367 lines
11 KiB
Vala
367 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 Cairo.Rectangle pos = Cairo.Rectangle();
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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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* 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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* 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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* Legend.
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*/
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public Legend legend = new Legend ();
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/**
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* Chart Series.
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*/
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public Series[] series = {};
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/**
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* Current calculated Plot Position.
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*/
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public Cairo.Rectangle calc_pos = Cairo.Rectangle()
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{ x = 0, y = 0, width = 1, height = 1 };
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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 cursors { get; protected set; default = new Cursors (); }
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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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public Chart () { }
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public Chart copy () {
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var chart = new Chart ();
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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.ctx = this.ctx;
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chart.calc_pos = this.calc_pos;
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chart.cursors = this.cursors.copy();
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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.pos = this.pos;
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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 fix_calc_pos () {
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if (calc_pos.width < 0) calc_pos.width = 0;
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if (calc_pos.height < 0) calc_pos.height = 0;
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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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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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color = Color (0, 0, 0, 1);
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}
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}
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public virtual bool draw () {
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calc_pos = pos;
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draw_chart_title ();
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fix_calc_pos ();
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legend.draw (this);
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fix_calc_pos ();
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set_vertical_axes_titles ();
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cursors.get_cursors_crossings(this);
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calc_plot_area ();
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draw_horizontal_axes ();
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fix_calc_pos ();
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draw_vertical_axes ();
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fix_calc_pos ();
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draw_plot_area_border ();
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fix_calc_pos ();
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draw_series ();
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fix_calc_pos ();
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cursors.draw_cursors (this);
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fix_calc_pos ();
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return true;
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}
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protected virtual void draw_chart_title () {
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var sz = title.get_size(ctx);
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title_height = sz.height + (legend.position == Legend.Position.TOP ? title_indent * 2 : title_indent);
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calc_pos.y += title_height;
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calc_pos.height -= title_height;
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color = title.color;
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ctx.move_to (pos.width/2 - sz.width/2, sz.height + title_indent);
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title.show(ctx);
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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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ctx.rectangle (rect.x, rect.y, rect.width, rect.height);
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ctx.stroke();
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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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color = border_color;
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ctx.set_dash(null, 0);
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ctx.move_to (plot_x_min, plot_y_min);
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ctx.line_to (plot_x_min, plot_y_max);
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ctx.line_to (plot_x_max, plot_y_max);
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ctx.line_to (plot_x_max, plot_y_min);
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ctx.line_to (plot_x_min, plot_y_min);
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ctx.stroke ();
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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 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 join_calc (bool is_x) {
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for (var si = series.length - 1, nskip = 0; si >= 0; --si)
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series[si].join_calc(is_x, si, ref nskip);
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}
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protected virtual void calc_plot_area () {
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plot_x_min = calc_pos.x + legend.indent;
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plot_x_max = calc_pos.x + calc_pos.width - legend.indent;
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plot_y_min = calc_pos.y + legend.indent;
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plot_y_max = calc_pos.y + calc_pos.height - 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 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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public 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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public 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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public 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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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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