On Sun, May 17, 2009 at 6:35 AM, Gregor Lingl <gregor.li...@aon.at> wrote: > kirby urner schrieb >> >> For those of you looking for a way cool use of Python's ReportLab, I >> so far have permission to release this one example "PDF flipbook" >> showing how geometry concepts might be communicated using this simple >> animation technique: >> >> http://www.4dsolutions.net/presentations/pdf_animation_by_ron_resch.pdf
Yes, the Python version below works much better for me. I'm not up for clicking 1264 times to view the PDF. > Very impressive and instructive! Is there a description somewhere, how > 'flipbooks' like these > can be produced? > > With me this way of communicating geometry concepts worked rather well, as > you can see in the > attachment. > > Regards, > Gregor >> >> I've been sharing this as a teaser with Software Association of Oregon >> as well, knowing Ron has a lot more where that came from (I'm suppose >> to download a half-gig PDF next time in Pauling House for a bored er >> board meeting). >> >> Kirby > > # uses turtle module from Python 2.6 > # hint from Kirby, 15. 5. 09 > # http://www.4dsolutions.net/presentations/pdf_animation_by_ron_resch.pdf > > from turtle import Turtle, Screen, Vec2D, mainloop > import math > > A = 50. # adjust this to your needs > > SHS = A / 20 > SF = 1.0 > DSF = 1.0038582416 > e = Vec2D(3**.5/2, 0.5) > > def dsin(angle): > return math.sin(angle*math.pi/180) > > def lines(l): > for i in range(6): > d.fd(l) > d.bk(l) > d.left(60) > > class TriTurtle(Turtle): > def __init__(self, c, r, tritype): > Turtle.__init__(self, shape="triangle") > self.c = c > self.r = r > self.speed(0) > self.pencolor(0,0,0) > if tritype == 1: > self.basecolor = (1.0, 0.80392, 0.0) > self.f = -1 > self.left(30) > else: > self.basecolor = (0.43137, 0.43137, 1.0) > self.f = 1 > self.left(90) > self.fillcolor(self.basecolor) > self.pu() > self.goto(c*A, r*A*3**.5/3) > self.shapesize(SHS, SHS, 1) > self.D = self.distance(0,0) > self.e = (1/self.D)*self.pos() > def setturn(self, phi): > self.goto(SF*self.D*dsin(90-phi)*self.e) > self.settiltangle(phi*self.f) > self.shapesize(SHS*SF) > if abs(self.c) + abs(self.r) > 2: > self.fillcolor([x + (1-x)*phi/360 for x in self.basecolor]) > bc = phi/360. > self.pencolor(bc, bc, bc) > > > s = Screen() > s.reset() > s.tracer(0) > d = Turtle(visible=False) > lines(500) > > triangles = [] > for c in range(-5,6,2): > triangles.append(TriTurtle(c, 1, 1)) > triangles.append(TriTurtle(c, -1, 2)) > for c in range(-4,5,2): > triangles.append(TriTurtle(c, 2, 2)) > triangles.append(TriTurtle(c, -2, 1)) > triangles.append(TriTurtle(c, -4, 2)) > triangles.append(TriTurtle(c, 4, 1)) > for c in range(-3,4,2): > triangles.append(TriTurtle(c, 5, 2)) > triangles.append(TriTurtle(c, -5, 1)) > triangles.append(TriTurtle(c, -7, 2)) > triangles.append(TriTurtle(c, 7, 1)) > for c in range(-2,3,2): > triangles.append(TriTurtle(c, 8, 2)) > triangles.append(TriTurtle(c, -8, 1)) > s.tracer(1) > > for phi in range(1,361): > SF = SF*DSF > s.tracer(0) > for t in triangles: > t.setturn(phi) > s.tracer(1) > > mainloop() > > _______________________________________________ > Edu-sig mailing list > Edu-sig@python.org > http://mail.python.org/mailman/listinfo/edu-sig > > -- Silent Thunder (默雷/धर्ममेघशब्दगर्ज/دھرممیگھشبدگر ج) is my name And Children are my nation. The Cosmos is my dwelling place, The Truth my destination. http://earthtreasury.org/worknet (Edward Mokurai Cherlin)
# uses turtle module from Python 2.6 # hint from Kirby, 15. 5. 09 # http://www.4dsolutions.net/presentations/pdf_animation_by_ron_resch.pdf from turtle import Turtle, Screen, Vec2D, mainloop import math A = 50. # adjust this to your needs SHS = A / 20 SF = 1.0 DSF = 1.0038582416 e = Vec2D(3**.5/2, 0.5) def dsin(angle): return math.sin(angle*math.pi/180) def lines(l): for i in range(6): d.fd(l) d.bk(l) d.left(60) class TriTurtle(Turtle): def __init__(self, c, r, tritype): Turtle.__init__(self, shape="triangle") self.c = c self.r = r self.speed(0) self.pencolor(0,0,0) if tritype == 1: self.basecolor = (1.0, 0.80392, 0.0) self.f = -1 self.left(30) else: self.basecolor = (0.43137, 0.43137, 1.0) self.f = 1 self.left(90) self.fillcolor(self.basecolor) self.pu() self.goto(c*A, r*A*3**.5/3) self.shapesize(SHS, SHS, 1) self.D = self.distance(0,0) self.e = (1/self.D)*self.pos() def setturn(self, phi): self.goto(SF*self.D*dsin(90-phi)*self.e) self.settiltangle(phi*self.f) self.shapesize(SHS*SF) if abs(self.c) + abs(self.r) > 2: self.fillcolor([x + (1-x)*phi/360 for x in self.basecolor]) bc = phi/360. self.pencolor(bc, bc, bc) s = Screen() s.reset() s.tracer(0) d = Turtle(visible=False) lines(500) triangles = [] for c in range(-5,6,2): triangles.append(TriTurtle(c, 1, 1)) triangles.append(TriTurtle(c, -1, 2)) for c in range(-4,5,2): triangles.append(TriTurtle(c, 2, 2)) triangles.append(TriTurtle(c, -2, 1)) triangles.append(TriTurtle(c, -4, 2)) triangles.append(TriTurtle(c, 4, 1)) for c in range(-3,4,2): triangles.append(TriTurtle(c, 5, 2)) triangles.append(TriTurtle(c, -5, 1)) triangles.append(TriTurtle(c, -7, 2)) triangles.append(TriTurtle(c, 7, 1)) for c in range(-2,3,2): triangles.append(TriTurtle(c, 8, 2)) triangles.append(TriTurtle(c, -8, 1)) s.tracer(1) for phi in range(1,361): SF = SF*DSF s.tracer(0) for t in triangles: t.setturn(phi) s.tracer(1) mainloop()
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