Use the getcontext () html object, with properties and methods:

How to draw on canvas. But, to draw lines (and other shapes in canvas), we first need to understand how canvas coordinates work. By the end of this article, you will have learned how to draw rectangles, triangles, lines, arcs and curves, providing familiarity with. Canvas includes functions for drawing straight lines, circles, bézier curves, and more.

Here is a jsperf to demonstrate why this is the only right way to clone a canvas: Attach a mousedown, mousemove, and mouseup event listener to the canvas dom. You need to use the getelementbyid () method to find the canvas element.

You must use a script to actually draw the graphics. Web line drawing in canvas uses paths : Use the html dom method getelementbyid () and getcontext () before drawing on the canvas.

To erase your drawing, select the eraser option. The examples provided should give you some clear ideas about what you can do with canvas, and will provide code snippets that may get you started in building your own content. It does not draw anything, it just sets a start point.

Var canvas =document.getelementbyid ( canvas ); Basically, this involves writing code to specify exactly what path the pen should move along on your canvas to trace the shape you want to draw. // define a start point ctx.moveto(0, 0);

By default, a canvas has no border and no content. To get out of eraser mode, click. Draw the image on the canvas using the drawimage() function.