Triangle
Categories: generativepy generative art
The Triangle class draws a triangle.
There is also a triangle function that just creates a triangle as a new path.
Triangle class methods
The Triangle class inherits add, fill, stroke, fill_stroke, path, clip and other methods from Shape.
It has additional methods:
- of_corners
of_corners
Creates a triangle based on a set of 3 points.
of_corners(a, b, c)
| Parameter | Type | Description |
|---|---|---|
| a | (number, number) | (x, y) tuple, giving the position of corner a of the triangle. |
| b | (number, number) | (x, y) tuple, giving the position of corner b of the triangle. |
| c | (number, number) | (x, y) tuple, giving the position of corner c of the triangle. |
triangle function
Adds a triangle as a new path, without the need to create a Triangle object in code.
triangle(ctx, points)
| Parameter | Type | Description |
|---|---|---|
| ctx | Context | The Pycairo Context to draw to |
| a | (number, number) | (x, y) tuple, giving the position of corner a of the triangle. |
| b | (number, number) | (x, y) tuple, giving the position of corner b of the triangle. |
| c | (number, number) | (x, y) tuple, giving the position of corner c of the triangle. |
Example
Here is some example code that draws triangles using the class and the utility function. The full code can be found on github.
from generativepy.drawing import make_image, setup
from generativepy.color import Color
from generativepy.geometry import triangle, Triangle
'''
Create triangles using the geometry module.
'''
def draw(ctx, width, height, frame_no, frame_count):
setup(ctx, width, height, width=500, background=Color(0.8))
# The triangle function is a convenience function that adds a triangle as a new path.
# You can fill or stroke it as you wish.
triangle(ctx, (100, 100), (150, 50), (200, 150))
ctx.set_source_rgba(*Color(1, 0, 0))
ctx.fill()
Triangle(ctx).of_corners((300, 100), (300, 150), (400, 200)).stroke(Color('orange'), 10)
make_image("/tmp/geometry-triangle.png", draw, 500, 500)
See also
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