public void Render(Cairo.Context c, Gdk.Color @base)
{
// Fill the background
var color = CairoExtensions.RandomShadeOfGdkColor(@base);
c.Rectangle(X, Y, Width, Height);
c.SetSourceRGB(color.R, color.G, color.B);
c.Fill();
if (Children == null)
{
int w, h;
// Render the item text
using (var p = Pango.CairoHelper.CreateLayout(c))
{
p.SetText(Title);
p.Width = (int)(Pango.Scale.PangoScale * Width);
p.Ellipsize = Pango.EllipsizeMode.End;
p.GetPixelSize(out w, out h);
c.SetSourceRGB(1.0, 1.0, 1.0);
if (w <= Width && h <= Height)
{
c.MoveTo(X + ((Width - w) / 2), Y + ((Height - h) / 2));
Pango.CairoHelper.ShowLayout(c, p);
}
}
}
else
{
Children.ForEach(delegate(TreeMapItem i) {
i.Render(c, @base);
});
}
// Lose our reference to the title
Title = String.Empty;
}
void UpdateBgImage()
{
m_bgImage = null;
if (TextColumn < 0 || WeightColumn < 0)
{
return;
}
m_bgImage = new Cairo.ImageSurface(Format.Rgb24, Allocation.Width, this.Allocation.Height);
using (var c = new Cairo.Context(m_bgImage))
{
// Paint the default background (linear gradient)
var g = new Cairo.LinearGradient(0, 0, 1, this.Allocation.Height);
g.AddColorStop(0.2, CairoExtensions.GdkColorToCairoColor(m_Background));
g.AddColorStop(0.9, CairoExtensions.GdkColorToCairoColor(this.Style.Background(Gtk.StateType.Normal)));
c.Rectangle(0, 0, this.Allocation.Width, this.Allocation.Height);
c.Pattern = g;
c.Paint();
g.Dispose();
Gtk.TreeIter iter;
List <TreeMapItem> rootItems = new List <TreeMapItem> ();
if (m_Model.GetIterFirst(out iter))
{
do
{
var item = new TreeMapItem(m_Model, ref iter, true, m_TextColumn, m_WeightColumn);
rootItems.Add(item);
} while (m_Model.IterNext(ref iter));
double t = 0.0;
rootItems.ForEach(delegate(TreeMapItem i) {
t += Math.Abs(i.Weight);
});
double x = 0, y = 0, w = this.Allocation.Width, h = this.Allocation.Height;
double myx = 0, myy = 0, myw = 0, myh = 0;
rootItems.ForEach(delegate(TreeMapItem i) {
var ratio = Math.Abs(i.Weight) / t;
myx = x;
myy = y;
myw = w * ratio;
myh = h;
x += myw;
i.SetArea(myx, myy, myw, myh);
i.Render(c, m_Background);
});
// clear right away to lower refs
if (this.m_rootItems != null)
{
this.m_rootItems.Clear();
}
this.m_rootItems = rootItems;
}
}
}