protected override void Draw(SKCanvas canvas, int width, int height)
{
float time = _frame / (LengthSec * Fps);
using (var paint = new SKPaint())
{
paint.Color = Foreground.ToSkia();
paint.StrokeWidth = (float)StrokeWidth;
paint.IsAntialias = true;
paint.IsStroke = true;
for (int a = 0; a < 3; ++a)
{
var matrix = SKMatrix.MakeRotation(2 * (float)Math.PI * time / 6 + 2 * (float)Math.PI * a / 3);
matrix.TransX = width / 2f;
matrix.TransY = height / 2f;
canvas.SetMatrix(matrix);
const int n = 12;
const int sp = 39;
for (int i = -n; i <= n; ++i)
{
float y = (float)(i * sp * Math.Pow(2, time));
float tt = (float)Math.Min(1, Math.Max(0, 1.09 * time - 0.00275 * Math.Abs(y) + 0.075));
float x;
if (i % 2 == 0)
x = width;
else
x = width * tt;
if (x > 0)
canvas.DrawLine(-x, y, x, y, paint);
}
}
}
++_frame;
if (_frame > LengthSec * Fps)
_frame = 0;
}
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;
}
