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Ingy döt Net 2023-07-01 11:58:00 -04:00
parent 7387c8f97b
commit cb5bb5e222
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46
Task/Bitmap-B-zier-curves-Cubic/Python/bitmap-b-zier-curves-cubic.py Normal file
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def cubicbezier(self, x0, y0, x1, y1, x2, y2, x3, y3, n=20):
pts = []
for i in range(n+1):
t = i / n
a = (1. - t)**3
b = 3. * t * (1. - t)**2
c = 3.0 * t**2 * (1.0 - t)
d = t**3
x = int(a * x0 + b * x1 + c * x2 + d * x3)
y = int(a * y0 + b * y1 + c * y2 + d * y3)
pts.append( (x, y) )
for i in range(n):
self.line(pts[i][0], pts[i][1], pts[i+1][0], pts[i+1][1])
Bitmap.cubicbezier = cubicbezier
bitmap = Bitmap(17,17)
bitmap.cubicbezier(16,1, 1,4, 3,16, 15,11)
bitmap.chardisplay()
'''
The origin, 0,0; is the lower left, with x increasing to the right,
and Y increasing upwards.
The chardisplay above produces the following output :
+-----------------+
| |
| |
| |
| |
| @@@@ |
| @@@ @@@ |
| @ |
| @ |
| @ |
| @ |
| @ |
| @ |
| @ |
| @ |
| @@@@ |
| @@@@|
| |
+-----------------+
'''