[gallery]

A progress indicator in Processing.

    int width = 128;                                                                                                                                                                                    
    int height = 128;

    float amount = 1.0;
    float spokes = 0;

    boolean storeResults = true;

    void setup () {
        size(width, height);
    }

    void draw () {
        fill(0, 0, 0);
        rect(0, 0, width, height);
        stroke(255, 255, 255, 128);
        fill(255, 255, 255, 128);
        float cx, cy;
        cx = width * 0.5;
        cy = height * 0.5;

        for (int i = 0; i < amount * spokes; i++) {
            float angle = i * TWO_PI / (amount * 360);
            float x = cx + cos(angle) * (cx * 0.9);
            float y = cy + sin(angle) * (cy * 0.9);
            float x2 = cx + cos(angle) * (cx * 0.1);
            float y2 = cy + sin(angle) * (cy * 0.1);
            point(x, y);
            DrawLine(x, y, x2, y2);
        }
        spokes++;
    }

    void DrawLine (float fx, float fy, float tx, float ty){
        float res = width * 0.9;
        for (int i = 0; i < res; i++) {
            float x = lerp(fx, tx, i / res);
            float y = lerp(fy, ty, i / res);
            rect (x, y, 1, 1);
        }
    }