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This article introduces the relevant knowledge of "how to establish the coordinate system of WeChat Mini Programs". In the operation of the actual case, many people will encounter such a dilemma. Then let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Canvas coordinate system

Canvas is in a two-dimensional grid.

The coordinates of the upper left corner are (0,0).

In the previous chapter, we used this method fillRect (0,0,150,75).

It means: draw a rectangle of 150x 75px starting from the upper left corner (0,0).

Examples of coordinate systems:

We can add some events to observe its coordinate system.

Coordinates: ({{x}}, {{y}}) Page ({data: {x: 0, y: 0, hidden: true}, start: function (e) {this.setData ({hidden: false, x: e.touches [0] .x, y: e.touches [0] .y})}, move: function (e) {this.setData ({x: e.touches [0] .x) Y: e.touches [0] .y}), end: function (e) {this.setData ({hidden: true})})

When you put your finger in the canvas, the coordinates of the contact point are displayed below.

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