1.HTML5中的Canvas標籤的建立
window.onload = function(){
createCanvas();
} function createCanvas(){ var canvas_width= 200, canvas_height = 200;
document.body.innerHTML = "<canvas id=\"canvas\" width=\""+canvas_width+"\" height=\""+canvas_height+"\"></canvas>";
}2.HTML5Canvas標籤繪製圖形
var canvas_width= 500, canvas_height = 500;var mycanvas, context;
window.onload = function(){
createCanvas();
drawRect();
} function createCanvas(){
document.body.innerHTML = "<canvas id=\"mycanvas\" width=\""+canvas_width+"\" height=\""+canvas_height+"\"></canvas>";
mycanvas = document.getElementById("mycanvas");
context = mycanvas.getContext("2d");
}
function drawRect(){
context.fillStyle ="#FF0000"; //context.rotate(45);//旋转45度
//context.translate(200,200);//移动
//context.scale(2,0.5);//缩放
context.fillRect(0,0,200,200);
}3.HTML5Canvas標籤繪製圖片
var canvas_width= 500, canvas_height = 500;var mycanvas, context;
window.onload = function(){
createCanvas();
drawImage();
} function createCanvas(){
document.body.innerHTML = "<canvas id=\"mycanvas\" width=\""+canvas_width+"\" height=\""+canvas_height+"\"></canvas>";
mycanvas = document.getElementById("mycanvas");
context = mycanvas.getContext("2d");
}
function drawImage(){ var img = new Image();
img.onload = function(){
context.drawImage(img,0,0);
}
img.src = "1.png";
}#
以上是HTML5 canvas學習的實例介紹的詳細內容。更多資訊請關注PHP中文網其他相關文章！
