Exemples d'utilisation du canevas HTML5 _Compétences du didacticiel HTML5

Copier le code Le code est le suivant : HTML5示例 #container{border:1px solid #ccc;width:800px;height:600px;position:relative;} canvas{position:absolute;top:0px;left:0px;z-index:1;} 铅笔 直线 矩形 圆形 椭圆 var canvas = document.getElementById('canvas'); var context = canvas.getContext('2d'); var _canvas = document.getElementById('canvas_temp'); var _context = _canvas.getContext('2d'); var tools= document.getElementById('tools'); tools.onchange = function (e){ outil[this. value](); }; var tool = { pen:function (){ this.reset(); _canvas.onmousedown=function (e){ _context.moveTo(e.layerX,e.layerY); _canvas.onmousemove=function (e){ _context.lineTo(e.layerX,e.layerY); _context.stroke(); }; _canvas.onmouseup=function (e){ _canvas.onmousemove=null; _canvas.onmouseup=null; tool.updata(); }; }; }, line:function (){ this.reset(); _canvas.onmousedown=function (e){ var _e = e; _canvas.onmousemove=function (e){ _context.clearRect(0,0,canvas.width,canvas.height); _context.beginPath(); _context.moveTo(_e. layerX,_e.layerY); _context.lineTo(e.layerX,e.layerY); _context.Stroke(); _context.closePath(); }; _canvas.onmouseup=function (e){ _canvas.onmousemove=null; _canvas.onmouseup=null; tool.updata(); }; } }, rect:function (){ this.reset(); _canvas.onmousedown=function (e){ var _e = e; _context.StrokeStyle="#000"; _canvas.onmousemove=function (e){ _context.clearRect(0,0,canvas.width,canvas.height); _context.StrokeRect(_e. layerX,_e.layerY,e.layerX-_e.layerX,e.layerY-_e.layerY); }; _canvas.onmouseup=function (e){ _canvas.onmousemove=null; _canvas.onmouseup=null; tool.updata(); }; } }, circle:function (){ this.reset(); _canvas.onmousedown=function (e){ var _e = e; _canvas.onmousemove=function (e){ _context.clearRect(0,0,canvas.width,canvas.height); _context.beginPath(); _context.arc(_e.layerX,_e .layerY,e.layerX-_e.layerX,0,Math.PI*2,true); _context.Stroke(); _context.closePath(); }; _canvas. onmouseup=function (e){ _canvas.onmousemove=null; _canvas.onmouseup=null; tool.updata(); }; } }, ellipse:function (){ this.reset(); _canvas.onmousedown=function (e){ var _e = e; _canvas.onmousemove=function (e){ var st=0; _context.clearRect(0,0,canvas.width,canvas.height); _context.beginPath(); _context.moveTo(_e.layerX (e.layerX-_e.layerX)*Math.cos(st), _e.layerY (e.layerX-_e.layerX)*Math.sin(st)); st =1/180*Math.PI ; for(var i=0;i _context.lineTo(_e.layerX (e.layerX-_e.layerX)*Math.cos(st),_e.layerY (e. layerY-_e.layerY)*Math.sin(st)); st =1/180*Math.PI; } _context.Stroke(); _context.closePath(); }; _canvas.onmouseup=function (e){ _canvas.onmousemove=null; _canvas.onmouseup=null; tool.updata(); }; } }, reset:function (){ _canvas.onmousedown=null; _canvas.onmouseup=null; _canvas.onmousemove=null; }, updata:function (){ context.drawImage(_canvas, 0, 0); _context.clearRect(0, 0, canvas.width, canvas.height); } }; outil['stylo']();

Exemples d'utilisation du canevas HTML5 _Compétences du didacticiel HTML5

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