Examples+
Reach 1
by based on code from Keith Peters
The arm follows the position of the mouse by calculating the angles with atan2().
Highlighted Features
/**
* Reach 1
* based on code from Keith Peters.
*
* The arm follows the position of the mouse by
* calculating the angles with atan2().
*/
float segLength = 80;
float x, y, x2, y2;
void setup() {
size(640, 360);
strokeWeight(20.0);
stroke(255, 100);
x = width/2;
y = height/2;
x2 = x;
y2 = y;
}
void draw() {
background(0);
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();
}
This example is for Processing 4+. If you have a previous version, use the examples included with your software. If you see any errors or have suggestions, please let us know.