Comment: This article will introduce the HTML5 Canvas Fill and Stroke text effects in detail. Based on Canvas, how to achieve texture filling and stroke, color filling and stroke, the specific code is as follows. Interested friends can refer to it. I hope it will be helpful to everyone.
Demonstrate HTML5 Canvas Fill and Stroke text effects, based on how Canvas implement texture filling and stroke.1: Color fill and stroke
Color filling can be achieved through fillStyle, and stroke color can be achieved through strokeStyle. Simple example
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);
Two: Texture filling and stroke
HTML5 Canvas also supports texture filling. By loading a texture image and then creating a brush pattern, the API for creating texture patterns is ctx.createPattern(imageTexture,repeat); the second parameter supports four values, namely repeat-x, repeat-y, repeat, no-repeat, meaning that the texture is repeated or not repeated along the X-axis, Y-axis, and XY directions respectively. The code for texture strokes and fills 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: Operation effect
Code:
<!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" />
<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>HTML5 Canvas Text Demo - By Gloomy Fish</h1>
<pre>Fill And Stroke</pre>
<div>
<canvas></canvas>
</div>
</body>
</html>