SVG-based web page graphics drawing API introduction and programming demonstration_javascript skills

1: What is SVG
SVG is a 2D graphics description language released by W3C in 1999. It is a markup language purely based on XML format. The full name of SVG
is scalable vector graphics and traditional Raster There is a big difference
in the format of graphics (JPG, PNG, GIF, etc.). SVG is a 2D graphics development platform, including two parts, one is data description based on XML language, and the other part is a programmable API. Its key features support graphics, text, gradient fill, brush style, graphics
Special effect filters such as Gaussian blur will be demonstrated in the code later. It also supports various mouse events and DOM part
API. Almost all mainstream browsers support the rendering and rendering of SVG graphics format. IE9 and above also begin to
support SVG. In lower versions of IE, plug-in support is required.
To learn more about SVG, visit here: http://www.w3.org/Graphics/SVG/About.html


Two: SVG API programming demonstration in JavaScript Create and obtain SVG object

Copy code The code is as follows:

// create svg object
var mySvg = document.createElementNS("http://www.w3.org/2000/svg","svg");
mySvg.setAttribute("version","1.2");// IE9 support SVG 1.1 version
mySvg.setAttribute("baseProfile","tiny");
container.appendChild(mySvg);

Create a rectangular shape in SVG:

Copy code The code is as follows:

var c1 = document.createElementNS("http://www.w3.org /2000/svg","rect");
c1.setAttribute("x","20");
c1.setAttribute("y","20");
c1.setAttribute( "width","150");
c1.setAttribute("height","150");
c1.setAttribute("fill","rgb(0,0,255)");
c1 .setAttribute("stroke","rgb(0,0,0)");
c1.setAttribute("stroke-width","4");
mySvg.appendChild(c1);

Implement text drawing in SVG:

Copy code The code is as follows:

// SVG draw text
var stext = document.createElementNS("http://www.w3.org/2000/svg","text");
stext.setAttribute("x","700 ");
stext.setAttribute("y","100");
stext.setAttribute("font-size","18px");
stext.setAttribute("fill","# FF0000");
var textString = document.createTextNode("Hello SVG");
stext.appendChild(textString);
mySvg.appendChild(stext);

at Implement mouse click event processing and MouseUp event processing on SVG objects:

Copy code The code is as follows:

// mouse event handling
c1.addEventListener("click",changeColor,false);
c2.addEventListener("mouseup", changeColor,false);

Via SVG graphics Filter to implement Gaussian blur:

Copy code The code is as follows:

< feGaussianBlur in="SourceGraphic" stdDeviation="5" />

Running effect:

Source code, you can copy and run directly
JavaScript part

Copy Code The code is as follows:

window.onload = function() {
// get DIV
var container = document.getElementById("svgContainer");
// create svg object
var mySvg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
mySvg.setAttribute("version", "1.2");// IE9 support SVG 1.1 version
mySvg.setAttribute("baseProfile", "tiny");
container.appendChild(mySvg);

// create svg shape - rectangle
var c1 = document.createElementNS("http://www.w3.org/2000/svg", "rect");
c1.setAttribute("x", "20");
c1.setAttribute("y", "20");
c1.setAttribute("width", "150");
c1.setAttribute("height", "150");
c1.setAttribute("fill", "rgb(0,0,255)");
c1.setAttribute("stroke", "rgb(0,0,0)");
c1.setAttribute("stroke-width", "4");
mySvg.appendChild(c1);

// create svg shape - circle
var c2 = document.createElementNS("http://www.w3.org/2000/svg", "circle");
c2.setAttribute("cx", "250");
c2.setAttribute("cy", "100");
c2.setAttribute("r", "60");
c2.setAttribute("fill", "#996699");
c2.setAttribute("stroke", "#AA99FF");
c2.setAttribute("stroke-width", "7");
mySvg.appendChild(c2);

// create svg shape - ellipse
var c3 = document.createElementNS("http://www.w3.org/2000/svg", "ellipse");
c3.setAttribute("cx", "450");
c3.setAttribute("cy", "100");
c3.setAttribute("rx", "100");
c3.setAttribute("ry", "50");
c3.setAttribute("fill", "#FF0000");
c3.setAttribute("stroke", "purple");
c3.setAttribute("stroke-width", "3");
mySvg.appendChild(c3);

// create svg shape - draw lines
for(var i=0; i<10; i )
{
var sline = document.createElementNS("http://www.w3.org/2000/svg", "line");
var x1 = 580 i*10;
console.log(x1);

sline.setAttribute("x1", x1.toString());
sline.setAttribute("y1", "10");
sline.setAttribute("x2", x1.toString());
sline.setAttribute("y2", "180");
sline.setAttribute("stroke", "rgb(0,255,0)");
sline.setAttribute("stroke-width", "2");
mySvg.appendChild(sline);
}

// SVG draw text
var stext = document.createElementNS("http://www.w3.org/2000/svg", "text");
stext.setAttribute("x", "700");
stext.setAttribute("y", "100");
stext.setAttribute("font-size", "18px");
stext.setAttribute("fill", "#FF0000");
var textString = document.createTextNode("Hello SVG");
stext.appendChild(textString);
mySvg.appendChild(stext);

// mouse event handling
c1.addEventListener("click", changeColor, false);
c2.addEventListener("mouseup", changeColor, false);
};
function changeColor(evt) {
var target = evt.target;
target.setAttributeNS(null, "fill", "green");
}

HTML部分：

复制代码 代码如下:

Statement of this Website

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

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

AI Hentai Generator

Generate AI Hentai for free.

Show More

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)

3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

R.E.P.O. Best Graphic Settings

3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Assassin's Creed Shadows: Seashell Riddle Solution

2 weeks ago By DDD

R.E.P.O. How to Fix Audio if You Can't Hear Anyone

3 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

WWE 2K25: How To Unlock Everything In MyRise

4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Show More

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)

Show More

Hot Topics

Where is the login entrance for gmail email?

7490

15

CakePHP Tutorial

1377

52

What is the format of the account name of steam

77

11

win11 activation key permanent

52

19

nyt connections hints and answers

19

41

Show More