我想使用caman js和fabric js对同一画布中的图像产生影响.我怎样才能把它们结合起来? [英] i want to use caman js and fabric js to give effect on an image in same canvas. how can i combine them?

问题描述

我想同时使用caman js和fabric js来实现图像效果.我试图合并代码，但它给出了两个图像而不是一个图像.我该如何结合caman js和fabric js并解决此问题? 我参考: http://camanjs.com/和

I want to give effect to image using both caman js and fabric js. I tried to combine the code but it gives two images instead of one. What can i do to combine caman js and fabric js and fix this? I reffered to: http://camanjs.com/ and http://fabricjs.com/articles/ Thank you.

推荐答案

我认为没有直接的方法可以将面料和caman结合起来.这是我使用的一种变通方法(只是一个简单的方法.您可以根据自己的意愿进行增强):

I don't think there is a direct way to combine fabric and caman. Here is a workaround that i have used (Just a simple one. You can enhance it as per your wish) :

HTML

<canvas id="canvas" width="600" height="300"></canvas>

JavaScript

Javascript

var canvas = new fabric.Canvas('canvas');

fabric.Image.fromURL('image.png', function(img) {
  img.set({
    left: 10,
    top: 50
  });

  canvas.add(img).setActiveObject(img);
  canvas.renderAll();

  var hiddenImg = document.createElement('img');
  hiddenImg.src = canvas.getActiveObject().toDataURL();
  hiddenImg.id = 'target';
  hiddenImg.style.display = 'none';
  document.body.appendChild(hiddenImg);

  Caman('#target', function(value) {
    this.brightness(10);
    this.contrast(20);

    this.render(function() {
      canvas.getActiveObject().setSrc(document.getElementById('target').toDataURL(), function() {
        canvas.renderAll();
      });
    });
  });
});

这是小提琴: http://jsfiddle.net/k7moorthi/dfp1b0mq/

注意:如果要使用外部图像来避免浏览器对toDataURL()方法的安全性阻塞，请将crossOrigin选项设置为fabric.Image.fromURL()方法.例如:

NOTE: Set crossOrigin option to fabric.Image.fromURL() method if you want to use external images to avoid browser security blocking for toDataURL() method. Eg:

fabric.Image.fromURL('https://s3-eu-west-1.amazonaws.com/kienzle.dev.cors/img/image2.png', function(img) {
  ...
}, { crossOrigin: 'anonymous' });

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