90 lines
2.9 KiB
HTML
90 lines
2.9 KiB
HTML
<!doctype html>
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<html>
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<head>
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<title>Canvas HTML5</title>
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<style>
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#canvas {
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border: 1px solid black;
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}
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</style>
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</head>
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<body>
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<canvas id="canvas" width="600" height="400"></canvas>
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<div>
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<button class="save">Save</button>
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<button class="clear">clear</button>
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<span>Color: <input type="color" value="#ffff00" id="penColor"></span>
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<span>Width: <input type="range" min="1" max="20" value="10" id="penWidth"></span>
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</div>
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<div class="output"></div>
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<script>
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const canvas = document.querySelector("#canvas");
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const ctx = canvas.getContext("2d");
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const penColor = document.querySelector("#penColor");
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const penWidth = document.querySelector("#penWidth");
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const btnSave = document.querySelector(".save");
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const btnClear = document.querySelector(".clear");
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const output = document.querySelector(".output");
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const mLoc = {
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draw: false,
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x: 0,
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y: 0,
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lastX: 0,
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lastY: 0
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};
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canvas.style.border = "1px solid black";
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btnSave.addEventListener("click", saveImg);
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btnClear.addEventListener("click", clearCanvas);
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canvas.addEventListener("mousemove", (e) => {
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mLoc.lastX = mLoc.x;
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mLoc.lastY = mLoc.y;
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//console.log(e);
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mLoc.x = e.clientX;
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mLoc.y = e.clientY;
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draw();
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});
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canvas.addEventListener("mousedown", (e) => {
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mLoc.draw = true;
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});
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canvas.addEventListener("mouseup", (e) => {
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mLoc.draw = false;
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});
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canvas.addEventListener("mouseout", (e) => {
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mLoc.draw = false;
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});
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function saveImg() {
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const dataURL = canvas.toDataURL();
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console.log(dataURL);
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const img = document.createElement("img");
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output.prepend(img);
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img.setAttribute("src", dataURL);
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const link = document.createElement("a");
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output.append(link);
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let fileName = Math.random().toString(16).substr(-8) + ".png"
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link.setAttribute("download", fileName);
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link.href = dataURL;
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link.click();
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output.removeChild(link);
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}
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function clearCanvas() {
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let temp = confirm("clear canvas?");
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if (temp) {
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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}
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}
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function draw() {
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if (mLoc.draw) {
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ctx.beginPath();
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ctx.moveTo(mLoc.lastX, mLoc.lastY);
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ctx.lineTo(mLoc.x, mLoc.y);
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ctx.strokeStyle = penColor.value;
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ctx.lineWidth = penWidth.value;
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ctx.stroke();
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ctx.closePath();
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}
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}
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</script>
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</body>
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</html>
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