//Render:When your image has changed, call it
public void Render(ICanvasResourceCreator creator, float scaleX, float scaleY, ICanvasImage image)
{
//Scale :zoom up
ScaleEffect effect = new ScaleEffect
{
Source = image,
Scale = new Vector2(1 / scaleX, 1 / scaleY),
InterpolationMode = CanvasImageInterpolation.NearestNeighbor,
};
//Crop:So that it does not exceed the canvas boundary
Rect rect = effect.GetBounds(creator);
CropEffect effect2 = new CropEffect
{
Source = effect,
SourceRectangle = new Rect(2, 2, rect.Width - 4, rect.Height - 4),
};
//DottedLine
this.OutPut = new LuminanceToAlphaEffect //Alpha
{
Source = new EdgeDetectionEffect //Edge
{
Amount = 1,
Source = effect2
},
};
}
public void PaintSet(ICanvasResourceCreator rc, CanvasBitmap cb, float R, Color co)
{
//Paint：绘画
Paint = new CanvasCommandList(rc);
using (CanvasDrawingSession ds = Paint.CreateDrawingSession())
{
ds.FillEllipse(0, 0, R, R, PaintBrush(rc, R, PaintHard, PaintOpacity, co));
ICanvasImage ci = new ScaleEffect
{
Source = cb,
Scale = new Vector2(2 * R / cb.SizeInPixels.Width)
};
ds.DrawImage(ci, -R, -R, ci.GetBounds(rc), 1, CanvasImageInterpolation.HighQualityCubic, CanvasComposite.DestinationIn);
}
//Show：展示
var radius = (float)Math.Sqrt(R);
PaintShow = new CanvasCommandList(rc);
using (CanvasDrawingSession ds = PaintShow.CreateDrawingSession())
{
ds.FillEllipse(0, 0, radius, radius, PaintBrush(rc, radius, PaintHard, PaintOpacity, Colors.White));
ICanvasImage ci = new ScaleEffect
{
Source = cb,
Scale = new Vector2(2 * radius / cb.SizeInPixels.Width)
};
ds.DrawImage(ci, -radius, -radius, ci.GetBounds(rc), 1, CanvasImageInterpolation.HighQualityCubic, CanvasComposite.DestinationIn);
}
}
//方法：设置（写到创建资源事件里）
public void Set(ICanvasResourceCreator rc, float sx, float sy, ICanvasImage ci)
{
//放大
ScaleEffect se = new ScaleEffect
{
Source = ci,
Scale = new Vector2(1 / sx, 1 / sy),
InterpolationMode = CanvasImageInterpolation.NearestNeighbor,
};
//剪裁四周的边线
var rect = se.GetBounds(rc);
CropEffect sce = new CropEffect
{
Source = se,
SourceRectangle = new Rect(2, 2, rect.Width - 4, rect.Height - 4),
};
//恢复正常大小
CanvasCommandList ccl = new CanvasCommandList(rc);
using (var ds = ccl.CreateDrawingSession())
{
ds.Clear(Colors.Transparent);
ds.DrawImage(sce);
}
//变成线框
Image = new LuminanceToAlphaEffect //亮度转不透明度
{
Source = new EdgeDetectionEffect //边缘检测
{
Amount = 1,
Source = ccl
},
};
}