protected override void OnPaintSurface(SKPaintSurfaceEventArgs e)
{
base.OnPaintSurface(e);
SKImageInfo info = e.Info;
SKSurface surface = e.Surface;
SKCanvas canvas = surface.Canvas;
canvas.Clear();
if (StartColor != Color.Transparent || EndColor != Color.Transparent)
{
var colors = new SKColor[] { StartColor.ToSKColor(), EndColor.ToSKColor() };
SKPoint startPoint = new SKPoint(0, 0);
SKPoint endPoint = Horizontal ? new SKPoint(info.Width, 0) : new SKPoint(0, info.Height);
var shader = SKShader.CreateLinearGradient(startPoint, endPoint, colors, null, SKShaderTileMode.Clamp);
SKPaint paint = new SKPaint
{
Style = SKPaintStyle.Fill,
Shader = shader
};
canvas.DrawRect(new SKRect(0, 0, info.Width, info.Height), paint);
}
}
protected override SKShader CreateGradientShader(SKImageInfo info)
{
return(SKShader.CreateLinearGradient(
new SKPoint(0, info.Height / 2),
new SKPoint(info.Width / 2, info.Height / 2),
new SKColor[] { StartColor.ToSKColor(), EndColor.ToSKColor() },
new float[] { 0, 0.5f },
SKShaderTileMode.Mirror));
}
void OnCanvasViewPaintSurface(object sender, SKPaintSurfaceEventArgs args)
{
SKImageInfo info = args.Info;
SKSurface surface = args.Surface;
SKCanvas canvas = surface.Canvas;
canvas.Clear();
var colors = new SKColor[] { StartColor.ToSKColor(), EndColor.ToSKColor()};
SKPoint startPoint = new SKPoint(0,0);
SKPoint endPoint = Horizontal ? new SKPoint(info.Width, 0) : new SKPoint(0, info.Height);
var shader = SKShader.CreateLinearGradient(startPoint, endPoint, colors, null, SKShaderTileMode.Clamp);
SKPaint paint = new SKPaint
{
Style = SKPaintStyle.Fill,
Shader = shader
};
canvas.DrawRect(new SKRect(0, 0, info.Width, info.Height), paint);
}
void OnCanvasViewPaintSurface(object sender, SKPaintSurfaceEventArgs args)
{
SKImageInfo info = args.Info;
SKSurface surface = args.Surface;
SKCanvas canvas = surface.Canvas;
canvas.Clear();
var colors = new SKColor[] { StartColor.ToSKColor(), EndColor.ToSKColor() };
using (SKPaint paint = new SKPaint())
{
// Createrectangle
SKRect rect = new SKRect(0, 0, info.Width, info.Height);
paint.Shader = SKShader.CreateLinearGradient(
new SKPoint(rect.Left, rect.Top),
new SKPoint(rect.Right, rect.Bottom),
colors,
null,
SKShaderTileMode.Clamp);
// Draw the gradient on the rectangle
canvas.DrawRect(rect, paint);
}
// Create linear gradient from upper-left to lower-right
/*SKPoint startPoint = new SKPoint(0, 0);
* SKPoint endPoint = Horizontal ? new SKPoint(info.Width, 0) : new SKPoint(0, info.Height);
*
* var shader = SKShader.CreateLinearGradient(startPoint, endPoint, colors, null, SKShaderTileMode.Clamp);
*
* SKPaint paint = new SKPaint
* {
* Style = SKPaintStyle.Fill,
* Shader = shader
* };
*
* canvas.DrawRect(new SKRect(0, 0, info.Width, info.Height), paint);*/
}
/// <summary>
/// Create the gradient color for the border path
/// If only start or end color is set no gradient will be used.
