a port of the Processing Visualization Language

Reach1

Based on code from Keith Peters (www.bit-101.com) The arm follows the position of the mouse by calculating the angles with atan2().

Original Processing.org Example: Reach1

// All Examples Written by Casey Reas and Ben Fry

// unless otherwise stated.

float x = 100;

float y = 100;

float x2 = 100;

float y2 = 100;

float segLength = 30;



void setup() {

  size(200, 200);

  smooth(); 

  strokeWeight(20.0);

  stroke(0, 100);

}



void draw() {

  background(226);

  

  float dx = mouseX - x;

  float dy = mouseY - y;

  float angle1 = atan2(dy, dx);  

  

  float tx = mouseX - cos(angle1) * segLength;

  float ty = mouseY - sin(angle1) * segLength;

  dx = tx - x2;

  dy = ty - y2;

  float angle2 = atan2(dy, dx);  

  x = x2 + cos(angle2) * segLength;

  y = y2 + sin(angle2) * segLength;

  

  segment(x, y, angle1); 

  segment(x2, y2, angle2); 

}



void segment(float x, float y, float a) {

  pushMatrix();

  translate(x, y);

  rotate(a);

  line(0, 0, segLength, 0);

  popMatrix();

}
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