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April 10, 2023 11:09
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Bezier demo for DrawBot
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| # See this Twitter thread: | |
| # https://twitter.com/MauriceMeilleur/status/1488347208709718021 | |
| def lerp(v1, v2, t): | |
| return v1 + t * (v2 - v1) | |
| def lerpPoint(p1, p2, t): | |
| return lerp(p1[0], p2[0], t), lerp(p1[1], p2[1], t) | |
| def circle(p, r): | |
| x, y = p | |
| d = r * 2 | |
| oval(x - r, y - r, d, d) | |
| Variable([dict(name="t", ui="Slider", args=dict(minValue=0, value=0, maxValue=1))], globals()) | |
| p1 = (100, 100) | |
| p2 = (256, 662) | |
| p3 = (686, 620) | |
| p4 = (880, 184) | |
| m1 = lerpPoint(p1, p2, t) | |
| m2 = lerpPoint(p2, p3, t) | |
| m3 = lerpPoint(p3, p4, t) | |
| mm1 = lerpPoint(m1, m2, t) | |
| mm2 = lerpPoint(m2, m3, t) | |
| bp = lerpPoint(mm1, mm2, t) | |
| fill(None) | |
| stroke(0.5) | |
| line(p1, p2) | |
| line(p2, p3) | |
| line(p3, p4) | |
| line(m1, m2) | |
| line(m2, m3) | |
| line(mm1, mm2) | |
| stroke(1, 0, 0) | |
| newPath() | |
| moveTo(p1) | |
| curveTo(p2, p3, p4) | |
| drawPath() | |
| fill(0) | |
| stroke(None) | |
| for p in [p1, p2, p3, p4]: | |
| circle(p, 4) | |
| circle(bp, 6) |
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