How do I represent actions that can be performed on a canvas?

1. How can you tell if something is drawn on canvas?
2. Which method of the context can be used to draw an image on the canvas?
3. What is the HTML canvas element and how do we use it to draw in the browser window?

How can you tell if something is drawn on canvas?

1) set drawn=false, then set to true if ! 0 is encountered 2) detach the data from the image : var imgData = d.

Which method of the context can be used to draw an image on the canvas?

The drawImage() method draws an image, canvas, or video onto the canvas. The drawImage() method can also draw parts of an image, and/or increase/reduce the image size.

What is the HTML canvas element and how do we use it to draw in the browser window?

The HTML <canvas> element is used to draw graphics, on the fly, via JavaScript. The <canvas> element is only a container for graphics. You must use JavaScript to actually draw the graphics. Canvas has several methods for drawing paths, boxes, circles, text, and adding images.