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- /**
- * Follow 1
- * based on code from Keith Peters.
- *
- * A line segment is pushed and pulled by the cursor.
- */
- float x = 100;
- float y = 100;
- float angle1 = 0.0;
- float segLength = 50;
- void setup() {
- size(640, 360);
- strokeWeight(20.0);
- stroke(255, 100);
- }
- void draw() {
- background(0);
- float dx = mouseX - x;
- float dy = mouseY - y;
- angle1 = atan2(dy, dx);
- x = mouseX - (cos(angle1) * segLength);
- y = mouseY - (sin(angle1) * segLength);
- segment(x, y, angle1);
- ellipse(x, y, 20, 20);
- }
- void segment(float x, float y, float a) {
- pushMatrix();
- translate(x, y);
- rotate(a);
- line(0, 0, segLength, 0);
- popMatrix();
- }
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