HTML5 Canvas Fill And Stroke
Demonstrate HTML5 Canvas Fill and Stroke text effects, how to implement it based on Canvas
Now texture fill and stroke.
1: Color filling and stroke
Color filling can be achieved through fillStyle, and stroke Color can be achieved through strokeStyle. A simple example
is as follows:
// fill and stroke text ctx.font = '60pt Calibri'; ctx.lineWidth = 3; ctx.strokeStyle = 'green'; ctx.strokeText('Hello World!', 20, 100); ctx.fillStyle = 'red'; ctx.fillText('Hello World!', 20, 100);
2: Texture fill and stroke
HTML5 Canvas also supports texture filling. By loading a texture image and then creating a brush pattern, the API to create a
texture pattern is ctx.createPattern(imageTexture, "repeat");The second parameter supports four
values, respectively ”repeat-x”, ”repeat-y”, ”repeat”,”no-repeat”means that the textures are along
X axis, Y axis, XY direction repeat or not repeat. The code for texture stroke and fill is as follows:
var woodfill = ctx.createPattern(imageTexture,"repeat"); ctx.strokeStyle = woodfill; ctx.strokeText('Hello World!', 20, 200); // fill rectangle ctx.fillStyle = woodfill; ctx.fillRect(60, 240, 260, 440);
##Texture picture:
Three: Running effect
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="X-UA-Compatible" content="chrome=IE8">
<meta http-equiv="Content-type" content="text/html;charset=UTF-8">
<title>Canvas Fill And Stroke Text Demo</title>
<link href="default.css" rel="stylesheet" />
<script>
var ctx = null; // global variable 2d context
var imageTexture = null;
window.onload = function() {
var canvas = document.getElementById("text_canvas");
console.log(canvas.parentNode.clientWidth);
canvas.width = canvas.parentNode.clientWidth;
canvas.height = canvas.parentNode.clientHeight;
if (!canvas.getContext) {
console.log("Canvas not supported. Please install a HTML5 compatible browser.");
return;
}
// get 2D context of canvas and draw rectangel
ctx = canvas.getContext("2d");
ctx.fillStyle="black";
ctx.fillRect(0, 0, canvas.width, canvas.height);
// fill and stroke text
ctx.font = '60pt Calibri';
ctx.lineWidth = 3;
ctx.strokeStyle = 'green';
ctx.strokeText('Hello World!', 20, 100);
ctx.fillStyle = 'red';
ctx.fillText('Hello World!', 20, 100);
// fill and stroke by pattern
imageTexture = document.createElement('img');
imageTexture.src = "../pattern.png";
imageTexture.onload = loaded();
}
function loaded() {
// delay to image loaded
setTimeout(textureFill, 1000/30);
}
function textureFill() {
// var woodfill = ctx.createPattern(imageTexture, "repeat-x");
// var woodfill = ctx.createPattern(imageTexture, "repeat-y");
// var woodfill = ctx.createPattern(imageTexture, "no-repeat");
var woodfill = ctx.createPattern(imageTexture, "repeat");
ctx.strokeStyle = woodfill;
ctx.strokeText('Hello World!', 20, 200);
// fill rectangle
ctx.fillStyle = woodfill;
ctx.fillRect(60, 240, 260, 440);
}
</script>
</head>
<body>
<h1 id="HTML-nbsp-Canvas-nbsp-Text-nbsp-Demo-nbsp-nbsp-By-nbsp-Gloomy-nbsp-Fish">HTML5 Canvas Text Demo - By Gloomy Fish</h1>
<pre class="brush:php;toolbar:false">Fill And Stroke
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