crop 相关问题

裁剪是指与裁剪图像有关的任何问题。

我希望画布的高度和宽度在旋转图像时发生变化并相应地工作，并且叠加层也应适合旋转的画布，并且裁剪应相应地工作。我希望画布的高度和宽度在旋转图像时发生变化并相应地工作，并且叠加层也应适合旋转的画布，并且裁剪应相应地工作。 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Image Cropper</title> <link rel="stylesheet" href="https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css"> <style> html, body { background: black; margin: 0; padding: 0; height: 90%; } .image-container { position: relative; min-height: 80%; display: flex; align-items: center; justify-content: center; margin: auto; overflow: visible; /* background-color: #f8f9fa; */ } /* @media (max-width: 480px) { .image-container { min-height: 60vh; } } */ #canvas { display: block; max-width: 100%; max-height: 100%; margin: auto; /* background-color: white; */ } .main-div { padding-top: 5%; width: 100%; height: 100%; background: black; } .overlay { position: absolute; border: 2px solid yellow; cursor: move; touch-action: none; z-index: 1; } .ui-resizable-handle { background-image: none; } .corner { position: absolute; width: 15px; height: 15px; background-color: yellow; border-radius: 50%; } .corner.top-left { top: -5px; left: -5px; } .corner.top-right { top: -5px; right: -5px; } .corner.bottom-left { bottom: -5px; left: -5px; } .corner.bottom-right { bottom: -5px; right: -5px; } .overlay-background { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.5); /* Default opacity for rectangle */ pointer-events: none; } .rotate-buttons { margin-top: 10px; } </style> </head> <body> <div class="main-div"> <button id="cropButton">Crop</button> <select id="shapeSelect" onchange="selectShape()"> <option value="rectangle" selected>Rectangle</option> <option value="circle">Circle</option> </select> <div class="rotate-buttons"> <button onclick="rotateClockwise()">Rotate Clockwise</button> <button onclick="rotateCounterClockwise()">Rotate Counter Clockwise</button> </div> <div class="image-container"> <div class="overlay-background"></div> <canvas id="canvas"></canvas> <div class="overlay"> <div class="corner top-left"></div> <div class="corner top-right"></div> <div class="corner bottom-left"></div> <div class="corner bottom-right"></div> </div> </div> <div id="croppedImagePreview"></div> </div> <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>  <script> document.addEventListener('DOMContentLoaded', function() { const canvas = document.getElementById("canvas"); const ctx = canvas.getContext("2d"); const imageObj = new Image(); const overlay = document.querySelector('.overlay'); const overlayBackground = document.querySelector('.overlay-background'); const croppedCanvas = document.createElement("canvas"); const croppedCtx = croppedCanvas.getContext("2d"); let selectedShape = "rectangle"; let rotation = 0; // Initial rotation angle // Define selectShape function to fix the Uncaught ReferenceError window.selectShape = function() { selectedShape = document.getElementById("shapeSelect").value; console.log(selectedShape); // Adjust overlay style based on selected shape overlay.style.borderRadius = selectedShape === "circle" ? "50%" : "0%"; // Adjust border radius for circle // Adjust overlay background opacity based on selected shape if (selectedShape === "circle") { overlayBackground.style.backgroundColor = "rgba(0, 0, 0, 0.5)"; // 50% opacity for circle } else { overlayBackground.style.backgroundColor = "rgba(0, 0, 0, 0.7)"; // Higher opacity for rectangle } }; // Function to rotate the image clockwise window.rotateClockwise = function() { rotation += 90; drawRotatedImage(); }; // Function to rotate the image counter-clockwise window.rotateCounterClockwise = function() { rotation -= 90; drawRotatedImage(); }; function drawRotatedImage() { const originalWidth = imageObj.naturalWidth; const originalHeight = imageObj.naturalHeight; const is90Or270 = Math.abs(rotation % 360) === 90 || Math.abs(rotation % 360) === 270; // Set canvas size based on rotation if (is90Or270) { canvas.width = originalHeight; canvas.height = originalWidth; } else { canvas.width = originalWidth; canvas.height = originalHeight; } ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.save(); ctx.translate(canvas.width / 2, canvas.height / 2); ctx.rotate(rotation * Math.PI / 180); ctx.drawImage(imageObj, -originalWidth / 2, -originalHeight / 2, originalWidth, originalHeight); ctx.restore(); // Update the overlay to match the new dimensions initializeOverlay(); } imageObj.onload = function() { const container = document.querySelector('.image-container'); const ratio = Math.min(container.clientWidth / imageObj.naturalWidth, container.clientHeight / imageObj.naturalHeight); const imageWidth = imageObj.naturalWidth * ratio; const imageHeight = imageObj.naturalHeight * ratio; canvas.width = imageObj.naturalWidth; canvas.height = imageObj.naturalHeight; canvas.style.width = `${imageWidth}px`; canvas.style.height = `${imageHeight}px`; container.style.width = `${imageWidth}px`; container.style.height = `${imageHeight}px`; ctx.drawImage(imageObj, 0, 0, imageObj.naturalWidth, imageObj.naturalHeight); initializeOverlay(); }; imageObj.crossOrigin = "Anonymous"; imageObj.src = 'rope41.png'; // Make sure the path is correct function initializeOverlay() { const container = document.querySelector('.image-container'); const ratio = Math.min(container.clientWidth / imageObj.naturalWidth, container.clientHeight / imageObj.naturalHeight); const imageWidth = imageObj.naturalWidth * ratio; const imageHeight = imageObj.naturalHeight * ratio; var tempImageWidth = imageWidth - 4; //Adjusting width the initial overlay to fit properly in pixels var tempImageHeight = imageHeight - 3; //Adjusting height the initial overlay to fit properly pixels overlay.style.width = `${tempImageWidth}px`; overlay.style.height = `${tempImageHeight}px`; // Center the overlay overlay.style.top = `${(container.clientHeight - imageHeight) / 2}px`; overlay.style.left = `${(container.clientWidth - imageWidth) / 2}px`; $(overlay).resizable({ containment: "parent", handles: 'n, e, s, w, ne, se, sw, nw', minWidth: 100, // Setting minimum width for resizing minHeight: 100, // Setting minimum height for resizing resize: function(event, ui) { updateOverlayBackground(ui.position, ui.size); } }).draggable({ containment: "parent", drag: function(event, ui) { // Get the current dimensions using jQuery const currentWidth = $(overlay).width(); const currentHeight = $(overlay).height(); // Create a size object to pass to the update function const size = { width: currentWidth, height: currentHeight }; updateOverlayBackground(ui.position, size); } }); updateOverlayBackground({ top: overlay.style.top, left: overlay.style.left }, { width: tempImageWidth, height: tempImageHeight }); } function updateOverlayBackground(position, size) { // Corrected to ensure position and size are correctly parsed as numbers const left = parseFloat(position.left) || 0; // Added default value to prevent undefined const top = parseFloat(position.top) || 0; // Added default value to prevent undefined const width = parseFloat(size.width) || 0; // Added default value to prevent undefined const height = parseFloat(size.height) || 0; // Added default value to prevent undefined overlayBackground.style.clipPath = `polygon( 0 0, 0 100%, ${left}px 100%, ${left}px ${top}px, ${left + width}px ${top}px, ${left + width}px ${top + height}px, ${left}px ${top + height}px, ${left}px 100%, 100% 100%, 100% 0 )`; } document.getElementById('cropButton').addEventListener('click', cropImage); function cropImage() { const selectedShape = document.getElementById("shapeSelect").value; const canvasRect = canvas.getBoundingClientRect(); const bounds = overlay.getBoundingClientRect(); const scaleX = canvas.width / canvasRect.width; const scaleY = canvas.height / canvasRect.height; const cropX = (bounds.left - canvasRect.left) * scaleX; const cropY = (bounds.top - canvasRect.top) * scaleY; const cropWidth = bounds.width * scaleX; const cropHeight = bounds.height * scaleY; croppedCanvas.width = cropWidth; croppedCanvas.height = cropHeight; if (selectedShape === "rectangle") { croppedCtx.drawImage(canvas, cropX, cropY, cropWidth, cropHeight, 0, 0, cropWidth, cropHeight); } else if (selectedShape === "circle") { let rx = cropWidth / 2; // Radius along x-axis let ry = cropHeight / 2; // Radius along y-axis let cx = rx; // Center along x-axis let cy = ry; // Center along y-axis croppedCtx.save(); // Save the current context state croppedCtx.beginPath(); croppedCtx.translate(cx, cy); // Translate to the center of the ellipse croppedCtx.scale(1, ry / rx); // Scale to make the circle an ellipse croppedCtx.arc(0, 0, rx, 0, Math.PI * 2); croppedCtx.closePath(); croppedCtx.restore(); // Restore the previous context state croppedCtx.clip(); croppedCtx.drawImage( canvas, cropX, cropY, cropWidth, cropHeight, 0, 0, cropWidth, cropHeight ); } const imgPreview = document.getElementById('croppedImagePreview'); imgPreview.innerHTML = ''; const img = new Image(); img.src = croppedCanvas.toDataURL("image/png"); console.log(img.src); imgPreview.appendChild(img); } }); </script> </body> </html> 旋转时，我需要画布也旋转，并在旋转的图像上进行裁剪。我尝试根据旋转切换画布的高度和宽度，但没有成功。 