private bool DrawTriangle(CanvasContext2D ctx, ImageElement im, double x0, double y0, double x1, double y1, double x2, double y2,
double sx0, double sy0, double sx1, double sy1, double sx2, double sy2)
{
bool inside;
if (factor == 1.0)
{
inside = Intersects(0, Width, 0, Height, x0, y0, x1, y1, x2, y2);
}
else
{
hw = Width / 2;
qw = hw * factor;
hh = Height / 2;
qh = hh * factor;
inside = Intersects(hw - qw, hw + qw, hh - qh, hh + qh, x0, y0, x1, y1, x2, y2);
}
if (!inside)
{
return false;
}
double edgeOffset = isOutlined ? ContractionInPixels : ExpansionInPixels;
Vector2d expandedS0 = GetMiterPoint(Vector2d.Create(x0, y0), Vector2d.Create(x1, y1), Vector2d.Create(x2, y2), edgeOffset);
Vector2d expandedS1 = GetMiterPoint(Vector2d.Create(x1, y1), Vector2d.Create(x0, y0), Vector2d.Create(x2, y2), edgeOffset);
Vector2d expandedS2 = GetMiterPoint(Vector2d.Create(x2, y2), Vector2d.Create(x1, y1), Vector2d.Create(x0, y0), edgeOffset);
x0 = expandedS0.X;
y0 = expandedS0.Y;
x1 = expandedS1.X;
y1 = expandedS1.Y;
x2 = expandedS2.X;
y2 = expandedS2.Y;
ctx.Save();
ctx.BeginPath();
ctx.MoveTo(x0, y0);
ctx.LineTo(x1, y1);
ctx.LineTo(x2, y2);
ctx.ClosePath();
ctx.Clip();
double denom = sx0 * (sy2 - sy1) - sx1 * sy2 + sx2 * sy1 + (sx1 - sx2) * sy0;
if (denom == 0)
{
ctx.Restore();
return false;
}
double m11 = -(sy0 * (x2 - x1) - sy1 * x2 + sy2 * x1 + (sy1 - sy2) * x0) / denom;
double m12 = (sy1 * y2 + sy0 * (y1 - y2) - sy2 * y1 + (sy2 - sy1) * y0) / denom;
double m21 = (sx0 * (x2 - x1) - sx1 * x2 + sx2 * x1 + (sx1 - sx2) * x0) / denom;
double m22 = -(sx1 * y2 + sx0 * (y1 - y2) - sx2 * y1 + (sx2 - sx1) * y0) / denom;
double dx = (sx0 * (sy2 * x1 - sy1 * x2) + sy0 * (sx1 * x2 - sx2 * x1) + (sx2 * sy1 - sx1 * sy2) * x0) / denom;
double dy = (sx0 * (sy2 * y1 - sy1 * y2) + sy0 * (sx1 * y2 - sx2 * y1) + (sx2 * sy1 - sx1 * sy2) * y0) / denom;
ctx.Transform(m11, m12, m21, m22, dx, dy);
ctx.DrawImage(im, 0, 0);
ctx.Restore();
if (factor != 1.0)
{
ctx.BeginPath();
ctx.MoveTo(hw - qw, hh - qh);
ctx.LineTo(hw + qw, hh - qh);
ctx.LineTo(hw + qw, hh + qh);
ctx.LineTo(hw - qw, hh + qh);
ctx.ClosePath();
ctx.StrokeStyle = "yellow";
ctx.Stroke();
}
return true;
}
private bool DrawTriangle(CanvasContext2D ctx, ImageElement im, double x0, double y0, double x1, double y1, double x2, double y2,
double sx0, double sy0, double sx1, double sy1, double sx2, double sy2)
{
if (!Intersects(0, Width, 0, Height, x0, y0, x1, y1, x2, y2))
{
return false;
}
//double edgeOffset = isOutlined ? ContractionInPixels : ExpansionInPixels;
//Vector2d expandedS0 = GetMiterPoint(Vector2d.Create(x0, y0), Vector2d.Create(x1, y1), Vector2d.Create(x2, y2), ExpansionInPixels);
//Vector2d expandedS1 = GetMiterPoint(Vector2d.Create(x1, y1), Vector2d.Create(x0, y0), Vector2d.Create(x2, y2), ExpansionInPixels);
//Vector2d expandedS2 = GetMiterPoint(Vector2d.Create(x2, y2), Vector2d.Create(x1, y1), Vector2d.Create(x0, y0), ExpansionInPixels);
//Vector2d expandedS0 = MiterPoint(x0, y0, x1, y1, x2, y2);
//Vector2d expandedS1 = MiterPoint(x1, y1, x0, y0, x2, y2);
//Vector2d expandedS2 = MiterPoint(x2, y2, x1, y1, x0, y0);
MiterPointOut(expandedS0, x0, y0, x1, y1, x2, y2, ExpansionInPixels);
MiterPointOut(expandedS1, x1, y1, x0, y0, x2, y2, ExpansionInPixels);
MiterPointOut(expandedS2, x2, y2, x1, y1, x0, y0, ExpansionInPixels);
x0 = expandedS0.X;
y0 = expandedS0.Y;
x1 = expandedS1.X;
y1 = expandedS1.Y;
x2 = expandedS2.X;
y2 = expandedS2.Y;
ctx.Save();
if (RenderingOn)
{
ctx.BeginPath();
ctx.MoveTo(x0, y0);
ctx.LineTo(x1, y1);
ctx.LineTo(x2, y2);
ctx.ClosePath();
ctx.Clip();
}
double denom = sx0 * (sy2 - sy1) - sx1 * sy2 + sx2 * sy1 + (sx1 - sx2) * sy0;
//if (denom == 0)
//{
// ctx.Restore();
// return false;
//}
double m11 = -(sy0 * (x2 - x1) - sy1 * x2 + sy2 * x1 + (sy1 - sy2) * x0) / denom;
double m12 = (sy1 * y2 + sy0 * (y1 - y2) - sy2 * y1 + (sy2 - sy1) * y0) / denom;
double m21 = (sx0 * (x2 - x1) - sx1 * x2 + sx2 * x1 + (sx1 - sx2) * x0) / denom;
double m22 = -(sx1 * y2 + sx0 * (y1 - y2) - sx2 * y1 + (sx2 - sx1) * y0) / denom;
double dx = (sx0 * (sy2 * x1 - sy1 * x2) + sy0 * (sx1 * x2 - sx2 * x1) + (sx2 * sy1 - sx1 * sy2) * x0) / denom;
double dy = (sx0 * (sy2 * y1 - sy1 * y2) + sy0 * (sx1 * y2 - sx2 * y1) + (sx2 * sy1 - sx1 * sy2) * y0) / denom;
ctx.Transform(m11, m12, m21, m22, dx, dy);
if (RenderingOn)
{
ctx.Alpha = Opacity;
if (lighting < 1.0)
{
ctx.Alpha = 1;
ctx.FillStyle = "Black";
ctx.FillRect(0, 0, Width, Height);
ctx.Alpha = lighting * Opacity;
}
ctx.DrawImage(im, 0, 0);
}
ctx.Restore();
return true;
}