protected virtual void InternalDraw(SKCanvas canvas)
{
using (var paint = new SKPaint())
{
if (BackgroundColor.A > 0)
{
paint.Color = BackgroundColor.ToSKColor();
canvas.DrawRect(RenderBounds.ToSKRect(), paint);
}
if (FrameColor.A > 0)
{
paint.Color = FrameColor.ToSKColor();
paint.IsStroke = true;
paint.StrokeWidth = (float)FrameThickness;
canvas.DrawRect(RenderBounds.ToSKRect(), paint);
}
}
if (Drawing != null)
{
Drawing(canvas);
}
}
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();
}
protected void DrawVerticalLabels(SKCanvas canvas, SKRect frame, SKRect chart)
{
using (var paint = new SKPaint
{
TextSize = VerticalLabelTextSize,
Color = this.VerticalLabelColor.ToSKColor(),
IsAntialias = true
})
{
// Calculates maximum value depending on chart height
var maximumValue = chart.Height * (MaxValue / chart.Height);
if (VerticalLabelMode != LabelMode.None)
{
// Draw vertical unit
if (!string.IsNullOrEmpty(VerticalUnit))
{
// Draws maximum value
canvas.DrawText(this.VerticalUnit, ChartRectMargin.Left, frame.Top + VerticalLabelTextSize, paint);
canvas.DrawText(maximumValue.ToString(), ChartRectMargin.Left, frame.Top + (VerticalLabelTextSize * 2), paint);
}
else
{
// Draws maximum value
canvas.DrawText(maximumValue.ToString(), ChartRectMargin.Left, frame.Top + VerticalLabelTextSize, paint);
}
canvas.DrawText("0", ChartRectMargin.Left, frame.Bottom, paint);
}
if (VerticalLabelMode == LabelMode.StartCenterEnd || VerticalLabelMode == LabelMode.All)
{
using (var framePaint = new SKPaint
{
Style = SKPaintStyle.Stroke,
Color = FrameColor.ToSKColor(),
StrokeWidth = FrameWidth / 2,
})
{
if (DashedFrame)
{
framePaint.PathEffect = SKPathEffect.CreateDash(new float[] { 12, 12 }, 0);
}
if (HideFrame)
{
canvas.DrawLine(frame.Left, string.IsNullOrEmpty(VerticalUnit) ? frame.Top + (VerticalLabelTextSize / 2) : frame.Top + VerticalLabelTextSize, frame.Right, string.IsNullOrEmpty(VerticalUnit) ? frame.Top + (VerticalLabelTextSize / 2) : frame.Top + VerticalLabelTextSize, framePaint);
canvas.DrawLine(frame.Left, frame.Bottom - (VerticalLabelTextSize / 4), frame.Right, frame.Bottom - (VerticalLabelTextSize / 4), framePaint);
}
canvas.DrawText((maximumValue / 2).ToString(), ChartRectMargin.Left, frame.MidY + (VerticalLabelTextSize / 4), paint);
canvas.DrawLine(frame.Left, frame.MidY, frame.Right, frame.MidY, framePaint);
if (VerticalLabelMode == LabelMode.All)
{
canvas.DrawText((maximumValue * .25).ToString(), ChartRectMargin.Left, (frame.Height * .75f) + (VerticalLabelTextSize / 4), paint);
canvas.DrawText((maximumValue * .75).ToString(), ChartRectMargin.Left, (frame.Height * .25f) + (VerticalLabelTextSize / 4), paint);
canvas.DrawLine(frame.Left, frame.Height * .75f, frame.Right, frame.Height * .75f, framePaint);
canvas.DrawLine(frame.Left, frame.Height * .25f, frame.Right, frame.Height * .25f, framePaint);
}
}
}
}
}