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---
layout: default
---
<h3>Arm</h3>
<p>The angle of each segment is controlled with the mouseX and
mouseY position. The transformations applied to the first segment
are also applied to the second segment because they are inside
the same pushMatrix() and popMatrix() group.</p>
<p><a href="http://processing.org/learning/basics/arm.html">Original Processing.org Example: Arm</a><br>
<div class="learning-demo"><script type="application/processing">
float x = 50;
float y = 100;
float angle1 = 0.0;
float angle2 = 0.0;
float segLength = 50;
void setup() {
size(200, 200);
smooth();
strokeWeight(20.0);
stroke(0, 100);
}
void draw() {
background(226);
angle1 = (mouseX/float(width) - 0.5) * -PI;
angle2 = (mouseY/float(height) - 0.5) * PI;
pushMatrix();
segment(x, y, angle1);
segment(segLength, 0, angle2);
popMatrix();
}
void segment(float x, float y, float a) {
translate(x, y);
rotate(a);
line(0, 0, segLength, 0);
}
</script><canvas width="200" height="200"></canvas></div></p>
<div style="height:0px;width:0px;overflow:hidden;"></div>
<div class="code"><pre name="code" class="processing">// All Examples Written by Casey Reas</a> and Ben Fry</a>
// unless otherwise stated.
float x = 50;
float y = 100;
float angle1 = 0.0;
float angle2 = 0.0;
float segLength = 50;
void setup() {
size(200, 200);
smooth();
strokeWeight(20.0);
stroke(0, 100);
}
void draw() {
background(226);
angle1 = (mouseX/float(width) - 0.5) * -PI;
angle2 = (mouseY/float(height) - 0.5) * PI;
pushMatrix();
segment(x, y, angle1);
segment(segLength, 0, angle2);
popMatrix();
}
void segment(float x, float y, float a) {
translate(x, y);
rotate(a);
line(0, 0, segLength, 0);
}</pre></div>