javascript特效代码大全 js特效教程( 二 )

2022-05-19 生活百科特效

var gfilter = {type: "canvas",name: "filters",author: "zhigang",getInfo: function () {return this.author + ' ' + this.type + ' ' + this.name;},/*** invert color value of pixel, new pixel = RGB(255-r, 255-g, 255 - b)** @param binaryData - canvas's imagedata.data* @param l - length of data (width * height of image data)*/colorInvertProcess: function(binaryData, l) {for (var i = 0; i < l; i += 4) {var r = binaryData[i];var g = binaryData[i + 1];var b = binaryData[i + 2];binaryData[i] = 255-r;binaryData[i + 1] = 255-g;binaryData[i + 2] = 255-b;}},/*** adjust color values and make it more darker and gray...** @param binaryData* @param l*/colorAdjustProcess: function(binaryData, l) {for (var i = 0; i < l; i += 4) {var r = binaryData[i];var g = binaryData[i + 1];var b = binaryData[i + 2];binaryData[i] = (r * 0.272) + (g * 0.534) + (b * 0.131);binaryData[i + 1] = (r * 0.349) + (g * 0.686) + (b * 0.168);binaryData[i + 2] = (r * 0.393) + (g * 0.769) + (b * 0.189);}},/*** deep clone image data of canvas** @param context* @param src* @returns*/copyImageData: function(context, src){var dst = context.createImageData(src.width, src.height);dst.data.set(src.data);return dst;},/*** convolution - keneral size 5*5 - blur effect filter(模糊效果)** @param context* @param canvasData*/blurProcess: function(context, canvasData) {console.log("Canvas Filter - blur process");var tempCanvasData = https://www.520longzhigu.com/diannao/this.copyImageData(context, canvasData);var sumred = 0.0, sumgreen = 0.0, sumblue = 0.0;for ( var x = 0; x < tempCanvasData.width; x++) {for ( var y = 0; y < tempCanvasData.height; y++) {// Index of the pixel in the arrayvar idx = (x + y * tempCanvasData.width) * 4;for(var subCol=-2; subCol<=2; subCol++) {var colOff = subCol + x;if(colOff <0 || colOff >= tempCanvasData.width) {colOff = 0;}for(var subRow=-2; subRow<=2; subRow++) {var rowOff = subRow + y;if(rowOff < 0 || rowOff >= tempCanvasData.height) {rowOff = 0;}var idx2 = (colOff + rowOff * tempCanvasData.width) * 4;var r = tempCanvasData.data[idx2 + 0];var g = tempCanvasData.data[idx2 + 1];var b = tempCanvasData.data[idx2 + 2];sumred += r;sumgreen += g;sumblue += b;}}// calculate new RGB valuevar nr = (sumred / 25.0);var ng = (sumgreen / 25.0);var nb = (sumblue / 25.0);// clear previous for next pixel pointsumred = 0.0;sumgreen = 0.0;sumblue = 0.0;// assign new pixel valuecanvasData.data[idx + 0] = nr; // Red channelcanvasData.data[idx + 1] = ng; // Green channelcanvasData.data[idx + 2] = nb; // Blue channelcanvasData.data[idx + 3] = 255; // Alpha channel}}},/*** after pixel value - before pixel value + 128* 浮雕效果*/reliefProcess: function(context, canvasData) {console.log("Canvas Filter - relief process");var tempCanvasData = https://www.520longzhigu.com/diannao/this.copyImageData(context, canvasData);for ( var x = 1; x < tempCanvasData.width-1; x++){for ( var y = 1; y < tempCanvasData.height-1; y++){// Index of the pixel in the arrayvar idx = (x + y * tempCanvasData.width) * 4;var bidx = ((x-1) + y * tempCanvasData.width) * 4;var aidx = ((x+1) + y * tempCanvasData.width) * 4;// calculate new RGB valuevar nr = tempCanvasData.data[aidx + 0] - tempCanvasData.data[bidx + 0] + 128;var ng = tempCanvasData.data[aidx + 1] - tempCanvasData.data[bidx + 1] + 128;var nb = tempCanvasData.data[aidx + 2] - tempCanvasData.data[bidx + 2] + 128;nr = (nr < 0) ? 0 : ((nr >255) ? 255 : nr);ng = (ng < 0) ? 0 : ((ng >255) ? 255 : ng);nb = (nb < 0) ? 0 : ((nb >255) ? 255 : nb);// assign new pixel valuecanvasData.data[idx + 0] = nr; // Red channelcanvasData.data[idx + 1] = ng; // Green channelcanvasData.data[idx + 2] = nb; // Blue channelcanvasData.data[idx + 3] = 255; // Alpha channel}}},/***before pixel value - after pixel value + 128*雕刻效果** @param canvasData*/diaokeProcess: function(context, canvasData) {console.log("Canvas Filter - process");var tempCanvasData = https://www.520longzhigu.com/diannao/this.copyImageData(context, canvasData);for ( var x = 1; x < tempCanvasData.width-1; x++){for ( var y = 1; y < tempCanvasData.height-1; y++){// Index of the pixel in the arrayvar idx = (x + y * tempCanvasData.width) * 4;var bidx = ((x-1) + y * tempCanvasData.width) * 4;var aidx = ((x+1) + y * tempCanvasData.width) * 4;// calculate new RGB valuevar nr = tempCanvasData.data[bidx + 0] - tempCanvasData.data[aidx + 0] + 128;var ng = tempCanvasData.data[bidx + 1] - tempCanvasData.data[aidx + 1] + 128;var nb = tempCanvasData.data[bidx + 2] - tempCanvasData.data[aidx + 2] + 128;nr = (nr

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