cocos2d screenshot function

Screenshot function

    var size = cc.director.getWinSize();

    var width = size.width;

    var height = size.height;

//Add screenshot function

    var renderTexture =new cc.RenderTexture(parseInt(width) , parseInt(height) , cc.Texture2D.PIXEL_FORMAT_RGBA8888);

    renderTexture.setPosition(size.width / 2, size.height / 2);

    renderTexture . begin () ;            // start screen capture

    this . mCurrenTopicLayout . visit () ; // Traverse all the child node information of the current scene Scene and draw it into the screen

    renderTexture . end () ;              //end screen capture

    var imageUrl = "topic_" + mTopicLayerSelf.mTopicPos + ".png";

//Save the image to the running device

    var result = renderTexture.saveToFile(imageUrl);

//将截图的缓存清理掉。否则会造成 下次截图的时候 会将上次的截图一并截取出来

    renderTexture.cleanup();

//拿到图片缓存的路径

    var imgPath = jsb.fileUtils.getWritablePath();

    if (imgPath.length == 0) {

        return;

    }

    if (result) {

        imgPath += imageUrl;

     }

//删除本地的图片

jsb.fileUtils.removeFile(imgPath,function () {

    cc.log("删除图片");

});

删除本地截图以后。要将本地纹理缓存同时清空。cocos2d会自动将精灵图片存入纹理缓存中。以便下次使用

cc.spriteFrameCache.removeSpriteFrames();

cc.textureCache.removeAllTextures();

cocos2d-x 功能类似