/// <summary>
/// Sets color and size.
/// </summary>
/// <remarks>
/// Creates a new gradient brush
/// if and only if a change in color or size made this necessary.
/// </remarks>
/// <param name="size"></param>
/// <param name="color"></param>
public void Update(SizeD size, Color color) {
if (!size.Equals(this.size) || !color.Equals(this.color)) {
// color or size have changed: update the gradient brush
brush = new LinearGradientBrush(new Point(),
new PointF((float) (size.Width/3),
(float) (size.Height/3)),
Color.FromArgb((byte) Math.Max(0, color.A - 50),
(byte) Math.Min(255, color.R*1.7),
(byte) Math.Min(255, color.G*1.7),
(byte) Math.Min(255, color.B*1.7)),
Color.FromArgb((byte) Math.Max(0, color.A - 50),
(byte) Math.Min(255, color.R*1.4),
(byte) Math.Min(255, color.G*1.4),
(byte) Math.Min(255, color.B*1.4))) {
WrapMode = WrapMode.TileFlipXY
};
}
this.size = size;
this.color = color;
}
public void EqualsEpsilon()
{
Assert.IsTrue(SizeD.Equals(sizeD, new SizeD(1.1, 1.9), 0.2));
Assert.IsTrue(SizeF.Equals(sizeF, new SizeF(1.1f, 1.9f), 0.2f));
}