Heim > Artikel > Web-Frontend > Eine beispielhafte Einführung in das HTML5-Canvas-Lernen
1.Erstellung eines Canvas-Tags in HTML5
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-Tag zum Zeichnen von Grafiken
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-Tag zeichnet Bilder
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"; }
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