Skip to content

Instantly share code, notes, and snippets.

@beesandbombs
Created July 26, 2017 23:30
Show Gist options
  • Save beesandbombs/ffc2389be0917f187ebebc36dc40739f to your computer and use it in GitHub Desktop.
Save beesandbombs/ffc2389be0917f187ebebc36dc40739f to your computer and use it in GitHub Desktop.
polygon walkers
// by dave @beesandbombs
int[][] result;
float t, c;
float ease(float p) {
return 3*p*p - 2*p*p*p;
}
float ease(float p, float g) {
if (p < 0.5)
return 0.5 * pow(2*p, g);
else
return 1 - 0.5 * pow(2*(1 - p), g);
}
float mn = .5*sqrt(3), ia = atan(sqrt(.5));
void push() {
pushMatrix();
pushStyle();
}
void pop() {
popStyle();
popMatrix();
}
void draw() {
if (!recording) {
t = mouseX*1.0/width;
c = mouseY*1.0/height;
if (mousePressed)
println(c);
draw_();
} else {
for (int i=0; i<width*height; i++)
for (int a=0; a<3; a++)
result[i][a] = 0;
c = 0;
for (int sa=0; sa<samplesPerFrame; sa++) {
t = map(frameCount-1 + sa*shutterAngle/samplesPerFrame, 0, numFrames, 0, 1);
draw_();
loadPixels();
for (int i=0; i<pixels.length; i++) {
result[i][0] += pixels[i] >> 16 & 0xff;
result[i][1] += pixels[i] >> 8 & 0xff;
result[i][2] += pixels[i] & 0xff;
}
}
loadPixels();
for (int i=0; i<pixels.length; i++)
pixels[i] = 0xff << 24 |
int(result[i][0]*1.0/samplesPerFrame) << 16 |
int(result[i][1]*1.0/samplesPerFrame) << 8 |
int(result[i][2]*1.0/samplesPerFrame);
updatePixels();
saveFrame("p####.gif");
if (frameCount==numFrames)
exit();
}
}
//////////////////////////////////////////////////////////////////////////////
int samplesPerFrame = 4;
int numFrames = 1080;
float shutterAngle = .5;
boolean recording = false;
void setup() {
size(750, 750, P2D);
smooth(8);
strokeWeight(1.5);
strokeCap(ROUND);
result = new int[width*height][3];
}
float x, y, z, tt;
float l = 75;
void poly(int N) {
for (int i=0; i<N; i++) {
push();
rotate(TWO_PI*i/N);
line(-l/2, l/(2*tan(PI/N)), l/2, l/(2*tan(PI/N)));
pop();
}
}
float qq, rot;
void walker(int N, float q) {
qq = (N*q)%1;
rot = TWO_PI*int(N*q)/N;
push();
rotate(rot);
translate(-l/2, l/(2*tan(PI/N)));
rotate((PI*2/3 + TWO_PI/N)*ease(qq));
triangle(0, 0, l, 0, l/2, l*mn);
pop();
}
void draw_() {
background(255);
push();
translate(width/2, height/2);
rotate(PI);
stroke(0);
noFill();
blendMode(NORMAL);
for (int i=3; i<12; i++) {
l = 12 + 10*i;
poly(i);
}
fill(255);
noStroke();
blendMode(EXCLUSION);
for (int i=3; i<12; i++) {
l = 12 + 10*i;
walker(i, (13-i)*t);
}
pop();
}
@shaunlebron
Copy link

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment