HTML5旋转图片
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <script src="CanvasModule.js" type="text/javascript" charset="utf-8"></script> <title>旋转跳跃</title> </head> <script type="text/javascript" > if (document.all) { window.attachEvent(‘onload‘, load); } else { window.addEventListener(‘load‘, load, false); } //globle var CanvasImageItems=new Array(); var BackgroundDraw; var TargetCanvas; var startMx=0; var startMy=0; var startDrgx; var startDrgy; var selectTmp=new Array(); function load(){ //添加键盘处理事件 window.addEventListener("keydown", onKeyDown, false); window.addEventListener("keyup", onKeyUp, false); TargetCanvas=document.getElementById("MyCanvas"); TopCanvas=document.getElementById("topCanvas"); var imgs=document.getElementsByTagName("img"); BackgroundDraw =TargetCanvas.getContext("2d"); TopDraw=TopCanvas.getContext("2d"); for(i=0;i<imgs.length;i++){ var item=new CanvasImage(); item._oElement=imgs[i]; item.left=i*123; item.top=0; item.tmpleft=i*123; item.tmptop=0; item.width=imgs[i].width; item.height=imgs[i].height; CanvasImageItems[i]=item; drawBackgrdCanvasImg(CanvasImageItems[i]); } TargetCanvas.onmousedown=mouseDownHandler; TargetCanvas.onmouseup=mouseUpHandler; TargetCanvas.onmousemove=mouseMoveHandler; TopCanvas.onmousedown=TopmouseMoveHandler; TopCanvas.onmouseup=TopmouseUpHandler; TopCanvas.onmousemove=TopmouseMoveHandler; } var MousePositon=function(){ var objTop = getOffsetTop(document.getElementById("MyCanvas"));//对象x位置 var objLeft = getOffsetLeft(document.getElementById("MyCanvas"));//对象y位置 return { mouseX:event.clientX+document.body.scrollLeft-objLeft,//鼠标x位置 mouseY:event.clientY+document.body.scrollTop-objTop//鼠标y位置 } } function getOffsetTop(obj){ var tmp = obj.offsetTop; var val = obj.offsetParent; while(val != null){ tmp += val.offsetTop; val = val.offsetParent; } return tmp; } function getOffsetLeft(obj){ var tmp = obj.offsetLeft; var val = obj.offsetParent; while(val != null){ tmp += val.offsetLeft; val = val.offsetParent; } return tmp; } function isChoosed(){ var re=-1; for(i=0;i<CanvasImageItems.length;i++) { cimg=CanvasImageItems[i]; TopDraw.translate(cimg.left+cimg.width/2,cimg.top+cimg.height/2); TopDraw.rotate(cimg.angle * Math.PI / 180); TopDraw.beginPath(); TopDraw.rect(-cimg.width/2,-cimg.height/2,cimg.width,cimg.height); var mp=MousePositon(); if(TopDraw.isPointInPath(mp.mouseX,mp.mouseY)) { TopDraw.stroke(); re=i; document.getElementById("selectedone").innerHTML =re; TopDraw.rotate(-cimg.angle * Math.PI / 180); TopDraw.translate(-cimg.left-cimg.width/2,-cimg.top-cimg.height/2); break; } TopDraw.rotate(-cimg.angle * Math.PI / 180); TopDraw.translate(-cimg.left-cimg.width/2,-cimg.top-cimg.height/2); } TopDraw.closePath(); TopDraw.clearRect(0,0,1000,600); TopDraw.restore(); return re; } function mouseMoveHandler(){ var mp=MousePositon(); document.getElementById("mousePosition").innerHTML =mp.mouseX+","+mp.mouseY; } function mouseDownHandler(){ TopDraw.clearRect(0,0,1000,600); var mp=MousePositon(); startMx=mp.mouseX; startMy=mp.mouseY; var selected= isChoosed(); if(selected>-1) { document.getElementById("topCanvas").style.zIndex=2; CanvasImageItems[selected].selected=true;//=CanvasImageItems[selected].selected==true?false:true; } else { for(i in CanvasImageItems ){ if(CanvasImageItems[i].selected==true) { CanvasImageItems[i].selected=false; } } redrawAllBt(); return ; } refreshBackground(); for(i=0;i<CanvasImageItems.length;i++){ CanvasImageItems[i].tmpleft=CanvasImageItems[i].left; CanvasImageItems[i].tmptop=CanvasImageItems[i].top; } TopmouseMoveHandler(); console.log("bt down mouse"); } function mouseUpHandler(){ console.log("bt up mouse"); } function TopmouseMoveHandler(){ if(selectTmp==null) return ; TopDraw.clearRect(0,0,1000,600); var mp=MousePositon(); document.getElementById("mousePosition").innerHTML =mp.mouseX+","+mp.mouseY; redrawTopRect(1000,600); //console.log("top mouse move"); } function TopmouseUpHandler(){ document.getElementById("topCanvas").style.zIndex=0; TopDraw.clearRect(0,0,1000,600); redrawAllBt(); console.log("top up mouse"); } function redrawTopRect(RECT_WIDTH,RECT_HEIGHT){ TopDraw.clearRect(0,0,1000,600); var