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processing4/java/examples/Basics/Structure/CreateGraphics/CreateGraphics.pde

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/**
* Create Graphics.
*
* The createGraphics() function creates an object from the PGraphics class
* PGraphics is the main graphics and rendering context for Processing.
* The beginDraw() method is necessary to prepare for drawing and endDraw() is
* necessary to finish. Use this class if you need to draw into an off-screen
* graphics buffer or to maintain two contexts with different properties.
*/
PGraphics pg;
void setup() {
size(640, 360);
pg = createGraphics(400, 200);
}
void draw() {
fill(0, 12);
rect(0, 0, width, height);
fill(255);
noStroke();
ellipse(mouseX, mouseY, 60, 60);
pg.beginDraw();
pg.background(51);
pg.noFill();
pg.stroke(255);
pg.ellipse(mouseX-120, mouseY-60, 60, 60);
pg.endDraw();
// Draw the offscreen buffer to the screen with image()
image(pg, 120, 60);
}