Constructs a Bezier curve element
- x1 (Single)
- The first point X coordinate
- y1 (Single)
- The first point Y coordinate
- x2 (Single)
- The second point X coordinate
- y2 (Single)
- The second point Y coordinate
- x3 (Single)
- The third point X coordinate
- y3 (Single)
- The third point Y coordinate
- x4 (Single)
- The fourth point X coordinate
- y4 (Single)
- The fourth point Y coordinate