【web】 长按保存图片

如题 是否有demo？

img标签和node的尺寸是否有一个正确比例？

已解决…

大佬
能发个demo嘛

大佬 发个demo学习学习

后边会发的

  /**
   * web识别/保存图片
   */
  static webNodeToImg(nodeCapture: cc.Node, parent: cc.Node, imgH: string = "") {
    let nodeCamera = new cc.Node();
    nodeCamera.parent = parent;
    let camera = nodeCamera.addComponent(cc.Camera);

    let position = nodeCapture.getPosition();
    let width = nodeCapture.width;
    let height = nodeCapture.height;

    camera.alignWithScreen = false;
    camera.ortho = true;
    camera.orthoSize = height / 2;

    let texture = new cc.RenderTexture();
    texture.initWithSize(width, height);

    camera.targetTexture = texture;

    // 创建画布
    let canvas = document.createElement('canvas');
    canvas.width = width;
    canvas.height = height;

    let ctx = canvas.getContext('2d');

    nodeCapture.setPosition(cc.Vec2.ZERO);
    camera.render(nodeCapture);
    nodeCapture.setPosition(position);

    let data = texture.readPixels();
    let rowBytes = width * 4;
    for (let row = 0; row < height; row++) {
      let srow = height - 1 - row;
      let imageData = ctx.createImageData(width, 1);
      let start = srow * width * 4;
      for (let i = 0; i < rowBytes; i++) {
        imageData.data[i] = data[start + i];
      }
      ctx.putImageData(imageData, 0, row);
    }

    let dataURL = canvas.toDataURL("image/png");

    let img = document.createElement("img");
    img.src = dataURL; //截图数据
    img.id = "capture";
    img.alt = "capture";

    img.style.position = "absolute";
    img.style.opacity = "0"

    img.style.left = img.style.top = img.style.right = img.style.bottom = "0";
    img.style.width = "100%"
    img.style.height = imgH + "%"
    if (imgH == "100") {
      img.style.margin = "auto";
    }


    let divGame = document.getElementById("Cocos2dGameContainer");
    divGame.appendChild(img);

    nodeCamera.destroy();
  }

mark!

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