kopia lustrzana https://github.com/villares/sketch-a-day
125 wiersze
3.5 KiB
Python
125 wiersze
3.5 KiB
Python
# Alexandre B A Villares - https://abav.lugaralgum.com/sketch-a-day
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SKETCH_NAME, OUTPUT = "sketch_190216a", ".png"
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"""
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A rounded polygon with variable radius
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"""
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p_list = [PVector(100, 400, 50),
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PVector(300, 100, 100),]
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radius = 30
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def setup():
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size(500, 500)
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def draw():
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background(200)
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p_list.append(PVector(mouseX, mouseY, radius))
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for p0, p1, p2 in zip(p_list,
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[p_list[-1]]+ p_list[:-1],
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[p_list[-2]]+ [p_list[-1]]+ p_list[:-2]):
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m1 = (p0 + p1)/2
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m2 = (p1+ p2)/2
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strokeWeight(1)
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stroke(0)
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line(p1.x, p1.y, m1.x, m1.y)
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line(p1.x, p1.y, m2.x, m2.y)
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stroke(255)
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strokeWeight(3)
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roundedCorner(p1, m1, m2, p1.z)
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p_list.pop()
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def roundedCorner(pc, p1, p2, r):
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"""
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Based on Stackoverflow C# rounded corner post
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https://stackoverflow.com/questions/24771828/algorithm-for-creating-rounded-corners-in-a-polygon
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"""
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#Vector 1
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dx1 = pc.x - p1.x
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dy1 = pc.y - p1.y
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#Vector 2
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dx2 = pc.x - p2.x
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dy2 = pc.y - p2.y
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#Angle between vector 1 and vector 2 divided by 2
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angle = (atan2(dy1, dx1) - atan2(dy2, dx2)) / 2
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# The length of segment between angular point and the
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# points of intersection with the circle of a given radius
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tng = abs(tan(angle))
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segment = r / tng if tng !=0 else r
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#Check the segment
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length1 = GetLength(dx1, dy1)
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length2 = GetLength(dx2, dy2)
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min_len = min(length1, length2)
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if segment > min_len:
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segment = min_len
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r = min_len * abs(tan(angle))
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# Points of intersection are calculated by the proportion between
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# the coordinates of the vector, length of vector and the length of the segment.
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p1Cross = GetProportionPoint(pc, segment, length1, dx1, dy1)
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p2Cross = GetProportionPoint(pc, segment, length2, dx2, dy2)
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# Calculation of the coordinates of the circle
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# center by the addition of angular vectors.
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dx = pc.x * 2 - p1Cross.x - p2Cross.x
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dy = pc.y * 2 - p1Cross.y - p2Cross.y
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L = GetLength(dx, dy)
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d = GetLength(segment, r)
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circlePoint = GetProportionPoint(pc, d, L, dx, dy)
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#StartAngle and EndAngle of arc
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startAngle = atan2(p1Cross.y - circlePoint.y, p1Cross.x - circlePoint.x)
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endAngle = atan2(p2Cross.y - circlePoint.y, p2Cross.x - circlePoint.x)
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#Sweep angle
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sweepAngle = endAngle - startAngle
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#Some additional checks
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if sweepAngle < 0:
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startAngle, endAngle = endAngle, startAngle
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sweepAngle = -sweepAngle
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if sweepAngle > PI:
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startAngle, endAngle = endAngle, startAngle
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sweepAngle = TWO_PI - sweepAngle
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#Draw result using graphics
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noFill()
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line(p1.x, p1.y, p1Cross.x, p1Cross.y)
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line(p2.x, p2.y, p2Cross.x, p2Cross.y)
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arc(circlePoint.x, circlePoint.y, 2 * r, 2 * r,
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startAngle, startAngle + sweepAngle)
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fill(0, 0, 100)
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text(str(int(r))+" "+str(int(pc.z))
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, circlePoint.x, circlePoint.y )
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def GetLength(dx, dy):
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return sqrt(dx * dx + dy * dy)
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def GetProportionPoint(pt, segment, L, dx, dy):
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# factor = segment / L if L != 0 else 0
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factor = float(segment) / L if L != 0 else segment
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return PVector(
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(pt.x - dx * factor),
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(pt.y - dy * factor))
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def mousePressed():
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if mouseButton == LEFT:
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p_list.append(PVector(mouseX, mouseY, radius))
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elif len(p_list) > 2:
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p_list.pop()
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def mouseWheel(e):
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global radius
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radius += int(e.getAmount())
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