Initial commit
This commit is contained in:
Florian Festi
commit
a89db65828
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#!/usr/bin/python
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import cairo
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import math
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class Boxes:
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def __init__(self, thickness=3.0):
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self.thickness = thickness
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self.burn = 0.1
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self.fingerJointSettings = (10.0, 10.0)
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self.flexSettings = (1.5, 3.0, 15.0) # line distance, connects, width
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self.output = "box.svg"
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self._init_surface()
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def _init_surface(self):
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width = 300
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height = 200
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self.surface = cairo.SVGSurface(self.output, width, height)
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self.ctx = ctx = cairo.Context(self.surface)
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ctx.translate(0, height)
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ctx.scale(1, -1)
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ctx.set_source_rgb(1.0, 1.0, 1.0)
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ctx.rectangle(0, 0, width, height)
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ctx.fill()
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ctx.set_source_rgb(0.0, 0.0, 0.0)
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ctx.set_line_width(0.1)
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############################################################
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### Turtle graphics commands
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############################################################
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def corner(self, degrees, radius=0):
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d = 1 if (degrees > 0) else -1
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rad = degrees*math.pi/180
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if degrees > 0:
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self.ctx.arc(0, radius+self.burn, radius+self.burn,
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-0.5*math.pi, rad - 0.5*math.pi)
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else:
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self.ctx.arc_negative(0, -(radius+self.burn), radius+self.burn,
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0.5*math.pi, rad + 0.5*math.pi)
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self.continueDirection(degrees)
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def edge(self, length):
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self.ctx.line_to(length, 0)
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self.ctx.translate(*self.ctx.get_current_point())
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def fingerJoint(self, length, positive=True, settings=None):
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# assumes, we are already moved out by self.burn!
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# negative also assumes we are moved out by self.thinkness!
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space, finger = settings or self.fingerJointSettings
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fingers = int((length-space) // (space+finger))
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leftover = length - fingers*(space+finger) - finger
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b = self.burn
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s, f, thickness = space, finger, self.thickness
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if not positive:
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b = -b
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thickness = -thickness
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self.ctx.move_to(0, 0)
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for i in xrange(fingers):
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pos = leftover/2.0+i*(space+finger)
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self.ctx.line_to(pos+s-b, 0)
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self.ctx.line_to(pos+s-b, -thickness)
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self.ctx.line_to(pos+s+f+b, -thickness)
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self.ctx.line_to(pos+s+f+b, 0)
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self.ctx.line_to(length, 0)
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self.ctx.translate(*self.ctx.get_current_point())
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def fingerHoles(self, length, settings=None):
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space, finger = settings or self.fingerJointSettings
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fingers = int((length-space) // (space+finger))
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leftover = length - fingers*(space+finger) - finger
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b = self.burn
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s, f = space, finger
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for i in xrange(fingers):
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pos = leftover/2.0+i*(space+finger)
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self.ctx.rectangle(pos+s+b, self.thickness/2-b,
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f-2*b, self.thickness - 2*b)
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self.ctx.move_to(0, length)
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self.ctx.translate(*self.ctx.get_current_point())
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def fingerHoleEdge(self, length, dist, settings=None):
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self.ctx.save()
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self.moveTo(0, dist+self.thickness/2)
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self.fingerHoles(length, settings)
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self.ctx.restore()
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# XXX continue path
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self.ctx.move_to(0, 0)
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self.ctx.line_to(length, 0)
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self.ctx.translate(*self.ctx.get_current_point())
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def flex(self, x, h, settings=None):
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dist, connection, width = settings or self.flexSettings
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lines = int(x // dist)
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leftover = x - lines * dist
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sections = int((h-connection) // width)
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sheight = ((h-connection) / sections)-connection
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for i in xrange(lines):
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pos = i*dist + leftover/2
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if i % 2:
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self.ctx.move_to(pos, 0)
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self.ctx.line_to(pos, connection+sheight)
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for j in range((sections-1)/2):
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self.ctx.move_to(pos, (2*j+1)* sheight+ (2*j+2)*connection)
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self.ctx.line_to(pos, (2*j+3)* (sheight+ connection))
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if not sections % 2:
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self.ctx.move_to(pos, h - sheight- 2*connection)
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self.ctx.line_to(pos, h)
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else:
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if sections % 2:
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self.ctx.move_to(pos, h)
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self.ctx.line_to(pos, h-connection-sheight)
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for j in range((sections-1)/2):
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self.ctx.move_to(
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pos, h-((2*j+1)* sheight+ (2*j+2)*connection))
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self.ctx.line_to(
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pos, h-(2*j+3)* (sheight+ connection))
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else:
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for j in range(sections/2):
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self.ctx.move_to(pos,
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h-connection-2*j*(sheight+connection))
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self.ctx.line_to(pos, h-2*(j+1)*(sheight+connection))
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self.ctx.move_to(0, 0)
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self.ctx.line_to(x, 0)
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self.ctx.translate(*self.ctx.get_current_point())
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### Navigation
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def moveTo(self, x, y, degrees=0):
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self.ctx.translate(x, y)
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self.ctx.rotate(degrees*math.pi/180.0)
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self.ctx.move_to(0, 0)
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def continueDirection(self, degrees):
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self.ctx.translate(*self.ctx.get_current_point())
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self.ctx.rotate(degrees*math.pi/180.0)
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####################################################################
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### Parts
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####################################################################
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def basePlate(self, x=100, y=100, r=0):
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self.ctx.save()
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self.moveTo(r, 0)
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for i in range(2):
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self.fingerJoint(x-2*r)
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self.corner(90, r)
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self.fingerJoint(y-2*r)
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self.corner(90, r)
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self.ctx.restore()
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def wall(self, x=100, y=100, h=100, r=0):
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self.ctx.save()
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self.moveTo(r, 0)
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c4 = (r+self.burn)*math.pi*0.5 # circumference of quarter circle
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for i in range(2):
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self.fingerJoint(x-2*r, positive=False)
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#self.fingerHoleEdge(x-2*r, 5)
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self.flex(c4, h)
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#self.fingerJoint(y-2*r, positive=False)
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self.fingerHoleEdge(y-2*r, 5)
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self.flex(c4, h)
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self.corner(90)
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self.edge(h)
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self.corner(90)
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self.edge(2*(x+y-4*r)+4*c4)
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self.corner(90)
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self.edge(h)
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self.corner(90)
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self.ctx.restore()
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##################################################
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### main
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##################################################
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def render(self, x, y, r):
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self.moveTo(20,20)
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self.basePlate(x, y, r)
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self.moveTo(0, y+20)
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self.wall(x, y, 120, r)
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self.ctx.stroke()
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self.surface.flush()
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if __name__ == '__main__':
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b = Boxes()
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b.render(200, 150, 30)
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