


Detailed explanation of wxcanvas in small program development
The test phone is IPHONE6, developer tool version 0.10.102800
canvas in the WeChat applet has many differences with non-h5 canvas. The following is the WeChat applet The canvas of the program is called wxcanvas
The following are all the useful information that I tested little by little. Please read patiently:
1.wxcanvas does not have width and ## like h5canvas. #heightAttribute and the style of width and height. It only has a style, which can be understood as a box;
2. Don’t think of wxcanvas as a real H5canvas, just think of it as a p. Things that draw ranges also exist. Change the width and height. It is displayed, or there is redrawing here, but I don’t know how to implement it; 3. Changing the width and height of the style of wxcanvas does not change the size of the things on the original canvas; 4. The enlargement and reduction in the css transform transformation cannot change the size of things on the original canvas 5. Official statement: context is just a container that records method calls, used to generate and record drawing behaviors. actions array. There is no corresponding relationship between context and . The drawing action array of a context-generated canvas can be applied to multiple . In fact, after context.getActions(), the information in the context will be cleared. If you want to reuse it, you need var temp=context.getActions() to save the operation array before it can be reused in wx .drawcanvas;6. Notewx.drawCanvas({ canvasId: 'target', actions: context.getActions() });
wx.drawCanvas({ canvasId: 'target', actions: context.getActions(), reserve:true });
7.《Key Points》
<canvas disable-scroll="true" catchtouchmove="ccvsMove" bindtouchmove="cvsMove" canvas-id="target" id="target" style='width:{{width}}px;height:{{height}}px'></canvas>
eventObject, including pageX, clientX, etc.
cvsMove returns a canvasTouch event object, without pageX, clientX, Only x, y8.wx.drawCanvas({ canvasId: 'target', actions: [], reserve:false });
wx.canvasToTempFilePath参数为一个对象包括canvasID,success,fail,complete,和wx.saveFile差不多;
wx.canvasToTempFilePath({ canvasId: 'target', success: function success(res) { wx.saveFile({ tempFilePath: res.tempFilePath, success: function success(res) { console.log('saved::' + res.savedFilePath); }, complete: function fail(e) { console.log(e.errMsg); } }); }, complete: function complete(e) { console.log(e.errMsg); } });
Share what I think about WeChat mini programs
2.Use html5 canvas and Sample code for creating a drawing program using JavaScript
3.The future and development of front-end and WeChat mini programs
4.Options for mini program development Simple implementation example of card
The above is the detailed content of Detailed explanation of wxcanvas in small program development. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Schools using canvas include Stanford University, MIT, Columbia University, University of California, Berkeley, etc. Detailed introduction: 1. Stanford University uses Canvas as its main online learning platform. Teachers and students at Stanford University use Canvas to manage and communicate course content, and learn through functions such as online discussions, assignment submissions, and exams; 2. Ma Provincial Polytechnic Institute and MIT also use Canvas as their online learning management system and conduct course management through the Canvas platform; 3. Columbia University, etc.

Explore the Canvas framework: To understand what are the commonly used Canvas frameworks, specific code examples are required. Introduction: Canvas is a drawing API provided in HTML5, through which we can achieve rich graphics and animation effects. In order to improve the efficiency and convenience of drawing, many developers have developed different Canvas frameworks. This article will introduce some commonly used Canvas frameworks and provide specific code examples to help readers gain a deeper understanding of how to use these frameworks. 1. EaselJS framework Ea

The canvas arrow plug-ins include: 1. Fabric.js, which has a simple and easy-to-use API and can create custom arrow effects; 2. Konva.js, which provides the function of drawing arrows and can create various arrow styles; 3. Pixi.js , which provides rich graphics processing functions and can achieve various arrow effects; 4. Two.js, which can easily create and control arrow styles and animations; 5. Arrow.js, which can create various arrow effects; 6. Rough .js, you can create hand-drawn arrows, etc.

The versions of html2canvas include html2canvas v0.x, html2canvas v1.x, etc. Detailed introduction: 1. html2canvas v0.x, which is an early version of html2canvas. The latest stable version is v0.5.0-alpha1. It is a mature version that has been widely used and verified in many projects; 2. html2canvas v1.x, this is a new version of html2canvas.

The details of the canvas clock include clock appearance, tick marks, digital clock, hour, minute and second hands, center point, animation effects, other styles, etc. Detailed introduction: 1. Clock appearance, you can use Canvas to draw a circular dial as the appearance of the clock, and you can set the size, color, border and other styles of the dial; 2. Scale lines, draw scale lines on the dial to represent hours or minutes. Position; 3. Digital clock, you can draw a digital clock on the dial to indicate the current hour and minute; 4. Hour hand, minute hand, second hand, etc.

How to use canvas to draw charts and animation effects in uniapp requires specific code examples 1. Introduction With the popularity of mobile devices, more and more applications need to display various charts and animation effects on the mobile terminal. As a cross-platform development framework based on Vue.js, uniapp provides the ability to use canvas to draw charts and animation effects. This article will introduce how uniapp uses canvas to achieve chart and animation effects, and give specific code examples. 2. canvas

The tkinter canvas attributes include bg, bd, relief, width, height, cursor, highlightbackground, highlightcolor, highlightthickness, insertbackground, insertwidth, selectbackground, selectforeground, xscrollcommand attributes, etc. Detailed introduction

Understand the power and application of canvas in game development Overview: With the rapid development of Internet technology, web games are becoming more and more popular among players. As an important part of web game development, canvas technology has gradually emerged in game development, showing its powerful power and application. This article will introduce the potential of canvas in game development and demonstrate its application through specific code examples. 1. Introduction to canvas technology Canvas is a new element in HTML5, which allows us to use
