topical media & game development
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

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graphic-processing-site-examples-Topics-Interaction-Follow1-Follow1.pde / pde
Follow 1. Based on code from Keith Peters (www.bit-101.com). 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(200, 200);
    smooth(); 
    strokeWeight(20.0);
    stroke(0, 100);
  }
  
  void draw() {
    background(226);
    
    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();
  }
[] readme course(s) preface I 1 2 II 3 4 III 5 6 7 IV 8 9 10 V 11 12 afterthought(s) appendix reference(s) example(s) resource(s) _

(C) Æliens 20/2/2008

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