public void Dispose()
{
if (canvas != null)
{
canvas.RestoreToCount(saveCount);
}
}
/// <summary>
/// Perform the restore now, instead of waiting for the Dispose.
/// Will only do this once.
/// </summary>
public void Restore()
{
if (canvas != null)
{
canvas.RestoreToCount(saveCount);
canvas = null;
}
}
private SKPoint DrawLineArrowInternal(SKCanvas canvas, SKPaint pen, SKPaint brush, float x, float y, double angle, ArrowStyle style)
{
SKPoint pt = default(SKPoint);
var rt = MatrixHelper.Rotation(angle, new SKPoint(x, y));
double rx = style.RadiusX;
double ry = style.RadiusY;
double sx = 2.0 * rx;
double sy = 2.0 * ry;
switch (style.ArrowType)
{
default:
case ArrowType.None:
{
pt = new SKPoint(x, y);
}
break;
case ArrowType.Rectangle:
{
pt = MatrixHelper.TransformPoint(rt, new SKPoint(x - (float)sx, y));
var rect = ToSKRect(x - sx, y - ry, sx, sy);
int count = canvas.Save();
canvas.SetMatrix(rt);
DrawRectangleInternal(canvas, brush, pen, style.IsStroked, style.IsFilled, ref rect);
canvas.RestoreToCount(count);
}
break;
case ArrowType.Ellipse:
{
pt = MatrixHelper.TransformPoint(rt, new SKPoint(x - (float)sx, y));
int count = canvas.Save();
canvas.SetMatrix(rt);
var rect = ToSKRect(x - sx, y - ry, sx, sy);
DrawEllipseInternal(canvas, brush, pen, style.IsStroked, style.IsFilled, ref rect);
canvas.RestoreToCount(count);
}
break;
case ArrowType.Arrow:
{
var pts = new SKPoint[]
{
new SKPoint(x, y),
new SKPoint(x - (float)sx, y + (float)sy),
new SKPoint(x, y),
new SKPoint(x - (float)sx, y - (float)sy),
new SKPoint(x, y)
};
pt = MatrixHelper.TransformPoint(rt, pts[0]);
var p11 = MatrixHelper.TransformPoint(rt, pts[1]);
var p21 = MatrixHelper.TransformPoint(rt, pts[2]);
var p12 = MatrixHelper.TransformPoint(rt, pts[3]);
var p22 = MatrixHelper.TransformPoint(rt, pts[4]);
DrawLineInternal(canvas, pen, style.IsStroked, ref p11, ref p21);
DrawLineInternal(canvas, pen, style.IsStroked, ref p12, ref p22);
}
break;
}
return pt;
}
