Cocos2d-x3.0 RenderTexture(一) 保存

.h

#include "cocos2d.h"#include "cocos-ext.h"#include "ui/CocosGUI.h"#include "cocostudio/CocoStudio.h"USING_NS_CC;USING_NS_CC_EXT;using namespace ui;

    RenderTexture* _target;    Vector<Sprite*> _brushs;        void onTouchesMoved(const std::vector<Touch*>& touches, Event* event);        void saveImage(cocos2d::Ref *sender);    void clearImage(cocos2d::Ref *sender);

.cpp

        Size widgetSize = Director::getInstance()->getWinSize();                                        layout = Layout::create();        layout->setSize(Size(widgetSize.width, widgetSize.height));               //横向排列，这里类似Android里的线性布局        //layout->setLayoutType(LAYOUT_RELATIVE);        /*以图片为背景*/        layout->setBackGroundImageScale9Enabled(true);        layout->setBackGroundImage("green_edit.png");                layout->setPosition(Point(0,0));        addChild(layout);                         alert = Text::create("Layout", "fonts/Marker Felt.ttf", 30 );        alert->setColor(Color3B(159, 168, 176));        alert->setPosition(Point(widgetSize.width / 2.0f,                                 widgetSize.height / 2.0f - alert->getSize().height * 3.075f));                layout->addChild(alert);                        _target = RenderTexture::create(widgetSize.width, widgetSize.height, Texture2D::PixelFormat::RGBA8888);        _target->retain();        _target->setPosition(Point(widgetSize.width / 2, widgetSize.height / 2));        layout->addChild(_target);                        auto listener = EventListenerTouchAllAtOnce::create();        listener->onTouchesMoved = CC_CALLBACK_2(LayoutTest::onTouchesMoved, this);        _eventDispatcher->addEventListenerWithSceneGraphPriority(listener, this);                //save Image menu        MenuItemFont::setFontSize(40);        auto item1 = MenuItemFont::create("save Image", CC_CALLBACK_1(LayoutTest::saveImage, this));        auto item2 = MenuItemFont::create("Clear", CC_CALLBACK_1(LayoutTest::clearImage, this));        auto menu = Menu::create(item1,item2, NULL);        layout->addChild(menu);        menu->alignItemsVertically();        menu->setPosition(Point(VisibleRect::rightTop().x - 80, VisibleRect::rightTop().y - 80));        

void LayoutTest::onTouchesMoved(const std::vector<Touch *> &touches, cocos2d::Event *event){        auto touch = touches[0];    auto start = touch->getLocation();    auto end = touch->getPreviousLocation();        //begin drawing to the render texture    _target->begin();        //for extra points ,we'll draw this smoothly from the last position and vary the sprite's    //scale/rotation/offset    float distance = start.getDistance(end);    if (distance > 1) {        int d = (int)distance;        _brushs.clear();        for (int i = 0; i < d; ++i) {            Sprite* sprite = Sprite::create("image.png");            sprite->setColor(Color3B::RED);                        sprite->setOpacity(20);            _brushs.pushBack(sprite);        }        for (int i  = 0 ; i  < d; ++i) {            float difx = end.x - start.x;            float dify = end.y - start.y;            float delta = (float) i / distance;            _brushs.at(i)->setPosition(Point(start.x + (difx * delta), start.y + (dify * delta)));            _brushs.at(i)->setRotation(rand() % 360);            float r = (float) (rand() % 50 / 50.0f) + 0.25f;            _brushs.at(i)->setScale(r);            _brushs.at(i)->setColor(Color3B(rand() % 127 + 128, 255, 255));            _brushs.at(i)->visit();        }    }    _target->end();}void LayoutTest::saveImage(cocos2d::Ref *sender){    static int counter = 0;    char png[20];    sprintf(png, "image-%d.png",counter);    char jpg[20];    sprintf(jpg, "image-%d.jpg",counter);            _target->saveToFile(png, Image::Format::PNG);    _target->saveToFile(jpg, Image::Format::JPG);        //向本地写入    std::string fileName = FileUtils::getInstance()->getWritablePath() + jpg;    auto action1 = DelayTime::create(1);    auto func = [&,fileName]()    {        auto sprite = Sprite::create(fileName);        layout->addChild(sprite);        sprite->setScale(0.3f);        sprite->setPosition(Point(40, 40));        sprite->setRotation(counter * 3);            };        runAction(Sequence::create(action1,CallFunc::create(func), NULL));    counter++;}void LayoutTest::clearImage(cocos2d::Ref *sender){    _target->clear(CCRANDOM_0_1(), CCRANDOM_0_1(), CCRANDOM_0_1(), CCRANDOM_0_1());    }