cocos2d创建不规则按钮

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_22990635/article/details/75212240

在游戏中，有时候会遇到不规则的按钮，比如：三国类的地图上的按钮，根据国家的的大小，划分成不同大小的不规则按钮，我们知道，素材都是规则的矩形，只不过有些圆形，不规则等图形中，在Image中处理时的数据为0而已。具体的像素问题不是很了解，好了，直接上代码。

IrregularButton.h

#ifndef __IRREGULAR_BUTTON_H__
#define __IRREGULAR_BUTTON_H__ 

#include "cocos2d.h"
#include "ui/CocosGUI.h"
USING_NS_CC;
using namespace ui;

class IrregularButton : public Button
{
public:
	IrregularButton();                                     
	virtual ~IrregularButton();                            
	static IrregularButton* create(const std::string& normalImage,const std::string& selectedImage = "",const std::string& disableImage = "",Widget::TextureResType texType = Widget::TextureResType::LOCAL);
	virtual bool init(const std::string& normalImage, const std::string& selectedImage = "", const std::string& disableImage = "", Widget::TextureResType texType = Widget::TextureResType::LOCAL) override;
	virtual bool hitTest(const cocos2d::Vec2 &pt) override;
	
	void loadNormalTransparentInfo(std::string normalImage);   //初始化按钮
	bool getIsTransparentAtPoint(cocos2d::Vec2 point);		   //获取点击到的像素数据

private:
	int normalImageWidth_;
	int normalImageHeight_;
	bool* normalTransparent_;

};


#endif

IrregularButton.cpp

#include "IrregularButton.h"
IrregularButton::IrregularButton() :
Button(),
normalTransparent_(nullptr)
{}

IrregularButton::~IrregularButton()
{
	delete[] normalTransparent_;
}

IrregularButton* IrregularButton::create(const std::string& normalImage, const std::string& selectedImage, const std::string& disableImage, TextureResType texType)
{
	IrregularButton* btn = new IrregularButton();
	if (btn && btn->init(normalImage, selectedImage, disableImage, texType)) {
		btn->autorelease();
		return btn;
	}
	CC_SAFE_DELETE(btn);
	return nullptr;
}

bool IrregularButton::init(const std::string &normalImage, const std::string& selectedImage, const std::string& disableImage, TextureResType texType)
{
	bool ret = true;
	do {
		if (!Button::init(normalImage, selectedImage, disableImage, texType)) {
			ret = false;
			break;
		}
	} while (0);
	loadNormalTransparentInfo(normalImage);
	return ret;
}


void IrregularButton::loadNormalTransparentInfo(std::string sName)
{
	Image* normalImage = new Image();
	normalImage->initWithImageFile(sName);
	normalImageWidth_ = normalImage->getWidth();
	normalImageHeight_ = normalImage->getHeight();
	this->setContentSize(Size(normalImageWidth_, normalImageHeight_));
	auto dataLen = normalImage->getDataLen();
	if (normalTransparent_ != nullptr) {
		delete[] normalTransparent_;
	}
	auto normalPixels = normalImage->getData();
	normalTransparent_ = new bool[dataLen / (sizeof(unsigned char)* 4)];
	for (auto i = 0; i < normalImageHeight_; i++) {
		for (auto j = 0; j < normalImageWidth_; j++) {
			normalTransparent_[i * normalImageWidth_ + j] = (normalPixels[(i * normalImageWidth_ + j) * 4] == 0);
		}
	}

	delete normalImage;
}

bool IrregularButton::getIsTransparentAtPoint(cocos2d::Vec2 point)
{
	point.y = _buttonNormalRenderer->getContentSize().height - point.y;
	int x = (int)point.x - 1;
	if (x < 0) {
		x = 0;
	}
	else if (x >= normalImageWidth_) {
		x = normalImageWidth_ - 1;
	}
	int y = (int)point.y - 1;
	if (y < 0) {
		y = 0;
	}
	else if (y >= normalImageHeight_) {
		y = normalImageHeight_ - 1;
	}
	return normalTransparent_[normalImageWidth_ * y + x];
}

bool IrregularButton::hitTest(const Vec2 &pt)
{
	Vec2 localLocation = _buttonNormalRenderer->convertToNodeSpace(pt);
	Rect validTouchedRect;
	validTouchedRect.size = _buttonNormalRenderer->getContentSize();
	if (validTouchedRect.containsPoint(localLocation) && getIsTransparentAtPoint(localLocation) == false)
	{
		log("IN");
		//NotificationCenter::getInstance()->postNotification("NotifyIrregularBtn", (Ref*)m_iBtnID);
		return true;
	}
	return false;
}

然后在HelloWorld中直接创建就可以了

	const std::string sNameN = "smile.png";
	const std::string sNameP = "angry.png";
	IrregularButton* alphaBtn = IrregularButton::create(sNameN, sNameP, sNameP);
	alphaBtn->setPosition(ccp(400, 400));
	this->addChild(alphaBtn);
	alphaBtn->addTouchEventListener(CC_CALLBACK_2(HelloWorld::IrregularButtonCallBack, this));

void HelloWorld::IrregularButtonCallBack(Ref* pSender, Widget::TouchEventType touchtype)
{
	switch (touchtype)
	{
	case Widget::TouchEventType::BEGAN:
		log("IrregularButtonCallBack--------TouchBegan");
		break;
	case Widget::TouchEventType::MOVED:
		log("IrregularButtonCallBack--------TouchMoved");
		break;
	case Widget::TouchEventType::ENDED:
		log("IrregularButtonCallBack--------TouchEnded");
		break;
	}
}

这样我们就能够跟普通的按钮一样使用了，源码下载地址：

https://pan.baidu.com/s/1dEYi6tF