cheerpjCreateDisplay

Display GUI elements

cheerpjCreateDisplay adds an element to the DOM which will be used for graphical rendering.

function cheerpjCreateDisplay(
  width: number,
  height: number,
  parent?: HTMLElement
): HTMLElement;

Parameters

• width (number) - The width of the display area in CSS pixels, or -1 to match parent width.
• height (number) - The height of the display area in CSS pixels, or -1 to match parent height.
• parent (HTMLElement, optional) - Element to add display as a child of.

Returns

cheerpjCreateDisplay returns an HTMLElement representing the created display.

Examples

Create a display

cheerpjCreateDisplay(800, 600);

This creates a 800x600 display for rendering, and appends it to the document body.

Take up the whole page

cheerpjCreateDisplay(-1, -1, document.body);

This creates a display that takes up the whole page, and responds to changes in the page size.

Usage with React

import { useRef, useEffect } from "react";

function Display({ width, height }) {
  const parent = useRef();
  useEffect(() => {
    cheerpjCreateDisplay(width, height, parent);
  });
  return <div ref={parent} />;
}