Which canvas to use for js drawing?

The canvas methods for js drawing include getContext(), drawing basic shapes, drawing text, drawing images, gradients and shadows, animation effects, event processing, etc. Detailed introduction: 1. getContext() method. You can obtain a drawing context through the getContext() method of Canvas. A common drawing context is a 2D context. Use getContext('2d') to obtain it; 2. Draw basic shape methods, such as drawing Rectangle, circle, etc.; 3. Drawing text methods, etc.

The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

In JavaScript, you can use the Canvas element provided by HTML5 to perform drawing operations. Canvas is an HTML element that can be manipulated and drawn using JavaScript. The following are some commonly used Canvas operation methods:

1. getContext(): A drawing context (context) can be obtained through the getContext() method of Canvas, which can be 2D or 3D. A common drawing context is the 2D context, which can be obtained using getContext('2d').

2. Draw basic shapes: Canvas provides a series of drawing methods, such as drawing rectangle (rect), circle (arc), straight line (lineTo), path (path), etc., you can Use these methods to draw basic shapes.

3. Drawing text: Canvas provides methods for drawing text, such as fillText and strokeText, and you can set the font, size, color and other styles of the text.

4. Draw images: Canvas can draw images, and you can use the drawImage method to draw images onto Canvas.

5. Gradient and shadow: Canvas supports gradient and shadow effects. You can use the createLinearGradient or createRadialGradient method to create a gradient object, and use the shadowOffsetX, shadowOffsetY, shadowBlur and shadowColor properties to set the shadow effect.

6. Animation effect: Canvas animation effect can be achieved by using a timer (such as setInterval or requestAnimationFrame) and updating the graphics on the canvas.

7. Event processing: Canvas can handle events such as mouse clicks and movements. You can use the addEventListener method to add event listeners and perform corresponding operations when the event is triggered.

Through the above Canvas operation methods, various drawing needs can be achieved, including drawing basic shapes, drawing text, drawing images, applying gradient and shadow effects, and implementing animation effects and event processing. wait.

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