/// </summary>
private void CreateShader()
{
if (!GradientColor)
{
_paint.Color = StartColor.ToSKColor();
}
else
{
_paint.Shader = SKShader.CreateLinearGradient(
start: new SKPoint(0, 0),
end: new SKPoint(SkCanvasView.CanvasSize.Width, SkCanvasView.CanvasSize.Height),
colors: new SKColor[] {
((Color)StartColor).ToSKColor(),
((Color)EndColor).ToSKColor()
},
colorPos: new float[] { 0, 1 },
mode: SKShaderTileMode.Clamp);
}
}
private void OnCanvasViewPaintSurface(object sender, SKPaintSurfaceEventArgs args)
{
try
{
SKImageInfo info = args.Info;
SKSurface surface = args.Surface;
SKCanvas canvas = surface.Canvas;
canvas.Clear();
var startPoint = new SKPoint(0, 0);
var endPoint = new SKPoint(info.Width, info.Height);
SKColor[] colors;
SKShader shader;
if (HasGradientStartInset)
{
colors = new SKColor[] { StartColor.ToSKColor(), StartColor.ToSKColor(), EndColor.ToSKColor() };
shader = SKShader.CreateLinearGradient(startPoint, endPoint, colors, new float[] { 0, GradientStartInsetPercent, 1 }, SKShaderTileMode.Clamp);
}
else
{
colors = new SKColor[] { StartColor.ToSKColor(), EndColor.ToSKColor() };
shader = SKShader.CreateLinearGradient(startPoint, endPoint, colors, null, SKShaderTileMode.Clamp);
}
var mainPaint = new SKPaint
{
Style = SKPaintStyle.Fill,
Shader = shader
};
canvas.DrawRect(new SKRect(startPoint.X, startPoint.Y, endPoint.X, endPoint.Y), mainPaint);
}
catch (Exception ex)
{
// Don't crash for a pretty effect
System.Diagnostics.Debug.WriteLine(ex);
}
}
protected override void OnPaintSurface(SKPaintSurfaceEventArgs e)
{
base.OnPaintSurface(e);
var canvas = e.Surface.Canvas;
canvas.Clear();
int width = e.Info.Width;
int height = e.Info.Height;
SKPaint backPaint = new SKPaint
{
Style = SKPaintStyle.Fill,
Color = SKColors.WhiteSmoke,
};
canvas.DrawRect(new SKRect(0, 0, width, height), backPaint);
canvas.Save();
canvas.Translate(width / 2, height / 2);
canvas.Scale(Math.Min(width / 210f, height / 520f));
var rect = new SKRect(-100, -100, 100, 100);
// Add a buffer for the rectangle
rect.Inflate(-10, -10);
var bgColorPaint = new SKPaint
{
Color = BGColor.ToSKColor(),
IsAntialias = true,
Style = SKPaintStyle.Fill,
StrokeWidth = 0
};
var barColorPaint = new SKPaint
{
Color = BarColor.ToSKColor(),
IsAntialias = true,
Style = SKPaintStyle.Fill,
StrokeWidth = 0
};
var frameColorPaint = new SKPaint
{
Color = FrameColor.ToSKColor(),
IsAntialias = true,
Style = SKPaintStyle.Stroke,
StrokeWidth = 2
};
var skrect = new SKRect(0, 0, PGWidth, PGHeight);
var skRoundRect = new SKRoundRect(skrect, PGHeight / 2, PGHeight / 2);
canvas.DrawRoundRect(0, 0, PGWidth, PGHeight, PGHeight / 2, PGHeight / 2, bgColorPaint);
canvas.DrawRoundRect(skRoundRect, frameColorPaint);
canvas.ClipRoundRect(skRoundRect, SKClipOperation.Intersect);
if (StartColor != Color.Default && EndColor != Color.Default)
{
barColorPaint.Shader = SKShader.CreateLinearGradient(
new SKPoint(skrect.Left, skrect.Bottom),
new SKPoint(skrect.Right, skrect.Top),
new SKColor[] { StartColor.ToSKColor(), EndColor.ToSKColor() },
new float[] { 0, 1 },
SKShaderTileMode.Repeat);
}
canvas.DrawRoundRect(0, 0, PGWidth * Progress / 100, PGHeight, PGWidth / 2, 0, barColorPaint);
canvas.Restore();
}