Add files via upload

CardForge/data/scripts/autocrop.js

@@ -0,0 +1,51 @@
+//Create canvas for cropping the image
+        var cropCanvas = document.createElement("canvas")
+        var cropContext = cropCanvas.getContext("2d")
+        cropCanvas.onload = function() {
+            //document.body.appendChild(cropCanvas) //For testing purposes only
+        }
+        //Function that auto crops the image
+        function autocrop(url, destination) {
+            //Create image, size canvas, draw image
+            var imgTempSetSymbol = new Image()
+            imgTempSetSymbol.src = url
+            imgTempSetSymbol.onload = function() {
+                if (imgTempSetSymbol.width > 0 && imgTempSetSymbol.height > 0) {
+                cropCanvas.width = imgTempSetSymbol.width
+                cropCanvas.height = imgTempSetSymbol.height
+                cropContext.drawImage(imgTempSetSymbol, 0, 0)
+                //declare variables
+                var width = cropCanvas.width
+                var height = cropCanvas.height
+                var pix = {x:[], y:[]}
+                var imageData = cropContext.getImageData(0,0,cropCanvas.width,cropCanvas.height)
+                var x, y, index
+                //Go through every pixel and
+                for (y = 0; y < height; y++) {
+                    for (x = 0; x < width; x++) {
+                        //(y * width + x) * 4 + 3 calculates the index at which the alpha value of the pixel at x, y is given
+                        index = (y * width + x) * 4 + 3
+                        if (imageData.data[index] > 0) {
+                            //pix is the image object that stores two arrays of x and y coordinates. These stored coordinates are all the visible pixels
+                            pix.x.push(x)
+                            pix.y.push(y)
+                        }
+                    }
+                }
+                //sorts the arrays numerically
+                pix.x.sort(function(a,b){return a-b})
+                pix.y.sort(function(a,b){return a-b})
+                var n = pix.x.length - 1
+                //Finds the difference between the leftmost and rightmost visible pixels, and the topmost and bottommost pixels, cuts out a section of the canvas
+                width = pix.x[n] - pix.x[0]
+                height = pix.y[n] - pix.y[0]
+                var cropped = cropContext.getImageData(pix.x[0], pix.y[0], width + 1, height + 1)
+                //Resizes the canvas and draws cropped image
+                cropCanvas.width = width
+                cropCanvas.height = height
+                cropContext.putImageData(cropped, 0, 0)
+                //Saves the newly cropped image to the given image
+                destination.src = cropCanvas.toDataURL()
+            }
+        }
+        }