|
public DrawLinearGradient ( |
||
| gradient | ||
| startPoint | ||
| endPoint | ||
| options | CGGradientDrawingOptions | |
| return | void | |
internal static void Draw (CGContext ctx, GradientInfo gradient)
{
ctx.SaveState ();
ctx.Clip ();
using (var cg = new CGGradient (Util.DeviceRGBColorSpace, gradient.Colors.ToArray (), gradient.Stops.ToArray ())) {
if (gradient.Linear)
ctx.DrawLinearGradient (cg, gradient.Start, gradient.End, CGGradientDrawingOptions.DrawsBeforeStartLocation | CGGradientDrawingOptions.DrawsAfterEndLocation);
else
ctx.DrawRadialGradient (cg, gradient.Start, gradient.StartRadius, gradient.End, gradient.EndRadius, CGGradientDrawingOptions.DrawsBeforeStartLocation | CGGradientDrawingOptions.DrawsAfterEndLocation);
}
ctx.RestoreState ();
}
public static void FillGradient(CGContext context, RectangleF rect, CGColor color1, CGColor color2, bool isHorizontal)
{
CGGradient gradientBackground;
CGColorSpace colorSpace = CGColorSpace.CreateDeviceRGB();
float[] locationListBackground = new float[] { 1.0f, 0.0f };
List<float> colorListBackground = new List<float>();
colorListBackground.AddRange(color1.Components);
colorListBackground.AddRange(color2.Components);
gradientBackground = new CGGradient(colorSpace, colorListBackground.ToArray(), locationListBackground);
context.SaveState();
context.AddRect(rect);
context.Clip();
//context.ScaleCTM(1, -1);
if(isHorizontal)
context.DrawLinearGradient(gradientBackground, new PointF(rect.X, rect.Y), new PointF(rect.X + rect.Width, rect.Y + rect.Height), CGGradientDrawingOptions.DrawsBeforeStartLocation);
else
context.DrawLinearGradient(gradientBackground, new PointF(0, 0), new PointF(0, rect.Height), CGGradientDrawingOptions.DrawsBeforeStartLocation);
context.RestoreState();
}
void DrawPattern (CGContext context)
{
var start = new sd.PointF(0, 0);
var end = start + sectionSize;
context.ClipToRect(sd.RectangleF.Inflate (new sd.RectangleF(start, tileSize), 4, 4));
if (Wrap == GradientWrapMode.Reflect) {
for (int i = 0; i < 2; i ++) {
context.DrawLinearGradient (Gradient, start, end, 0);
context.DrawLinearGradient (InverseGradient, end, end + sectionSize, 0);
start = start + sectionSize + sectionSize;
end = end + sectionSize + sectionSize;
}
}
else {
for (int i = 0; i < 2; i ++) {
context.DrawLinearGradient (Gradient, start, end, 0);
start = start + sectionSize;
end = end + sectionSize;
}
}
}
