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if (math.x_in_range(x, plot_x_min, plot_x_max))
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return true;
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return false;
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}
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protected virtual bool y_in_plot_area (double y) {
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if (math.y_in_range(y, plot_y_min, plot_y_max))
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return true;
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return false;
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}
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public virtual bool point_in_plot_area (Point p) {
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if (math.point_in_rect (p, plot_x_min, plot_x_max, plot_y_min, plot_y_max))
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return true;
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return false;
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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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public virtual void set_active_cursor (Point p, bool remove = false) {
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active_cursor = scr2rel_point(p);
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is_cursor_active = ! remove;
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}
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public virtual void add_active_cursor () {
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cursors.append (active_cursor);
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is_cursor_active = false;
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}
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public virtual void remove_active_cursor () {
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if (cursors.length() == 0) return;
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var distance = 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 cursors) {
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double d = distance;
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switch (cursor_style.orientation) {
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case Cursors.Orientation.VERTICAL:
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d = (rel2scr_x(c.x) - rel2scr_x(active_cursor.x)).abs();
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break;
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case Cursors.Orientation.HORIZONTAL:
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d = (rel2scr_y(c.y) - rel2scr_y(active_cursor.y)).abs();
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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 < cursor_style.select_distance)
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cursors.delete_link(cursors.nth(rm_indx));
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is_cursor_active = false;
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}
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protected virtual Float128 scr2rel_x (Float128 x) {
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return rz_x_min + (x - plot_x_min) / (plot_x_max - plot_x_min) * (rz_x_max - rz_x_min);
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}
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protected virtual Float128 scr2rel_y (Float128 y) {
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return rz_y_max - (plot_y_max - y) / (plot_y_max - plot_y_min) * (rz_y_max - rz_y_min);
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}
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protected virtual Point scr2rel_point (Point p) {
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return Point (scr2rel_x(p.x), scr2rel_y(p.y));
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}
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public virtual Float128 rel2scr_x(Float128 x) {
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return plot_x_min + (plot_x_max - plot_x_min) * (x - rz_x_min) / (rz_x_max - rz_x_min);
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}
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|
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public virtual Float128 rel2scr_y(Float128 y) {
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return plot_y_min + (plot_y_max - plot_y_min) * (y - rz_y_min) / (rz_y_max - rz_y_min);
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}
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public virtual Point128 rel2scr_point (Point128 p) {
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return Point128 (rel2scr_x(p.x), rel2scr_y(p.y));
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}
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}
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}
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