void tsetrect(trect re, double l, double t, double r, double b)
{
re.left = l;
re.top = t;
re.right = r;
re.bottom = b;
re.isIn = lastx >= re.left && lastx < re.right && lasty >= re.top && lasty < re.bottom;
}
void drawtrect(DrawContext c, trect tr, double r, double g, double bl)
{
var p = new Path(FillMode.Winding);
var b = new SolidColorBrush();
b.R = r;
b.G = g;
b.B = bl;
b.A = 1.0;
if (tr.isIn)
{
b.R += b.R * 0.75;
b.G += b.G * 0.75;
b.B += b.B * 0.75;
}
p.AddRectangle(tr.left,
tr.top,
tr.right - tr.left,
tr.bottom - tr.top);
p.End();
c.Fill(p, b);
p.Free();
}
