如何在cocos2d-x中使用CCRenderTexture实现Undo Redo绘制平滑线功能

Question

我做了一个使用CCSprite和CCRenderTexture绘图的功能。喜欢

    Paint *paintColor=Paint::create("texture1@2x.png");
    draw=true;

    CCPoint end = touch->getPreviousLocationInView();
    end = CCDirector::sharedDirector()->convertToGL(end);

    target->begin();

    float distance = ccpDistance(start, end);

    for (int i = 0; i < distance; i++)
    {
        paintColor->color=globalColor;
        paintColor->setColor(paintColor->color);
        paintColor->scale=globalScale;
        paintColor->setScale(paintColor->scale);
        paintColor->opacity=globalOpacity;
        paintColor->setOpacity(paintColor->opacity);


        float difx = end.x - start.x;
        float dify = end.y - start.y;
        float delta = (float)i / distance;

        CCPoint p=ccp(start.x + (difx * delta), start.y + (dify * delta));

        paintColor->originalPosition=p;
        paintColor->setPosition(paintColor->originalPosition);

        tempPath.path.push_back(p);
        tempPath.color=globalColor;
        tempPath.scale=globalScale;
        tempPath.opacity=globalOpacity;


        paintColor->visit();
}

但我想要撤消功能，并想从CCRenderTexture中删除最后绘制纹理。任何人都可以帮助我实现这一功能。有什么方法可以从CCRenderTexture中删除精灵吗？

Answer 1

在我的例子中，我确实喜欢关注。每当绘制完成(touchbegan，touchmove，touchend)时，我将RenderTexture图像保存在一个数组中。然后，当我单击undo按钮时，我从数组中提取图像并在RenderTexture上访问它。我希望它能对你有所帮助。