//用平臺封裝的函數進行碰撞檢測
//將磚塊精靈放入一個數組（容器）之中然後一 一進行碰撞檢測
bool MyMap::isCollideWithHeroX()
{
for(auto x:Road)
{
if(x->boundingBox().intersectsRect(myHero->getSprite()->boundingBox())) //boundingBox().intersectsRect(）這個函數獲取的是精靈的標準矩形，如果要更精確的檢測可以自己獲取一個不規則多邊形進行檢測
{
return true;
}
}
return false;
}
//網上學習
檢測矩形與矩形碰撞的函數：
bool intersectsRect(const CCRect &rect) 使用方法： rect1.intersectsRect(rect2);
檢測點與矩形碰撞的函數： bool containsPoint(const CCPoint &point) 使用方法： rect.containsPoint(point);
下面重點說矩形與圓形的碰撞檢測： PS：先說一下cocos2d-x中的矩形Rect，Rect的構造有四個參數，x, y, width, height,如下圖所示
//
// CGCircle.h
// HelloCpp
//
// Created by Mike on 14-1-16.
//
//
#ifndef __HelloCpp__CGCircle__
#define __HelloCpp__CGCircle__
#include <iostream>
#include "cocos2d.h"
using namespace std;
using namespace cocos2d;
class CGCircle
{
private:
//float _radius; //半徑
//Point _position; //圓心
public:
CC_SYNTHESIZE(float, _radius, Radius);
CC_SYNTHESIZE(Point, _position, Position);
CGCircle(float radius, Point position): _radius(radius), _position(position){};
bool isContainRect(Rect rect);
};
#endif /* defined(__HelloCpp__CGCircle__) */</iostream>
// CGCircle.cpp
// HelloCpp
//
// Created by Mike on 14-1-16.
//
//
#include "CGCircle.h"
bool CGCircle::isContainRect(Rect rect)
{
bool _isContian = false;
Point orign = _position; //圓心，新建座標系的原點
//圓的外切正方形 Rect(x, y, width, heigth) x,y是原點，左下頂點
Rect square = Rect::Rect(_position.x - _radius, _position.y - _radius,
2 * _radius, 2 * _radius);
do {
Point rectVertex0 = rect.origin; //左下
Point rectVertex1 = rect.origin + Point(rect.size.width, 0); //右下
Point rectVertex2 = rect.origin + Point(rect.size.width, rect.size.height); //右上
Point rectVertex3 = rect.origin + Point(0, rect.size.height); //左上
Point pos[] = {rectVertex0, rectVertex1, rectVertex2, rectVertex3};
if ((pos[1].x - orign.x) * (pos[3].x - orign.x) > 0 &&
(pos[1].y - orign.y) * (pos[3].y - orign.y) > 0)
{
//右下頂點和左上頂點在同一象限，說明整個矩形位於一個象限內 若各頂點至少有一個在圓內則相交
for (int i = 0; i < 4; i++) {
//判斷矩形四個頂點是否至少有一個位於圓內
if (((pos[i].x - orign.x) * (pos[i].x - orign.x)
+ (pos[i].y - orign.y) * (pos[i].y - orign.y))
<= _radius * _radius)
{
goto next;
}
}
}
if (square.intersectsRect(rect)) {
goto next;
}
for (int i = 0; i < 4; i++) {
if (pos[i] == orign) {
goto next;
}
}
break;
next:
_isContian = true;
} while (0);
return _isContian;
}
Size visibleSize = Director::getInstance()->getVisibleSize();
auto circleS = Sprite::create("circle.png");
circleS->setPosition(Point(visibleSize.width/2, visibleSize.height/2));
this->addChild(circleS, 0);
auto rectS = Sprite::create("rect.png");
rectS->setPosition(Point(circleS->getPositionX() - 100, circleS->getPositionY()));
this->addChild(rectS, 0);
CGCircle circle0 = CGCircle(circleS->getContentSize().width/2, circleS->getPosition());
Rect rect0 = Rect(rectS->getPositionX() - rectS->getContentSize().width/2,
rectS->getPositionY() - rectS->getContentSize().height/2,
rectS->getContentSize().width, rectS->getContentSize().height);
if (circle0.isContainRect(rect0)) {
CCLOG("circleS與rectS碰撞了");
}
else CCLOG("circleS與rectS未碰撞");
float radius = 30.0;
Point position = Point(300, 300);
CGCircle circle = CGCircle(radius, position);
Rect rect1 = Rect(280, 290, 10, 30);
if (circle.isContainRect(rect1))
{
CCLOG("矩形1與圓碰撞了");
}
Rect rect2 = Rect(210, 290, 10, 30);
if (! circle.isContainRect(rect2))
{
CCLOG("矩形2與圓未碰撞");
}
