Processing.js测试

// Written by Casey Reas and Ben Fry.

int xspacing = 8; // How far apart should each horizontal location be spaced
int w; // Width of entire wave
int maxwaves = 4; // total # of waves to add together

float theta = 0.0f;
float[] amplitude = new float[maxwaves]; // Height of wave
float[] dx = new float[maxwaves]; // Value for incrementing X, to be calculated as a function of period and xspacing
float[] yvalues; // Using an array to store height values for the wave (not entirely necessary)

void setup() {
size(200,200);
frameRate(30);
colorMode(RGB,255,255,255,100);
smooth();
w = width+16;

for (int i = 0; i < maxwaves; i++) { amplitude[i] = random(10,30); float period = random(100,300); // How many pixels before the wave repeats dx[i] = (TWO_PI / period) * xspacing; } yvalues = new float[w/xspacing]; } void draw() { background(0); calcWave(); renderWave(); } void calcWave() { // Increment theta (try different values for 'angular velocity' here theta += 0.02; // Set all height values to zero for (int i = 0; i < yvalues.length; i++) { yvalues[i] = 0.0f; } // Accumulate wave height values for (int j = 0; j < maxwaves; j++) { float x = theta; for (int i = 0; i < yvalues.length; i++) { // Every other wave is cosine instead of sine if (j % 2 == 0) yvalues[i] += sin(x)*amplitude[j]; else yvalues[i] += cos(x)*amplitude[j]; x+=dx[j]; } } } void renderWave() { // A simple way to draw the wave with an ellipse at each location noStroke(); fill(255,50); ellipseMode(CENTER); for (int x = 0; x < yvalues.length; x++) { ellipse(x*xspacing,width/2+yvalues[x],16,16); } }

NOTE: Processing.js runs in FireFox, Safari, Opera, Chrome and will also work with Internet Explorer, using Explorer Canvas.

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