What drawing methods does canvas contain?

Canvas drawing methods include canvas initialization method, basic drawing method, path drawing method, style setting method, gradient and shadow method, transformation method, composition method and animation method. Detailed introduction: 1. Canvas initialization method, "getContext()" gets the drawing context and returns a context object for drawing. You can specify 2d or webgl drawing mode. "getImageData()" gets the pixel data of the specified area on the canvas; 2 , basic drawing methods, "fillRect()" and so on.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Canvas is an element provided by HTML5 for drawing graphics, animation and image processing. It provides a series of drawing methods to operate pixels on the canvas to achieve various effects and interactions.

Canvas initialization method:

getContext(): Get the drawing context and return a context object used for drawing. You can specify 2d or webgl drawing mode.

getImageData(): Get the pixel data of the specified area on the canvas.

Basic drawing method:

fillRect(): Draw a filled rectangle.

strokeRect(): Draw a rectangular border.

clearRect(): Clear the pixels in the specified area.

fillText(): Draw fill text.

strokeText(): Draw text border.

drawImage(): Draw an image.

Path drawing method:

beginPath(): Start a new path.

moveTo(): ​​Move the drawing cursor to the specified position.

lineTo(): ​​Draw a straight line to the specified position.

arc(): Draw an arc.

quadraticCurveTo(): ​​Draw a quadratic Bezier curve.

bezierCurveTo(): ​​Draw a cubic Bezier curve.

closePath(): Close the path.

Style setting method:

fillStyle: Set the fill style.

strokeStyle: Set the border style.

lineWidth: Set the line width.

lineCap: Set the line endpoint style.

lineJoin: Set the line connection style.

globalAlpha: Set drawing transparency.

Gradient and shadow methods:

createLinearGradient(): Create a linear gradient object.

createRadialGradient(): Create a radial gradient object.

addColorStop(): Define the color and position in the gradient.

shadowOffsetX: Set the horizontal offset of the shadow.

shadowOffsetY: Set the vertical offset of the shadow.

shadowBlur: Set the blur level of shadows.

shadowColor: Set the color of the shadow.

Transformation method:

rotate(): Rotate the canvas.

scale(): Scale the canvas.

translate(): Translate the canvas.

transform(): Set the canvas transformation matrix.

setTransform(): Reset the transformation matrix of the canvas.

Composition method:

globalCompositeOperation: Set the drawing synthesis method, such as covering, intersecting, overlaying, etc.

Animation method:

requestAnimationFrame(): Requests the browser to execute animation frames, used to create continuous animation effects.

The above are commonly used drawing methods in Canvas. By combining and using these methods, programmers can achieve various drawing effects, including drawing basic graphics, drawing text, path drawing, style settings, gradients and shadows, and transformations. , composition and animation, etc.

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