이 내용은 다음 레퍼런스를 참고하였다.
PGraphics circles;
void setup() {
size(100, 100);
circles = createGraphics(width, height); circles.beginDraw();
circles.background(0);
circles.noStroke();
circles.fill(255, 100); circles.endDraw();
noCursor();
}
void draw() {
image(circles, 0, 0);
stroke(255);
line(mouseX, 0, mouseX, height);
line(0, mouseY, width, mouseY);
}
void mousePressed() {
circles.beginDraw();
circles.ellipse(mouseX, mouseY, 40, 40);
circles.endDraw();
}


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