cocos2dx封装一个具有Layout功能的Point类 (提供源码)

(原创文章，转载请注明原文出处：http://blog.csdn.net/while0/article/details/79032004）

基于cocos2dx开发游戏，免不了设置节点或精灵的位置，这些位置坐标常常不是一个绝对坐标值，而是相对于其它节点的相对坐标。例如：精灵A与精灵B左对齐，精灵A与精灵B中心对齐等等。

计算这些相对坐标值，每次都需要进行计算，计算时要考虑到精灵的anchorPoint, scale等，比较繁琐，一不留神就搞错了，调试来调试去浪费时间。本文封装了一个很方便的工具类，帮助你计算这些相对坐标。

直接上源码:

GmbsPoint.h (无cpp文件）

#ifndef __GMBSPOINT_H__
#define __GMBSPOINT_H__#include "cocos2d.h"
#include "GmbsGrid.h"NS_CC_BEGINclass GmbsPoint : public Point
{
public:Node *m_targetNode;GmbsPoint(Node* targetNode = NULL){m_targetNode = targetNode;if (targetNode){Point pt = targetNode->getPosition();x = pt.x;y = pt.y;}}GmbsPoint(Node* targetNode, float xx, float yy){m_targetNode = targetNode;x = xx;y = yy;}GmbsPoint& reset(Node* targetNode, float xx = 0, float yy = 0){m_targetNode = targetNode;x = xx;y = yy;return *this;}public:GmbsPoint& leftAlign(Node* baseNode, float leftPadding = 0){Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.x -= baseNode->getContentSize().width * baseAnchorPoint.x * getScaleX(baseNode);Point point(basePoint.x + leftPadding, basePoint.y);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.x += m_targetNode->getContentSize().width * anchorPoint.x * getScaleX(m_targetNode);point = m_targetNode->getParent()->convertToNodeSpace(point);x = point.x;return *this;}GmbsPoint& leftAlign(GmbsGrid& baseGrid, float leftPadding = 0){return leftAlign(baseGrid.m_ownerNode, leftPadding + baseGrid.origin.x);}GmbsPoint& rightAlign(Node* baseNode, float rightPadding = 0){Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.x += baseNode->getContentSize().width * (1 - baseAnchorPoint.x) * getScaleX(baseNode);Point point(basePoint.x - rightPadding, basePoint.y);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.x -= m_targetNode->getContentSize().width * (1 - anchorPoint.x) * getScaleX(m_targetNode);point = m_targetNode->getParent()->convertToNodeSpace(point);x = point.x;return *this;}GmbsPoint& rightAlign(GmbsGrid& baseGrid, float rightPadding = 0){Node* baseNode = baseGrid.m_ownerNode;Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.x += baseGrid.origin.x + baseGrid.size.width - baseNode->getContentSize().width * baseAnchorPoint.x * getScaleX(baseNode);Point point(basePoint.x - rightPadding, basePoint.y);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.x -= m_targetNode->getContentSize().width * (1 - anchorPoint.x) * getScaleX(m_targetNode);point = m_targetNode->getParent()->convertToNodeSpace(point);x = point.x;return *this;}GmbsPoint& topAlign(Node* baseNode, float topPadding = 0){Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.y += baseNode->getContentSize().height * (1 - baseAnchorPoint.y) * getScaleY(baseNode);Point point(basePoint.x, basePoint.y - topPadding);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.y -= m_targetNode->getContentSize().height * (1 - anchorPoint.y) * getScaleY(m_targetNode);point = m_targetNode->getParent()->convertToNodeSpace(point);y = point.y;return *this;}GmbsPoint& topAlign(GmbsGrid& baseGrid, float topPadding = 0){Node* baseNode = baseGrid.m_ownerNode;Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.y += baseGrid.origin.y + baseGrid.size.height - baseNode->getContentSize().height * baseAnchorPoint.y * getScaleY(baseNode);Point point(basePoint.x, basePoint.y - topPadding);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.y -= m_targetNode->getContentSize().height * (1 - anchorPoint.y) * getScaleY(m_targetNode);point = m_targetNode->getParent()->convertToNodeSpace(point);y = point.y;return *this;}GmbsPoint& bottomAlign(Node* baseNode, float bottomPadding = 0){Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.y -= baseNode->getContentSize().height * baseAnchorPoint.y * getScaleY(baseNode);Point point(basePoint.x, basePoint.y + bottomPadding);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.y += m_targetNode->getContentSize().height * anchorPoint.y * getScaleY(m_targetNode);point = m_targetNode->getParent()->convertToNodeSpace(point);y = point.y;return *this;}GmbsPoint& bottomAlign(GmbsGrid& baseGrid, float bottomPadding = 0){return bottomAlign(baseGrid.m_ownerNode, bottomPadding + baseGrid.origin.y);}GmbsPoint& xMiddleAlign(Node* baseNode, float padding = 0){Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.x += baseNode->getContentSize().width * (0.5 - baseAnchorPoint.x) * getScaleX(baseNode);Point point(basePoint.x + padding, basePoint.y);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.x -= m_targetNode->getContentSize().width * (0.5 - anchorPoint.x) * getScaleX(m_targetNode);point = m_targetNode->getParent()->convertToNodeSpace(point);x = point.x;return *this;}GmbsPoint& xMiddleAlign(GmbsGrid& baseGrid, float padding = 0){Node* baseNode = baseGrid.m_ownerNode;Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.x += baseGrid.origin.x + baseGrid.size.width/2 - baseNode->getContentSize().width * baseAnchorPoint.x * getScaleX(baseNode);Point point(basePoint.x + padding, basePoint.y);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.x -= m_targetNode->getContentSize().width * (0.5 - anchorPoint.x) * getScaleX(m_targetNode);point = m_targetNode->getParent()->convertToNodeSpace(point);x = point.x;return *this;}GmbsPoint& yMiddleAlign(Node* baseNode, float padding = 0){Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.y += baseNode->getContentSize().height * (0.5 - baseAnchorPoint.y) * getScaleY(baseNode);Point point(basePoint.x, basePoint.y + padding);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.y -= m_targetNode->getContentSize().height * (0.5 - anchorPoint.y) * getScaleY(m_targetNode);point = m_targetNode->getParent()->convertToNodeSpace(point);y = point.y;return *this;}GmbsPoint& yMiddleAlign(GmbsGrid& baseGrid, float padding = 0){Node* baseNode = baseGrid.m_ownerNode;Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.y += baseGrid.origin.y + baseGrid.size.height/2 - baseNode->getContentSize().height * baseAnchorPoint.y * getScaleY(baseNode);Point point(basePoint.x, basePoint.y + padding);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.y -= m_targetNode->getContentSize().height * (0.5 - anchorPoint.y) * getScaleY(m_targetNode);point = m_targetNode->getParent()->convertToNodeSpace(point);y = point.y;return *this;}GmbsPoint& rightTo(Node* baseNode, float rightPadding = 0){Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.x -= baseNode->getContentSize().width * baseAnchorPoint.x * getScaleX(baseNode);Point point(basePoint.x - rightPadding, basePoint.y);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.x -= m_targetNode->getContentSize().width * (1 - anchorPoint.x) * getScaleX(m_targetNode);;point = m_targetNode->getParent()->convertToNodeSpace(point);x = point.x;return *this;}GmbsPoint& leftTo(Node* baseNode, float leftPadding = 0){Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.x += baseNode->getContentSize().width * (1 - baseAnchorPoint.x) * getScaleX(baseNode);Point point(basePoint.x + leftPadding, basePoint.y);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.x += m_targetNode->getContentSize().width * anchorPoint.x * getScaleX(m_targetNode);;point = m_targetNode->getParent()->convertToNodeSpace(point);x = point.x;return *this;}GmbsPoint& bottomTo(Node* baseNode, float bottomPadding = 0){Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.y += baseNode->getContentSize().height * (1 - baseAnchorPoint.y) * getScaleY(baseNode);Point point(basePoint.x, basePoint.y + bottomPadding);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.y += m_targetNode->getContentSize().height * anchorPoint.y * getScaleY(m_targetNode);;point = m_targetNode->getParent()->convertToNodeSpace(point);y = point.y;return *this;}GmbsPoint& topTo(Node* baseNode, float topPadding = 0){Point baseAnchorPoint(0, 0);Point basePoint = baseNode->getPosition();Node* baseParent = baseNode->getParent();if (baseParent != NULL)basePoint = baseParent->convertToWorldSpace(basePoint);if (!baseNode->isIgnoreAnchorPointForPosition())baseAnchorPoint = baseNode->getAnchorPoint();basePoint.y -= baseNode->getContentSize().height * baseAnchorPoint.y * getScaleY(baseNode);;Point point(basePoint.x, basePoint.y - topPadding);Point anchorPoint(0, 0);if (!m_targetNode->isIgnoreAnchorPointForPosition())anchorPoint = m_targetNode->getAnchorPoint();point.y -= m_targetNode->getContentSize().height * (1 - anchorPoint.y) * getScaleY(m_targetNode);;;point = m_targetNode->getParent()->convertToNodeSpace(point);y = point.y;return *this;}static float getScaleX(Node* node){float scale = node->getScaleX();Node* parent = node->getParent();while (parent != NULL){scale *= parent->getScaleX();parent = parent->getParent();}return scale;}static float getScaleY(Node* node){float scale = node->getScaleY();Node* parent = node->getParent();while (parent != NULL){scale *= parent->getScaleY();parent = parent->getParent();}return scale;}
};NS_CC_END#endif