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Image Cropper</title> <link rel="stylesheet" href="https://code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css"> <style> html, body { background: black; margin: 0; padding: 0; height: 90%; } .image-container { position: relative; min-height: 80%; display: flex; align-items: center; justify-content: center; margin: auto; overflow: visible; /* background-color: #f8f9fa; */ } /* @media (max-width: 480px) { .image-container { min-height: 60vh; } } */ #canvas { display: block; max-width: 100%; max-height: 100%; margin: auto; /* background-color: white; */ } .main-div { padding-top: 5%; width: 100%; height: 100%; background: black; } .overlay { position: absolute; border: 2px solid yellow; cursor: move; touch-action: none; z-index: 1; } .ui-resizable-handle { background-image: none; } .corner { position: absolute; width: 15px; height: 15px; background-color: yellow; border-radius: 50%; } .corner.top-left { top: -5px; left: -5px; } .corner.top-right { top: -5px; right: -5px; } .corner.bottom-left { bottom: -5px; left: -5px; } .corner.bottom-right { bottom: -5px; right: -5px; } .overlay-background { position: absolute; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.5); /* Default opacity for rectangle */ pointer-events: none; } .rotate-buttons { margin-top: 10px; } </style> </head> <body> <div class="main-div"> <button id="cropButton">Crop</button> <select id="shapeSelect" onchange="selectShape()"> <option value="rectangle" selected>Rectangle</option> <option value="circle">Circle</option> </select> <div class="rotate-buttons"> <button onclick="rotateClockwise()">Rotate Clockwise</button> <button onclick="rotateCounterClockwise()">Rotate Counter Clockwise</button> </div> <div class="image-container"> <div class="overlay-background"></div> <canvas id="canvas"></canvas> <div class="overlay"> <div class="corner top-left"></div> <div class="corner top-right"></div> <div class="corner bottom-left"></div> <div class="corner bottom-right"></div> </div> </div> <div id="croppedImagePreview"></div> </div> <script src="https://code.jquery.com/jquery-3.6.0.min.js"></script> <script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui-touch-punch/0.2.3/jquery.ui.touch-punch.min.js"></script>  <script> document.addEventListener('DOMContentLoaded', function() { const canvas = document.getElementById("canvas"); const ctx = canvas.getContext("2d"); const imageObj = new Image(); const overlay = document.querySelector('.overlay'); const overlayBackground = document.querySelector('.overlay-background'); const croppedCanvas = document.createElement("canvas"); const croppedCtx = croppedCanvas.getContext("2d"); let selectedShape = "rectangle"; let rotation = 0; // Initial rotation angle // Define selectShape function to fix the Uncaught ReferenceError window.selectShape = function() { selectedShape = document.getElementById("shapeSelect").value; console.log(selectedShape); // Adjust overlay style based on selected shape overlay.style.borderRadius = selectedShape === "circle" ? "50%" : "0%"; // Adjust border radius for circle // Adjust overlay background opacity based on selected shape if (selectedShape === "circle") { overlayBackground.style.backgroundColor = "rgba(0, 0, 0, 0.5)"; // 50% opacity for circle } else { overlayBackground.style.backgroundColor = "rgba(0, 0, 0, 0.7)"; // Higher opacity for rectangle } }; // Function to rotate the image clockwise window.rotateClockwise = function() { rotation += 90; drawRotatedImage(); }; // Function to rotate the image counter-clockwise window.rotateCounterClockwise = function() { rotation -= 90; drawRotatedImage(); }; function drawRotatedImage() { const originalWidth = imageObj.naturalWidth; const originalHeight = imageObj.naturalHeight; const is90Or270 = Math.abs(rotation % 360) === 90 || Math.abs(rotation % 360) === 270; // Set canvas size based on rotation if (is90Or270) { canvas.width = originalHeight; canvas.height = originalWidth; } else { canvas.width = originalWidth; canvas.height = originalHeight; } ctx.clearRect(0, 0, canvas.width, canvas.height); ctx.save(); ctx.translate(canvas.width / 2, canvas.height / 2); ctx.rotate(rotation * Math.PI / 180); ctx.drawImage(imageObj, -originalWidth / 2, -originalHeight / 2, originalWidth, originalHeight); ctx.restore(); // Update the overlay to match the new dimensions initializeOverlay(); } imageObj.onload = function() { const container = document.querySelector('.image-container'); const ratio = Math.min(container.clientWidth / imageObj.naturalWidth, container.clientHeight / imageObj.naturalHeight); const imageWidth = imageObj.naturalWidth * ratio; const imageHeight = imageObj.naturalHeight * ratio; canvas.width = imageObj.naturalWidth; canvas.height = imageObj.naturalHeight; canvas.style.width = `${imageWidth}px`; canvas.style.height = `${imageHeight}px`; container.style.width = `${imageWidth}px`; container.style.height = `${imageHeight}px`; ctx.drawImage(imageObj, 0, 0, imageObj.naturalWidth, imageObj.naturalHeight); initializeOverlay(); }; imageObj.crossOrigin = "Anonymous"; imageObj.src = 'rope41.png'; // Make sure the path is correct function initializeOverlay() { const container = document.querySelector('.image-container'); const ratio = Math.min(container.clientWidth / imageObj.naturalWidth, container.clientHeight / imageObj.naturalHeight); const imageWidth = imageObj.naturalWidth * ratio; const imageHeight = imageObj.naturalHeight * ratio; var tempImageWidth = imageWidth - 4; //Adjusting width the initial overlay to fit properly in pixels var tempImageHeight = imageHeight - 3; //Adjusting height the initial overlay to fit properly pixels overlay.style.width = `${tempImageWidth}px`; overlay.style.height = `${tempImageHeight}px`; // Center the overlay overlay.style.top = `${(container.clientHeight - imageHeight) / 2}px`; overlay.style.left = `${(container.clientWidth - imageWidth) / 2}px`; $(overlay).resizable({ containment: "parent", handles: 'n, e, s, w, ne, se, sw, nw', minWidth: 100, // Setting minimum width for resizing minHeight: 100, // Setting minimum height for resizing resize: function(event, ui) { updateOverlayBackground(ui.position, ui.size); } }).draggable({ containment: "parent", drag: function(event, ui) { // Get the current dimensions using jQuery const currentWidth = $(overlay).width(); const currentHeight = $(overlay).height(); // Create a size object to pass to the update function const size = { width: currentWidth, height: currentHeight }; updateOverlayBackground(ui.position, size); } }); updateOverlayBackground({ top: overlay.style.top, left: overlay.style.left }, { width: tempImageWidth, height: tempImageHeight }); } function updateOverlayBackground(position, size) { // Corrected to ensure position and size are correctly parsed as numbers const left = parseFloat(position.left) || 0; // Added default value to prevent undefined const top = parseFloat(position.top) || 0; // Added default value to prevent undefined const width = parseFloat(size.width) || 0; // Added default value to prevent undefined const height = parseFloat(size.height) || 0; // Added default value to prevent undefined overlayBackground.style.clipPath = `polygon( 0 0, 0 100%, ${left}px 100%, ${left}px ${top}px, ${left + width}px ${top}px, ${left + width}px ${top + height}px, ${left}px ${top + height}px, ${left}px 100%, 100% 100%, 100% 0 )`; } document.getElementById('cropButton').addEventListener('click', cropImage); function cropImage() { const selectedShape = document.getElementById("shapeSelect").value; const canvasRect = canvas.getBoundingClientRect(); const bounds = overlay.getBoundingClientRect(); const scaleX = canvas.width / canvasRect.width; const scaleY = canvas.height / canvasRect.height; const cropX = (bounds.left - canvasRect.left) * scaleX; const cropY = (bounds.top - canvasRect.top) * scaleY; const cropWidth = bounds.width * scaleX; const cropHeight = bounds.height * scaleY; croppedCanvas.width = cropWidth; croppedCanvas.height = cropHeight; if (selectedShape === "rectangle") { croppedCtx.drawImage(canvas, cropX, cropY, cropWidth, cropHeight, 0, 0, cropWidth, cropHeight); } else if (selectedShape === "circle") { let rx = cropWidth / 2; // Radius along x-axis let ry = cropHeight / 2; // Radius along y-axis let cx = rx; // Center along x-axis let cy = ry; // Center along y-axis croppedCtx.save(); // Save the current context state croppedCtx.beginPath(); croppedCtx.translate(cx, cy); // Translate to the center of the ellipse croppedCtx.scale(1, ry / rx); // Scale to make the circle an ellipse croppedCtx.arc(0, 0, rx, 0, Math.PI * 2); croppedCtx.closePath(); croppedCtx.restore(); // Restore the previous context state croppedCtx.clip(); croppedCtx.drawImage( canvas, cropX, cropY, cropWidth, cropHeight, 0, 0, cropWidth, cropHeight ); } const imgPreview = document.getElementById('croppedImagePreview'); imgPreview.innerHTML = ''; const img = new Image(); img.src = croppedCanvas.toDataURL("image/png"); console.log(img.src); imgPreview.appendChild(img); } }); </script> </body> </html>

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