|
public static CreateRadialGradient ( |
||
| center | ||
| radius | float | |
| colors | ||
| colorPos | float | |
| mode | SKShaderTileMode | |
| 리턴 | ||
public static void ComposeShader(SKCanvas canvas, int width, int height)
{
var colors = new [] { SKColors.Blue, SKColors.Yellow };
var center = new SKPoint(width / 2f, height / 2f);
using (var shader1 = SKShader.CreateRadialGradient(center, 180.0f, colors, null, SKShaderTileMode.Clamp))
using (var shader2 = SKShader.CreatePerlinNoiseTurbulence(0.025f, 0.025f, 2, 0.0f))
using (var shader = SKShader.CreateCompose(shader1, shader2))
using (var paint = new SKPaint())
{
paint.Shader = shader;
canvas.DrawPaint(paint);
}
}
private SKShader ReadRadialGradient(XElement e)
{
var centerX = ReadNumber(e.Attribute("cx"));
var centerY = ReadNumber(e.Attribute("cy"));
//var focusX = ReadOptionalNumber(e.Attribute("fx")) ?? centerX;
//var focusY = ReadOptionalNumber(e.Attribute("fy")) ?? centerY;
var radius = ReadNumber(e.Attribute("r"));
var absolute = e.Attribute("gradientUnits")?.Value == "userSpaceOnUse";
var tileMode = ReadSpreadMethod(e);
var stops = ReadStops(e);
// TODO: check gradientTransform attribute
// TODO: use absolute
return(SKShader.CreateRadialGradient(
new SKPoint(centerX, centerY),
radius,
stops.Values.ToArray(),
stops.Keys.ToArray(),
tileMode));
}