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// This file is part of GNOME Boxes. License: LGPLv2+
private class Boxes.MiniGraph: Gtk.DrawingArea {
private double[] _points;
public double[] points { get { return _points; }
set {
_points = value;
queue_draw ();
}
}
public int npoints { get; set; default = -1; }
private double _ymax;
private double ymax { get { return _ymax; }
set {
_ymax = value;
ymax_set = true;
}
}
private bool ymax_set = false;
public MiniGraph (double[] points = {}, int npoints = -1) {
this.points = points;
this.npoints = npoints;
}
public MiniGraph.with_ymax (double[] points, double ymax, int npoints = -1) {
this.points = points;
this.ymax = ymax;
this.npoints = npoints;
}
private double max () {
if (points.length == 0)
return 1.0;
double max = points[0];
foreach (var p in points) {
if (p > max)
max = p;
}
return max;
}
public override bool draw (Cairo.Context cr) {
var width = get_allocated_width ();
var height = get_allocated_height ();
var style = get_style_context ();
Gdk.cairo_set_source_rgba (cr, style.get_background_color (get_state_flags ()));
cr.rectangle (0, 0, width, height);
cr.fill ();
var nstep = (npoints == -1 ? points.length : npoints) - 1;
var ymax = ymax_set ? ymax : max ();
var dy = 0.0;
var dx = 0.0;
if (nstep != 0)
dx = (double)width / nstep;
if (ymax != 0)
dy = (double)height / ymax;
Gdk.cairo_set_source_rgba (cr, style.get_color (Gtk.StateFlags.NORMAL));
var x = 0.0;
foreach (var p in points) {
var y = height - p * dy;
if (x == 0.0)
cr.move_to (x, y);
else
cr.line_to (x, y);
x += dx;
}
cr.line_to (x - dx, height);
cr.line_to (0, height);
cr.fill ();
Gdk.cairo_set_source_rgba (cr, style.get_border_color (get_state_flags ()));
cr.set_line_width (1.0);
x = 0.0;
foreach (var p in points) {
var y = height - p * dy;
if (x == 0.0)
cr.move_to (x, y);
else
cr.line_to (x, y);
x += dx;
}
cr.stroke ();
return true;
}
}
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