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-Motion-MovingOnCurves-MovingOnCurves.pde / pde
Moving On Curves. In this example, the circles moves along the curve y = x^4. Click the mouse to have it move to a new position. 

  
  
  float beginX = 20.0;  // Initial x-coordinate
  float beginY = 10.0;  // Initial y-coordinate
  float endX = 570.0;   // Final x-coordinate
  float endY = 320.0;   // Final y-coordinate
  float distX;          // X-axis distance to move
  float distY;          // Y-axis distance to move
  float exponent = 4;   // Determines the curve
  float x = 0.0;        // Current x-coordinate
  float y = 0.0;        // Current y-coordinate
  float step = 0.01;    // Size of each step along the path
  float pct = 0.0;      // Percentage traveled (0.0 to 1.0)
  
  void setup() 
  {
    size(640, 360);
    noStroke();
    smooth();
    distX = endX - beginX;
    distY = endY - beginY;
  }
  
  void draw() 
  {
    fill(0, 2);
    rect(0, 0, width, height);
    pct += step;
    if (pct < 1.0) {
      x = beginX + (pct * distX);
      y = beginY + (pow(pct, exponent) * distY);
    }
    fill(255);
    ellipse(x, y, 20, 20);
  }
  
  void mousePressed() {
    pct = 0.0;
    beginX = x;
    beginY = y;
    endX = mouseX;
    endY = mouseY;
    distX = endX - beginX;
    distY = endY - beginY;
  }
[] 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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