Cocos2d-x3.0 RenderTexture(一) 保存

#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，这里相似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());

}

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Cocos2d-x3.0 RenderTexture(一) 保存

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