288 lines
8.3 KiB
HTML
288 lines
8.3 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<script src=
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"https://cdn.jsdelivr.net/npm/html2canvas@1.0.0-rc.5/dist/html2canvas.min.js">
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</script>
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</head>
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<body>
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<div>
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<style>
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p {
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font-size: 24;
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}
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</style>
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<img />
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<button id="snapshot-button">Take snapshot</button>
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<div style="height: 50px; width: 10000px; background-color: blue;"></div>
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<!-- <img width="400px" height="700px" src="alley.jpg" /> -->
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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v
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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<p>Nice thanks man awesome</p>
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</div>
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<script type="text/javascript">
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let canvas = document.createElement("canvas");
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document.body.appendChild(canvas);
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canvas.style = "position: fixed; top: 0px; left: 0px; cursor: crosshair;";
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function setCanvasDimensions(canvas) {
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let bodyMarginLeft = window.getComputedStyle(document.body).getPropertyValue('margin-left');
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let bodyMarginRight = window.getComputedStyle(document.body).getPropertyValue('margin-right');
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if (bodyMarginLeft || bodyMarginRight) {
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canvas.width = document.body.offsetWidth + parseInt(bodyMarginLeft) + parseInt(bodyMarginRight);
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}
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else {
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canvas.width = document.body.offsetWidth;
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}
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canvas.width = window.innerWidth;
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canvas.height = window.innerHeight;
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canvas.hidden = true;
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}
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setCanvasDimensions(canvas);
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window.addEventListener("resize", () => setCanvasDimensions(canvas))
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let ctx = canvas.getContext("2d");
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let hiddenCanvas = document.createElement("canvas");
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document.body.appendChild(hiddenCanvas);
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hiddenCanvas.hidden = true;
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let hiddenCtx = hiddenCanvas.getContext("2d");
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let initialX;
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let initialY;
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let isDown = false;
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function onMouseDown(e) {
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e.preventDefault();
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e.stopPropagation();
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initialX = e.offsetX;
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initialY = e.offsetY;
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isDown = true;
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this.setPointerCapture(e.pointerId);
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}
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function onMouseMove(e) {
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e.preventDefault();
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e.stopPropagation();
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if (isDown) {
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let offsetX;
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let offsetY;
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if (e.offsetX < 0) {
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offsetX = 0;
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}
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else if (e.offsetX > canvas.width - 1) {
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offsetX = canvas.width - 1;
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}
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else {
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offsetX = e.offsetX;
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}
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if (e.offsetY < 0) {
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offsetY = 0;
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}
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else if (e.offsetY > canvas.height - 1) {
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offsetY = canvas.height - 1;
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}
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else {
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offsetY = e.offsetY;
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}
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let width = offsetX - initialX;
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let height = offsetY - initialY;
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setCanvas();
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ctx.beginPath();
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ctx.clearRect(initialX, initialY, width, height);
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ctx.rect(initialX, initialY, width, height);
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ctx.stroke();
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ctx.closePath();
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}
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}
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async function onMouseUp(e) {
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e.preventDefault();
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e.stopPropagation();
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if (isDown) {
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let offsetX;
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let offsetY;
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if (e.offsetX < 0) {
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offsetX = 0;
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}
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else if (e.offsetX > canvas.width - 1) {
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offsetX = canvas.width - 1;
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}
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else {
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offsetX = e.offsetX;
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}
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if (e.offsetY < 0) {
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offsetY = 0;
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}
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else if (e.offsetY > canvas.height - 1) {
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offsetY = canvas.height - 1;
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}
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else {
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offsetY = e.offsetY;
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}
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unloadCanvas();
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this.releasePointerCapture(e.pointerId);
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if (Math.abs(offsetX - initialX) > 10 && Math.abs(offsetY - initialY) > 10) {
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await takeScreenshot(offsetX, offsetY);
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}
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initialX = null;
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initialY = null;
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isDown = false;
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}
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}
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function onMouseLeave(e) {
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e.preventDefault();
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e.stopPropagation();
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if (isDown) {
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}
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}
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async function takeScreenshot(offsetX, offsetY) {
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let width = offsetX - initialX;
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let height = offsetY - initialY;
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let offsetInitialX = initialX;
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let offsetInitialY = initialY;
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if (width < 0) {
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width = width * -1;
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offsetInitialX = initialX - width;
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}
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if (height < 0) {
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height = height * -1;
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offsetInitialY = initialY - height;
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}
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let documentCanvas;
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await html2canvas(document.body, {
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logging: true,
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letterRendering: 1,
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allowTaint: true,
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useCORS: true
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}).then(
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function (canvas) {
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console.log("nice")
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documentCanvas = canvas;
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});
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return;
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hiddenCanvas.width = width;
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hiddenCanvas.height = height;
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hiddenCtx.drawImage(documentCanvas, offsetInitialX, offsetInitialY, width, height, 0, 0, width, height);
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let base64image = canvas.toDataURL("image/png");
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console.log(base64image);
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hiddenCtx.clearRect(0, 0, hiddenCanvas.width, hiddenCanvas.height);
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hiddenCanvas.width = 0;
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hiddenCanvas.height = 0;
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}
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function setCanvas() {
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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ctx.globalAlpha = 0.5;
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ctx.fillStyle = "white";
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ctx.beginPath();
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ctx.rect(0, 0, canvas.width, canvas.height);
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ctx.fill();
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ctx.closePath();
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setBrush();
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}
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function setBrush() {
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ctx.globalAlpha = 1;
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ctx.strokeStyle = 'red';
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}
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canvas.addEventListener("pointerdown", onMouseDown);
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canvas.addEventListener("pointermove", onMouseMove);
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canvas.addEventListener("pointerleave", onMouseLeave);
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canvas.addEventListener("pointerup", onMouseUp);
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function loadCanvas() {
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setCanvas();
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canvas.hidden = false;
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}
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function unloadCanvas() {
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setCanvas();
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canvas.hidden = true;
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}
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let snapshotButton = document.getElementById("snapshot-button");
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snapshotButton.addEventListener("click", () => { loadCanvas() });
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</script>
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</body>
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</html> |