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---
layout: default
---
<h3>Loop</h3>
<p>The loop() function causes draw() to execute
continuously. If noLoop is called in setup()
the draw() is only executed once. In this example
click the mouse to execute loop(), which will
cause the draw() the execute continuously.</p>
<p><a href="http://processing.org/learning/basics/loop.html">Original Processing.org Example: Loop</a><br>
<div class="learning-demo"><script type="application/processing">
// The statements in the setup() function
// execute once when the program begins
void setup()
{
size(200, 200); // Size should be the first statement
stroke(255); // Set stroke color to white
noLoop();
}
float y = 100;
// The statements in draw() are run until the
// program is stopped. Each statement is run in
// sequence and after the last line is read, the first
// line is run again.
void draw()
{
background(0); // Set the background to black
line(0, y, width, y);
y = y - 1;
if (y < 0) {
y = height;
}
}
void mousePressed()
{
loop();
}
</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.
// The statements in the setup() function
// execute once when the program begins
void setup()
{
size(200, 200); // Size should be the first statement
stroke(255); // Set stroke color to white
noLoop();
}
float y = 100;
// The statements in draw() are run until the
// program is stopped. Each statement is run in
// sequence and after the last line is read, the first
// line is run again.
void draw()
{
background(0); // Set the background to black
line(0, y, width, y);
y = y - 1;
if (y < 0) {
y = height;
}
}
void mousePressed()
{
loop();
}</pre></div>