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square spiral
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();
}
float c01(float g) {
return constrain(g, 0, 1);
}
void draw() {
if (recording) {
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("f###.gif");
if (frameCount==numFrames)
exit();
} else if (preview) {
c = mouseY*1.0/height;
if (mousePressed)
println(c);
t = (millis()/(20.0*numFrames))%1;
draw_();
} else {
t = mouseX*1.0/width;
c = mouseY*1.0/height;
if (mousePressed)
println(c);
draw_();
}
}
//////////////////////////////////////////////////////////////////////////////
int samplesPerFrame = 4;
int numFrames = 280;
float shutterAngle = .6;
boolean recording = false,
preview = true;
void setup() {
size(800, 800, P3D);
smooth(8);
rectMode(CENTER);
result = new int[width*height][3];
fill(32);
noStroke();
coords[0][0] = 0;
coords[0][1] = 0;
in = 1;
for(int i=0; i<80; i++){
dx = int(sin(HALF_PI*i));
dy = int(cos(HALF_PI*i));
l = 4*(i+1);
for(int j=0; j<l; j++){
coords[in][0] = coords[in-1][0] + dx;
coords[in][1] = coords[in-1][1] + dy;
in++;
}
}
numPts = in;
}
float x, y, z, tt;
int N = 12;
int numPts;
int in;
float scale = 1.68, sw;
int dx, dy, l;
float[][] coords = new float[16000][2];
float phase, rotation, wavelength = 20;
float minWeight = 1.8, maxWeight = 7.8;
int zoomSpeed = 3;
void draw_() {
rotation = HALF_PI*t;
background(250);
push();
translate(width/2, height/2);
rotate(HALF_PI);
for(int i=0; i<numPts-8; i++){
x = scale*coords[i][0];
y = scale*coords[i][1];
phase = max(abs(x*cos(rotation)+y*sin(rotation)),abs(y*cos(rotation)-x*sin(rotation)))/wavelength;
sw = cos(TWO_PI*zoomSpeed*t - phase);
sw = map(sw,1,-1,0,1);
sw = lerp(minWeight,maxWeight,ease(c01(1.3*sw-0.2)));
strokeWeight(sw);
rect(x,y,sw,sw);
}
pop();
}
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