Module draw2D
Draw2D: simple drawing primitives for 2D graphics
Functions
| push () | Store the current transformation until the next pop() Caches the current transform matrix into the matrix stack, and pushes a new copy of the matrix onto the top. |
| pop () | Restore the transformation from the previous push() Discards the current transformation matrix and restores the previous matrix from the matrix stack. |
| translate (x, y) | Move the coordinate system origin to x, y (modifies the transformation matrix) |
| scale (x, y) | Scale the coordinate system (modifies the transformation matrix) |
| rotate (a) | Rotate the coordinate system around the origin (modifies the transformation matrix) |
| point (x, y) | Draw a point at position x,y |
| line (x1, y1, x2, y2) | Draw a line from x1,y1 to x2,y2 |
| rect (x, y, w, h) | Draw a rectangle at the point (x, y) with width w and height h |
| ellipse (x, y, w, h) | Draw an ellipse at the point (x, y) with horizontal diameter w and vertical diameter h |
| circle (x, y, d) | Draw an ellipse at the point (x, y) with horizontal diameter d |
| arc (x, y, s, e, w, h) | Draw an arc at the point (x, y) with horizontal diameter d |
| color (red, green, blue, alpha) | Set the rendering color |
Functions
- push ()
- Store the current transformation until the next pop() Caches the current transform matrix into the matrix stack, and pushes a new copy of the matrix onto the top. Note that the stack is limited in size (typically 32 items).
- pop ()
- Restore the transformation from the previous push() Discards the current transformation matrix and restores the previous matrix from the matrix stack.
- translate (x, y)
-
Move the coordinate system origin to x, y
(modifies the transformation matrix)
Parameters:
- x coordinate of new origin
- y coordinate of new origin
- scale (x, y)
-
Scale the coordinate system
(modifies the transformation matrix)
Parameters:
- x horizontal factor
- y vertical factor
- rotate (a)
-
Rotate the coordinate system around the origin
(modifies the transformation matrix)
Parameters:
- a the angle (in radians) to rotate
- point (x, y)
-
Draw a point at position x,y
Parameters:
- x coordinate of center (optional, defaults to 0)
- y coordinate of center (optional, defaults to 0)
- line (x1, y1, x2, y2)
-
Draw a line from x1,y1 to x2,y2
Parameters:
- x1 start coordinate
- y1 start coordinate
- x2 end coordinate (optional, defaults to 0)
- y2 end coordinate (optional, defaults to 0)
- rect (x, y, w, h)
-
Draw a rectangle at the point (x, y) with width w and height h
Parameters:
- x coordinate of center (optional, defaults to 0)
- y coordinate of center (optional, defaults to 0)
- w width (optional, defaults to 1)
- h height (optional, defaults to 1)
- ellipse (x, y, w, h)
-
Draw an ellipse at the point (x, y) with horizontal diameter w and vertical diameter h
Parameters:
- x coordinate of center (optional, defaults to 0)
- y coordinate of center (optional, defaults to 0)
- w horizontal diameter (optional, defaults to 1)
- h vertical diameter (optional, defaults to w)
- circle (x, y, d)
-
Draw an ellipse at the point (x, y) with horizontal diameter d
Parameters:
- x coordinate of center (optional, defaults to 0)
- y coordinate of center (optional, defaults to 0)
- d diameter (optional, defaults to 1)
- arc (x, y, s, e, w, h)
-
Draw an arc at the point (x, y) with horizontal diameter d
Parameters:
- x coordinate of center (optional, defaults to 0)
- y coordinate of center (optional, defaults to 0)
- s start angle (optional, defaults to -pi/2)
- e end angle (optional, defaults to pi/2)
- w horizontal radius (optional, defaults to 1)
- h vertical radius (optional, defaults to w)
- color (red, green, blue, alpha)
-
Set the rendering color
Parameters:
- red value from 0 to 1 (optional, default 0)
- green value from 0 to 1 (optional, default 0)
- blue value from 0 to 1 (optional, default 0)
- alpha (opacity) value from 0 to 1 (optional, default 1)