Name | bezierTangent() |
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Examples |
noFill() bezier(85, 20, 10, 10, 90, 90, 15, 80) steps = 6 fill(255) for i in range(steps + 1): t = i / float(steps) # Get the location of the point x = bezierPoint(85, 10, 90, 15, t) y = bezierPoint(20, 10, 90, 80, t) # Get the tangent points tx = bezierTangent(85, 10, 90, 15, t) ty = bezierTangent(20, 10, 90, 80, t) # Calculate an angle from the tangent points a = atan2(ty, tx) a += PI stroke(255, 102, 0) line(x, y, cos(a)*30 + x, sin(a)*30 + y) # The following line of code makes a line # inverse of the above line #line(x, y, cos(a)*-30 + x, sin(a)*-30 + y) stroke(0) ellipse(x, y, 5, 5) noFill() bezier(85, 20, 10, 10, 90, 90, 15, 80) stroke(255, 102, 0) steps = 16 for i in range(steps + 1): t = i / float(steps) x = bezierPoint(85, 10, 90, 15, t) y = bezierPoint(20, 10, 90, 80, t) tx = bezierTangent(85, 10, 90, 15, t) ty = bezierTangent(20, 10, 90, 80, t) a = atan2(ty, tx) a -= HALF_PI line(x, y, cos(a)*8 + x, sin(a)*8 + y) | ||||||||||
Description | Calculates the tangent of a point on a Bezier curve. There is a good definition of tangent on Wikipedia. | ||||||||||
Syntax | bezierTangent(a, b, c, d, t) | ||||||||||
Parameters |
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Related |
bezier() bezierVertex() curvePoint() |
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