public void Draw(GraphicsHandler graphics, bool stroke, FillMode fillMode, bool clip)
{
var outerRadius = Radius.Width;
var yscale = Radius.Height / Radius.Width;
var center = Center;
var origin = GradientOrigin;
var scale = 1f;
var rect = graphics.Control.GetPathBoundingBox().ToEto();
if (stroke)
{
graphics.Control.ReplacePathWithStrokedPath();
}
if (clip)
{
graphics.Clip(fillMode);
}
if (wrap != GradientWrapMode.Pad)
{
// use eto's transformrectangle as it'll make the rect encompass the resulting transformed area
var boundRect = transform.Invert().ToEto().TransformRectangle(rect);
// find max number of iterations we need to fill the bounding rectangle
scale = GradientHelper.GetRadialScale(Center, Radius, GradientOrigin, boundRect);
}
if (Gradient == null || scale > lastScale)
{
var stops = GradientHelper.GetGradientStops(StartColor.ToCG(), EndColor.ToCG(), scale, wrap).ToList();
lastScale = scale;
Gradient = new CGGradient(CGColorSpace.CreateDeviceRGB(), stops.Select(r => r.Item2).ToArray(), stops.Select(r => (nfloat)r.Item1).ToArray());
}
else
{
scale = lastScale;
}
var scaledRect = new RectangleF(GradientOrigin - (GradientOrigin - Center + Radius) * scale, GradientOrigin + (Center + Radius - GradientOrigin) * scale);
center = scaledRect.Center;
outerRadius *= scale;
// adjust center based on ellipse scale from gradient origin
center.Y = origin.Y - (origin.Y - center.Y) / yscale;
// scale to draw elliptical gradient
var t = new CGAffineTransform(1, 0f, 0f, yscale, 0, origin.Y - origin.Y * yscale);
t.Multiply(transform);
graphics.Control.SaveState();
graphics.Control.ConcatCTM(t);
graphics.Control.DrawRadialGradient(Gradient, origin.ToNS(), 0, center.ToNS(), outerRadius, CGGradientDrawingOptions.DrawsAfterEndLocation | CGGradientDrawingOptions.DrawsBeforeStartLocation);
graphics.Control.RestoreState();
}
// test draw pattern
private void DrawTexture(CGContext context)
{
var destRect = new CGRect(0, 0, textureImage.Width, textureImage.Height);
//destRect = context.ConvertRectToUserSpace(destRect);
// [top] [left] main quadrant
context.ConcatCTM(textureImage.imageTransform);
context.DrawImage(destRect, variation.NativeCGImage);
context.ConcatCTM(textureImage.imageTransform.Invert());
if (wrapMode == WrapMode.TileFlipX || wrapMode == WrapMode.TileFlipXY)
{
// [top] right quadrant, flipped by the x axis
var transform = new CGAffineTransform(-1, 0, 0, 1, 2 * destRect.Width, 0);
context.ConcatCTM(transform);
context.ConcatCTM(textureImage.imageTransform);
context.DrawImage(destRect, variation.NativeCGImage);
context.ConcatCTM(textureImage.imageTransform.Invert());
context.ConcatCTM(transform.Invert());
}
if (wrapMode == WrapMode.TileFlipY || wrapMode == WrapMode.TileFlipXY)
{
// bottom [left] quadrant, flipped by the y axis
var transform = new CGAffineTransform(1, 0, 0, -1, 0, 2 * destRect.Height);
context.ConcatCTM(transform);
context.ConcatCTM(textureImage.imageTransform);
context.DrawImage(destRect, variation.NativeCGImage);
context.ConcatCTM(textureImage.imageTransform.Invert());
context.ConcatCTM(transform.Invert());
}
if (wrapMode == WrapMode.TileFlipXY)
{
// bottom-right quadrant, flipped by both the y and x axis
var transform = new CGAffineTransform(-1, 0, 0, -1, 2 * destRect.Width, 2 * destRect.Height);
context.ConcatCTM(transform);
context.ConcatCTM(textureImage.imageTransform);
context.DrawImage(destRect, variation.NativeCGImage);
context.ConcatCTM(textureImage.imageTransform.Invert());
context.ConcatCTM(transform.Invert());
}
}
public void Invert()
{
transform = transform.Invert();
}
public void Invert()
{
control = control.Invert();
}