What are the canvas coordinate axis transformations?

Canvas coordinate axis transformation includes translation, rotation, scaling, cropping and other operations. Detailed introduction: 1. Translation, by using the translate(x, y) method, move the origin (0, 0) of the Canvas to the specified position (x, y), so that the drawn graphics will be drawn based on the new origin. ; 2. Rotation, by using the rotate(angle) method, rotate the Canvas around the current origin at a specified angle. The angle can be expressed in radians or degrees; 3. Zoom, etc.

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

Canvas coordinate axis transformation mainly includes operations such as translation, rotation, scaling and cropping. The following is a brief description of each transformation:

1. Translation: Move the origin of the Canvas (0, 0) to the specified position(x, y). The graph drawn in this way will be drawn based on the new origin.

2. Rotation: Rotate the Canvas at a specified angle around the current origin using the rotate(angle) method. Angle can be expressed in radians or degrees.

3. Scaling: Scale the Canvas according to the specified ratio in the horizontal and vertical directions by using the scale(scaleX, scaleY) method. A ratio greater than 1 means enlargement, and a ratio less than 1 means reduction.

4. Clipping: By using the clip() method, you can create a clipping area, and only graphics within this area will be displayed. You can use the rect(x, y, width, height) method to specify the position and size of the cropping area.

These axis transformation operations can be used individually or in combination to achieve more complex effects. For example, you can translate first, then rotate and scale to draw graphics at different positions, angles, and sizes.

It should be noted that these coordinate axis transformation operations are performed relative to the current state of the Canvas, not absolute. Each transformation will modify the current state of the Canvas, so when performing multiple transformations, pay attention to the order of transformations and their mutual influence.

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