Convert HTML page content to a picture or PDF file

1, Convert HTML page content to pictures use html2canvas Take a screenshot. html2canvas can capture the whole or part of the page directly in the user's browser. 1.1 first introduce the html2canvas plug-in You can use < script SRC=“ https://cdn.bootcdn.net/ajax/libs/html2canvas/0.5.0-beta4/html2canvas.min.js "> < / scrip ...

Posted by mailtome on Mon, 23 May 2022 06:05:11 +0300

The small program canvas 2d is a solution for drawing high-definition pictures. It can generate 10M posters at most, which solves the problem of failure to generate pictures under android with too large width and height.

wx.canvasToTempFilePath As we all know, wechat canvas needs to call this interface to generate pictures. If this interface wants to generate high-definition pictures and solve the problem of font blur, it needs destWidth * dpr. The width and height of the original canvas is too large, coupled with destWidth * dpr, will inevitably lead to the wi ...

Posted by phppaper on Sat, 14 May 2022 11:22:10 +0300

Collision detection: Transformation

Introduction stay Collision Detection : Triangle The collision detection of triangles is considered from another idea. So far, the introduction is static detection, and then let's take a look at dynamic collision detection. The following examples are not checked for compatibility. It is recommended to view them in the latest Chrome browser. Or ...

Posted by JankaZ on Fri, 13 May 2022 16:33:57 +0300

Luckysheet, the strongest domestic open source spreadsheet, has won the first place in Github trending!

background Now, with the vigorous development of web technology, office applications, especially excel, have moved online. The more popular ones are Tencent documents, Jinshan documents, graphite documents and google doc, which belong to enterprise services. But what if small businesses or teams want to build their own online form system? Is t ...

Posted by labmixz on Wed, 11 May 2022 20:18:26 +0300

HTML5 Canvas super realistic fireworks bloom animation

Hello front-end friends! The May Day holiday is coming to an end. Before starting the overtime mode, I want to share with you a super cool and super realistic HTML5 Canvas fireworks simulation animation. This upgraded version of fireworks animation has the following features: When the fireworks bloom, they will show different colors, unlike pr ...

Posted by forzatio on Wed, 04 May 2022 16:21:39 +0300

canvas Animation Reality and Performance Optimization

Interpolate an article on canvas animation and performance optimization to lay the foundation for better access to the world of webgl. The content of this article may be a little difficult to understand, and I hope you have questions and will ask them in time. Let's stop gossiping and start today's topic. 1. Animated Reality First, let's int ...

Posted by Assorro on Mon, 02 May 2022 18:04:35 +0300

H5 realizes electronic signature based on Canvas and generates PDF documents

preface Generally speaking, electronic signature is to load electronic signature on electronic documents through technical means. Its function is similar to handwritten signature or official seal on paper contract. Although the legitimacy of electronic signature has been questioned for many years, it is widely used in enterprise workflow appro ...

Posted by diesel on Sun, 01 May 2022 16:14:16 +0300

Judge whether the polygon belongs to complex polygon

In the annotation scene, you can select a region by selecting a multipoint box, which will generate a polygon. However, some polygons are not suitable for labeling scenes, which will increase the computational complexity of other parameters. It needs to be judged to prohibit drawing.classificationAccording to the annotated scene, polygons can b ...

Posted by ohdang888 on Wed, 20 Apr 2022 16:23:04 +0300

JavaScript implementation of drag Slider Puzzle verification (html5, canvas)

Introduction: slider drag verification is now used in many places. I thought about writing one at the weekend and put it up to see if anyone can use it! effect: Realization idea: Draw the source image with a canvas, and then draw a filled square, so as to achieve the missing effect (the coordinates of the square are random);Then draw the d ...

Posted by ecco on Sat, 02 Apr 2022 15:10:36 +0300