clear()
Clears the pixels on the canvas.
clear() makes every pixel 100% transparent.
Examples

function setup()
size(100, 100)
background(200)
describe('A gray square. White circles are drawn as the user moves the mouse. The circles disappear when the user presses the mouse.')
end
function draw()
circle(mouseX, mouseY, 20)
end
function mousePressed()
clear()
background(200)
end
Syntax
clear()