web前端|js教程
JavaScript+html5,canvas,js
web前端-js教程
1. html
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2. javascript
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var photoW = 400;var photoH = 300;var photo;// logic load image into canvas// ...// e.g.// photo = new Image();// photo.onload = function() {// draw photo into canvas when ready// ctx.drawImage(photo, 0, 0, photoW, photoH);// };// load photo into canvas// photo.src = picURL;// canvas highlightvar canvas = document.getElementById(canvasFile), ctx = canvas.getContext(2d), img = new Image;var btnDone = document.getElementById(tnDone);var btnRedo = document.getElementById(tnRedo); ctx.strokeStyle = #FF0000;function DrawDot(x, y) { var centerX = x; var centerY = y; var radius = 2; ctx.beginPath(); ctx.arc(centerX, centerY, radius, 0, 2 * Math.PI, false); ctx.fillStyle = ed; ctx.fill(); ctx.lineWidth = 2; ctx.strokeStyle = #FF0000; ctx.stroke();} function startDrawing() { ctx.drawImage(img, 0, 0, photoW, photoH); canvas.onmousemove = mousemoving; canvas.onmousedown = mousedownhandle; canvas.onmouseup = mouseuphandle; // ## mobile events //touchstart – to toggle drawing mode “on” //touchend – to toggle drawing mode “off” //touchmove – to track finger position, used in drawing canvas.addEventListener( ouchmove, touchmove, false); canvas.addEventListener( ouchend, mouseuphandle, false); btnRedo.onclick = function (e) { ctx.clearRect(0, 0, ctx.width, ctx.height); ctx.drawImage(photo, 0, 0, photoW, photoH); savedrawing(); }}function savedrawing(e) { var image = document.getElementById(canvasFile).toDataURL("image/jpeg"); image = image.replace(data:image/jpeg;base64,, \); $("#imgNric1").val(image);};function mousemoving(e) { if (drawing) { mousedownhandle(e); }} var drawing = false; function mousedownhandle(e) { drawing = true; var r = canvas.getBoundingClientRect(), x = e.clientX - r.left, y = e.clientY - r.top; DrawDot(x, y);} function mouseuphandle(e) { savedrawing(); e.preventDefault(); drawing = false; } //// mobile touch eventsfunction touchmove(e) { if (e.clientX > 800) { mousedownhandle(e); return; } var r = canvas.getBoundingClientRect(), //event.changedTouches[0].pageX + ":" + event.changedTouches[0].pageY; x = e.changedTouches[0].pageX - r.left, y = e.changedTouches[0].pageY - r.top; DrawDot(x, y); e.preventDefault();}
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