質問編集履歴
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修正
test
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test
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@@ -17,196 +17,6 @@
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###サンプルコード
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```JavaScript
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var canvas = document.getElementById('canvassample'),
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ctx = canvas.getContext('2d'),
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moveflg = 0,
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Xpoint,
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Ypoint,
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currentCanvas,
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temp = [];
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//初期値（サイズ、色、アルファ値）の決定
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var defSize = 7,
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defColor = "#555";
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// ストレージの初期化
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var myStorage = localStorage;
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window.onload = initLocalStorage();
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// PC対応
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canvas.addEventListener('mousedown', startPoint, false);
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canvas.addEventListener('mousemove', movePoint, false);
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canvas.addEventListener('mouseup', endPoint, false);
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// スマホ対応
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canvas.addEventListener('touchstart', startPoint, false);
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canvas.addEventListener('touchmove', movePoint, false);
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canvas.addEventListener('touchend', endPoint, false);
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function startPoint(e){
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e.preventDefault();
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ctx.beginPath();
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console.log(e.clientX);
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// 矢印の先っぽから始まるように調整
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Xpoint = e.clientX-8;
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Ypoint = e.clientY-8;
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ctx.moveTo(Xpoint, Ypoint);
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}
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function movePoint(e){
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if(e.buttons === 1 || e.witch === 1 || e.type == 'touchmove')
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{
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Xpoint = e.pageX-8;
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Ypoint = e.pageY-8;
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moveflg = 1;
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ctx.lineTo(Xpoint, Ypoint);
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ctx.lineCap = "round";
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ctx.lineWidth = defSize * 2;
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ctx.strokeStyle = defColor;
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ctx.stroke();
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}
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}
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function endPoint(e)
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{
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if(moveflg === 0)
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{
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ctx.lineTo(Xpoint-1, Ypoint-1);
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ctx.lineCap = "round";
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ctx.lineWidth = defSize * 2;
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ctx.strokeStyle = defColor;
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ctx.stroke();
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}
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moveflg = 0;
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setLocalStoreage();
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}
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function resetCanvas() {
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ctx.clearRect(0, 0, ctx.canvas.clientWidth, ctx.canvas.clientHeight);
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}
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function initLocalStorage(){
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myStorage.setItem("__log", JSON.stringify([]));
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}
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function setLocalStoreage(){
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var png = canvas.toDataURL();
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var logs = JSON.parse(myStorage.getItem("__log"));
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setTimeout(function(){
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logs.unshift({png});
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myStorage.setItem("__log", JSON.stringify(logs));
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currentCanvas = 0;
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temp = [];
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}, 0);
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}
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