mp=MousePositon(); for(i in CanvasImageItems ){ if(CanvasImageItems[i].selected==true) { drawTopCanvasImg(CanvasImageItems[i]); CanvasImageItems[i].tmpleft=CanvasImageItems[i].left+mp.mouseX-startMx; CanvasImageItems[i].tmptop=CanvasImageItems[i].top+mp.mouseY-startMy; } } } function redrawAllBt(){ BackgroundDraw.clearRect(0,0,1000,600); var imgs=document.getElementsByTagName("img"); for(i=0;i<CanvasImageItems.length;i++){ CanvasImageItems[i].left=CanvasImageItems[i].tmpleft; CanvasImageItems[i].top=CanvasImageItems[i].tmptop; drawBackgrdCanvasImg(CanvasImageItems[i]); } } function drawTopCanvasImg(cimg){ TopDraw.translate(cimg.tmpleft+cimg.width/2,cimg.tmptop+cimg.height/2); TopDraw.rotate(cimg.angle * Math.PI / 180); TopDraw.drawImage(cimg._oElement,-cimg.width/2,-cimg.height/2,cimg.width,cimg.height); if(cimg.selected==true){ TopDraw.beginPath(); TopDraw.rect(-cimg.width/2-1,-cimg.height/2-1,cimg.width+2,cimg.height+2); TopDraw.stroke(); TopDraw.closePath(); } TopDraw.rotate(-cimg.angle * Math.PI / 180); TopDraw.translate(-cimg.tmpleft-cimg.width/2,-cimg.tmptop-cimg.height/2); TopDraw.restore(); } function drawBackgrdCanvasImg(cimg){ BackgroundDraw.translate(cimg.left+cimg.width/2,cimg.top+cimg.height/2); BackgroundDraw.rotate(cimg.angle * Math.PI / 180); BackgroundDraw.drawImage(cimg._oElement,-cimg.width/2,-cimg.height/2,cimg.width,cimg.height); if(cimg.selected==true){ BackgroundDraw.beginPath(); BackgroundDraw.rect(-cimg.width/2-1,-cimg.height/2-1,cimg.width+2,cimg.height+2); BackgroundDraw.stroke(); BackgroundDraw.closePath(); } BackgroundDraw.rotate(-cimg.angle * Math.PI / 180); BackgroundDraw.translate(-cimg.left-cimg.width/2,-cimg.top-cimg.height/2); BackgroundDraw.restore(); } function refreshBackground(){ BackgroundDraw.clearRect(0,0,1000,600); for(i=0;i<CanvasImageItems.length;i++) { if(CanvasImageItems[i].selected==false) drawBackgrdCanvasImg(CanvasImageItems[i]); } } function onKeyDown(evt) { refreshBackground(); TopDraw.clearRect(0,0,1000,600); if(evt.keyCode=="39") { document.getElementById("topCanvas").style.zIndex=2; for(i in CanvasImageItems ) { if(CanvasImageItems[i].selected==true){ CanvasImageItems[i].angle+=10; if( CanvasImageItems[i].angle>360) CanvasImageItems[i].angle=0; drawTopCanvasImg(CanvasImageItems[i]); } } } else if(evt.keyCode==‘37‘) { document.getElementById("topCanvas").style.zIndex=2; for(i in CanvasImageItems ) { if(CanvasImageItems[i].selected==true){ CanvasImageItems[i].angle-=10; if( CanvasImageItems[i].angle<-360) CanvasImageItems[i].angle=0; drawTopCanvasImg(CanvasImageItems[i]); } } } } function onKeyUp(evt){ document.getElementById("topCanvas").style.zIndex=0; redrawAllBt(); } </script> <body> <canvas id="MyCanvas" class="main" width="1000" height="600" style="background:grey;position:absolute;left:200px;top:0px;z-index:1;"> </canvas> <canvas id="topCanvas" class="main" width="1000" height="600" style="background:transparent;position:absolute;left:200px;top:0px;z-index:0;"> </canvas> <div style="margin:600px">鼠标位置 <span id="mousePosition"></span>选中<span id="selectedone"></span> <img src="img1.jpg" width="103px" height="163px" border="0" alt=""> <img src="img2.jpg" width="103px" height="163px" border="0" alt=""> <img src="img3.jpg" width="103px" height="163px" border="0" alt=""> <img src="img4.jpg" width="103px" height="163px" border="0" alt=""> </div> </body> </html> function CanvasImage() { CanvasImage.prototype._oElement = null; CanvasImage.prototype.top = 0; CanvasImage.prototype.left = 0; CanvasImage.prototype.tmptop =0; CanvasImage.prototype.tmpleft =0; CanvasImage.prototype.width = 0; CanvasImage.prototype.height = 0; CanvasImage.prototype.oCoords = null; CanvasImage.prototype.angle =-10; CanvasImage.prototype.theta = 0; CanvasImage.prototype.scalex = 1; CanvasImage.prototype.scaley = 1; CanvasImage.prototype.cornersize = null; CanvasImage.prototype.polaroidheight = null; CanvasImage.prototype.randomposition = null; CanvasImage.prototype.selected = false; CanvasImage.prototype.bordervisibility = false; CanvasImage.prototype.cornervisibility = false; } }
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