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49 lines
1.1 KiB
Plaintext
49 lines
1.1 KiB
Plaintext
/**
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* Star
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*
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* The star() function created for this example is capable of drawing a
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* wide range of different forms. Try placing different numbers into the
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* star() function calls within draw() to explore.
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*/
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void setup() {
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size(640, 360);
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}
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void draw() {
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background(102);
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pushMatrix();
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translate(width*0.2, height*0.5);
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rotate(frameCount / 200.0);
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star(0, 0, 5, 70, 3);
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popMatrix();
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pushMatrix();
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translate(width*0.5, height*0.5);
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rotate(frameCount / 50.0);
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star(0, 0, 80, 100, 40);
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popMatrix();
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pushMatrix();
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translate(width*0.8, height*0.5);
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rotate(frameCount / -100.0);
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star(0, 0, 30, 70, 5);
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popMatrix();
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}
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void star(float x, float y, float radius1, float radius2, int npoints) {
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float angle = TWO_PI / npoints;
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float halfAngle = angle/2.0;
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beginShape();
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for (float a = 0; a < TWO_PI; a += angle) {
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float sx = x + cos(a) * radius2;
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float sy = y + sin(a) * radius2;
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vertex(sx, sy);
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sx = x + cos(a+halfAngle) * radius1;
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sy = y + sin(a+halfAngle) * radius1;
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vertex(sx, sy);
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}
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endShape(CLOSE);
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}
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