GmbsGrid.h (无cpp文件）

#ifndef __GMBSGRID_H__
#define __GMBSGRID_H__#include "cocos2d.h"NS_CC_BEGINclass GmbsGrid : public Rect
{
protected:int m_xNum;int m_yNum;GmbsGrid** m_children;public:Node *m_ownerNode;GmbsGrid(Node* ownerNode, int xNum, int yNum){m_ownerNode = ownerNode;origin = Point(0, 0);size = ownerNode->getContentSize();m_xNum = xNum;m_yNum = yNum;m_children = (GmbsGrid**)malloc(xNum*yNum*sizeof(GmbsGrid*));memset(m_children, 0, xNum*yNum*sizeof(GmbsGrid*));}GmbsGrid(Node* ownerNode, Rect& rect, int xNum, int yNum){m_ownerNode = ownerNode;origin = rect.origin;size = rect.size;m_xNum = xNum;m_yNum = yNum;m_children = (GmbsGrid**)malloc(xNum*yNum*sizeof(GmbsGrid*));memset(m_children, 0, xNum*yNum*sizeof(GmbsGrid*));}GmbsGrid(Rect& rect, int xNum, int yNum){m_ownerNode = NULL;origin = rect.origin;size = rect.size;m_xNum = xNum;m_yNum = yNum;m_children = (GmbsGrid**)malloc(xNum*yNum*sizeof(GmbsGrid*));memset(m_children, 0, xNum*yNum*sizeof(GmbsGrid*));}virtual ~GmbsGrid(){release();}void release(){for (int j = 0; j < m_yNum; j++){for (int i = 0; i < m_xNum; i++){if (m_children[j*m_xNum + i] != NULL){delete m_children[j*m_xNum + i];m_children[j*m_xNum + i] = NULL;}}}}GmbsGrid& child(int x, int y){if (m_children[y*m_xNum + x] == NULL){Rect rect;rect.size.setSize(size.width/m_xNum, size.height/m_yNum);rect.origin.setPoint(origin.x + rect.size.width*x, origin.y + rect.size.height*y);m_children[y*m_xNum + x] = new GmbsGrid(m_ownerNode, rect, 1, 1);}return *m_children[y*m_xNum + x];}//counting from up to downGmbsGrid& childUtd(int x, int y){int yNew = m_yNum - 1 - y;if (m_children[yNew*m_xNum + x] == NULL){Rect rect;rect.size.setSize(size.width/m_xNum, size.height/m_yNum);rect.origin.setPoint(origin.x + rect.size.width*x, origin.y + rect.size.height*yNew);m_children[yNew*m_xNum + x] = new GmbsGrid(m_ownerNode, rect, 1, 1);}return *m_children[yNew*m_xNum + x];}void setOwnerNode(Node* ownerNode){m_ownerNode = ownerNode;}
};NS_CC_END#endif

举例：

1) spriteA与spriteB中心对齐：

GmbsPoint pt(spriteA);
pt.xMiddleAlign(spriteB).yMiddleAlign(spriteB);
spriteA->setPosition(pt);

2) spriteA与spriteB左对齐且底对齐：

GmbsPoint pt(spriteA);
pt.leftAlign(spriteB).bottomAlign(spriteB);
spriteA->setPosition(pt);

3) spriteA在spriteB左侧，且相距间隔为10，它们底部对齐：

GmbsPoint pt(spriteA);
pt.leftTo(spriteB, 10).bottomAlign(spriteB);
spriteA->setPosition(pt);

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cocos2dx封装一个具有Layout功能的Point类 (提供源码)

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