Class Curve
A cubic Bézier curve.
For details on Bézier curves, see Bézier curves on Wikipedia.
Tables
| Curve.x0 | x coordinate of curve point P0 |
| Curve.y0 | y coordinate of curve point P0 |
| Curve.cp1x | x coordinate of first control point P1 |
| Curve.cp1y | y coordinate of first control point P1 |
| Curve.cp2x | x coordinate of second control point P2 |
| Curve.cp2y | y coordinate of second control point P2 |
| Curve.x | x coordinate of curve point P3 |
| Curve.y | y coordinate of curve point P3 |
| Curve.p | table of curve points. |
Methods
| Curve:remove () | Remove curve from subpath. |
| Curve:split (t) | Split curve into two curves. |
Tables
- Curve.x0
- x coordinate of curve point P0
- Curve.y0
- y coordinate of curve point P0
- Curve.cp1x
-
x coordinate of first control point P1
Usage:
graphics.paths[1].subpaths[1].curves[1].cp1x = 10
- Curve.cp1y
-
y coordinate of first control point P1
Usage:
print(graphics.paths[1].subpaths[1].curves[1].cp1y)
- Curve.cp2x
- x coordinate of second control point P2
- Curve.cp2y
- y coordinate of second control point P2
- Curve.x
- x coordinate of curve point P3
- Curve.y
- y coordinate of curve point P3
- Curve.p
-
table of curve points.
Use this to access points in a curve by index.
Note that for consistency with Lua, the indices here
are one-based, even though traditional Bézier terminology
is 0-based. So keep in mind that
P0 =
p[1], P1 =p[2], P2 =p[3], P3 =p[4].Usage:
print(graphics.paths[1].subpaths[1].curves[1].p[1].x) -- get P0.x graphics.paths[1].subpaths[1].curves[1].p[4].y = 7 -- set P3.y