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@mutterer
Forked from spoike/sketch_aug31b.pde
Created February 28, 2020 20:14
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Processing Sketch - Flames!
/**
* Flames. Generates some flames by using gradients (with basic
* spline math) and Perlin noise (for generating the flame
* height).
*/
/** Flame outer color */
color startCol = color(100, 0, 210);
/** Flame inner color */
color endCol = color(200, 150, 255);
void setup() {
int w = 150;
int h = 150;
frame.removeNotify();
frame.setUndecorated(true);
frame.addNotify();
size(w, h);
background(backCol);
pgCurrent = createGraphics(w, h, P3D);
pgPrevious = createGraphics(w, h, P3D);
gradient = new Gradient(startCol, endCol);
}
Gradient gradient;
PGraphics pgCurrent;
PGraphics pgPrevious;
int col = 255;
int fadeFalloff = 25;
float wFactor = 0.02;
float time = 0;
float timeScale = 0.05;
int backCol = 50;
int yOffset = -5;
void draw() {
drawFlames(pgCurrent, pgPrevious);
image(pgCurrent, 0, 0);
}
void drawFlames(PGraphics pg, PGraphics pgOld) {
pgOld.beginDraw();
pgOld.image(pg, 0, 0);
pgOld.endDraw();
pg.beginDraw();
pg.image(pgOld, 1, yOffset);
pg.fill(backCol, fadeFalloff);
pg.noStroke();
pg.rect(0, 0, width, height);
for(int w = 0; w < width; w++) {
float h = noise(w*wFactor, time)*height;
for (int y = (int)h; y<height; y++) {
float t = ((y)-h)/((float)height-h);
pg.stroke(gradient.getAt(t));
pg.point(w, y);
}
}
time += timeScale;
pg.endDraw();
}
class Gradient {
color start;
color end;
Gradient(color start, color end) {
this.start = start;
this.end = end;
}
public color getAt(float t) {
float r = spline(red(start), red(end), t);
float g = spline(green(start), green(end), t);
float b = spline(blue(start), blue(end), t);
return color(r, g, b);
}
private float spline(float a, float b, float t) {
return a+t*(b-a);
}
}
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