Created
November 6, 2013 12:07
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// EDIT THIS | |
trackLayer=effect("Einstellungen für Ebenen")("Ebene"); | |
cornerPin=trackLayer.effect("Eckpunkte verschieben"); | |
// DO NOT EDIT THIS | |
trackPoint=value | |
c0=cornerPin("Oben links").valueAtTime(0); | |
c1=cornerPin("Unten links").valueAtTime(0); | |
c2=cornerPin("Unten rechts").valueAtTime(0); | |
c3=cornerPin("Oben rechts").valueAtTime(0); | |
p0=cornerPin("Oben links"); | |
p1=cornerPin("Unten links"); | |
p2=cornerPin("Unten rechts"); | |
p3=cornerPin("Oben rechts"); | |
function Track(p) | |
{ | |
a = (c1[1]-c0[1])*(c2[0]-c3[0]-c1[0]+c0[0]) - (c1[0]-c0[0])*(c2[1]-c3[1]-c1[1]+c0[1]); | |
b = (p[0]-c0[0])*(c2[1]-c3[1]-c1[1]+c0[1]) - (c1[0]-c0[0])*(c3[1]-c0[1]) - (p[1]-c0[1])*(c2[0]-c3[0]-c1[0]+c0[0]) + (c1[1]-c0[1])*(c3[0]-c0[0]); | |
c = (p[0]-c0[0])*(c3[1]-c0[1]) - (p[1]-c0[1])*(c3[0]-c0[0]); | |
d = b*b - 4*a*c; | |
if (d < 0) | |
return p; | |
if (a != 0) | |
dx = (-b + Math.sqrt(d)) / (2*a); | |
else | |
dx = -c/b; | |
dy = (p[0] - c0[0] - dx * (c1[0] - c0[0])) / (c3[0] + dx * (c2[0] - c3[0]) - c0[0] - dx * (c1[0]- c0[0])); | |
A = p0 + dx * (p1 - p0); | |
B = p3 + dx * (p2- p3); | |
return A + dy * (B - A); | |
} | |
Track(trackPoint); |
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