canvas.height=height;varctx=canvas.getContext('2d'); ctx.drawImage(img,0,0);//获取坐标颜色functiongetPixelColor (x, y) {varimageData=ctx.getImageData(x, y,1,1);varpixel=imageData.data;varr=pixel[0];varg=pixel[1];varb=pixel[2];vara=pixel[3]/255; a=Math.round(a*100)/100;var...
let data = context.getImageData(0, 0, 1, 1).data;console.log(data);// Expected result: [ 0, 0, 0, 255 ]// Fingerprinting protection can cause something like: [ 0, 2, 1, 255 ] It's Not Color SpaceIf you search for why this is happening, you'll probably run across a lot ...
var ctx = canvas.getContext('2d'); ctx.drawImage(img, 0, 0); // 获取坐标颜色 function getPixelColor (x, y) { var imageData = ctx.getImageData(x, y, 1, 1); console.log(imageData, 222222222) var pixel = imageData.data; var r = pixel[0]; var g = pixel[1]; var b = pi...
int CanvasGetPixel (int panelHandle, int controlID, Point point, int *pixelColor); Purpose Obtains the color of a single pixel on a canvas control. Note The canvas control maintains an internal bitmap reflecting all of the drawing operations (except for drawing operations made while the ATTR...
具体来说,如果使用Canvas API中的2D API,则可以使用getPixel()方法获取指定坐标的像素颜色值。例如: 代码语言:javascript 复制 // 获取画布并获取像素颜色值constcanvas=document.getElementById('myCanvas');constctx=canvas.getContext('2d');constpixelIndex=25;constpixelColor=ctx.getPixel(canvas.width,pixelInd...
font.draw_text(canvas, xpos +500, ypos, info, clan::Colorf::black); } 开发者ID:doughdemon,项目名称:ClanLib,代码行数:62,代码来源:alpha.cpp 注:本文中的clan::Canvas::get_pixeldata方法示例由纯净天空整理自Github/MSDocs等开源代码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源...
Color=document.getElementById('canvas3');functionpick(event,destination){varx=event.layerX;//鼠标的x,y数值;vary=event.layerY;console.log('mouse position of x,y is ',x,y);varpixel=ctx.getImageData(x,y,1,1);vardata=pixel.data;//console.log('pixel is =',pixel);//var data=pixel....
Now to retrieve the color from a pixel, we are going to use the getImageData method from the context of the canvas and we are going to limit it to 1 pixel (x1,y1) according to the location of a click (or any mouse event that you want) event. ...
var ctx = canvas.getContext('2d'); ctx.drawImage(img, 0, 0, width, height); //这里一定要写上获取到图片的宽高,否则生成的图片和原图片大小不一样,吸取到的颜色不准 // 获取坐标颜色 function getPixelColor(x, y) { var imageData = ctx.getImageData(x, y, 1, 1); ...
After it is rendered onto a canvas, I need to iterate through all the x and y coordinates of the canvas and get the color of the pixel at that x,y coordinate. How do I do this? I can't find a getRGB(x,y) that works on a canvas. Thanks Not open for further replies. Similar...