private void DrawPathWithXRenderCompositeTriStrip(Color color, int width, Point[] points)
{
if (width == 0)
{
width = 1;
}
XRenderColor xColor = new XRenderColor(color);
// todo: cache brush
ulong brush = LibXRender.XRenderCreateSolidFill(display, ref xColor);
try
{
XPointFixed[] stripPoints = new XPointFixed[(points.Length - 1) * 3 + 1];
for (int i = 1, t = 0, m = 1; i < points.Length; i++, m = -m)
{
Point p1 = points[i - 1];
Point p2 = points[i];
p1.Offset(-origin.X, -origin.Y);
p2.Offset(-origin.X, -origin.Y);
int dx = p2.X - p1.X;
int dy = p2.Y - p1.Y;
double len = Math.Sqrt(Math.Pow(dx, 2) + Math.Pow(dy, 2));
// todo: handle 0 points and zero-length segments
int ox = Convert.ToInt32(-dy / len * 32768 * width) * m;
int oy = Convert.ToInt32(dx / len * 32768 * width) * m;
if (i == 1)
{
// todo: handle separately without if
stripPoints[t++] = new XPointFixed {
x = (p1.X << 16) + ox, y = (p1.Y << 16) + oy
};
}
stripPoints[t++] = new XPointFixed {
x = (p1.X << 16) - ox, y = (p1.Y << 16) - oy
};
stripPoints[t++] = new XPointFixed {
x = (p2.X << 16) + ox, y = (p2.Y << 16) + oy
};
stripPoints[t++] = new XPointFixed {
x = (p2.X << 16) - ox, y = (p2.Y << 16) - oy
};
}
LibXRender.XRenderCompositeTriStrip(display, PictOp.PictOpOver, brush, pictureId, pictFormatPtr, 0, 0, stripPoints, stripPoints.Length);
}
finally
{
LibXRender.XRenderFreePicture(display, brush);
}
}
private void DrawPathWithXRenderCompositeDoublePoly(Color color, int width, Point[] points)
{
if (width == 0)
{
width = 1;
}
XRenderColor xColor = new XRenderColor(color);
// todo: cache brush
ulong brush = LibXRender.XRenderCreateSolidFill(display, ref xColor);
try
{
XPointDouble[] polyPoints = new XPointDouble[points.Length * 2];
for (int i = 1, t = polyPoints.Length - 2; i < points.Length; i++, t--)
{
Point p1 = points[i - 1];
Point p2 = points[i];
p1.Offset(-origin.X, -origin.Y);
p2.Offset(-origin.X, -origin.Y);
int dx = p2.X - p1.X;
int dy = p2.Y - p1.Y;
double len = Math.Sqrt(Math.Pow(dx, 2) + Math.Pow(dy, 2));
double ox = -dy / len * width / 2;
double oy = dx / len * width / 2;
polyPoints[i] = new XPointDouble {
x = points[i].X + ox, y = points[i].Y + oy
};
polyPoints[t] = new XPointDouble {
x = points[i].X - ox, y = points[i].Y - oy
};
if (i == 1)
{
// todo: handle separately without if
polyPoints[0] = new XPointDouble {
x = points[0].X + ox, y = points[0].Y + oy
};
polyPoints[polyPoints.Length - 1] = new XPointDouble {
x = points[0].X - ox, y = points[0].Y - oy
};
}
}
LibXRender.XRenderCompositeDoublePoly(display, PictOp.PictOpOver, brush, pictureId, pictFormatPtr, 0, 0, 0, 0, polyPoints, polyPoints.Length, 1);
}
finally
{
LibXRender.XRenderFreePicture(display, brush);
}
}