diamondmap.java

mywork是rcp开发的很好的例子

package net.sf.pim.game.util;

import org.eclipse.swt.graphics.Point;

/**
 * 对diamond map的核心处理,包括TilePlotter/TileWalker/MouseMap
 * @author Administrator
 *
 */
public class DiamondMap {
	//定义方向
	public enum IsoDirection{NORTH,NORTH_EAST,EAST,NORTH_WEST,CENTER,SOUTH_EAST,WEST,SOUTH_WEST,SOUTH}
	/**
	 * 将地图坐标转化为世界(屏幕)坐标
	 * @param ptMap
	 * @param tileWidth
	 * @param tileHeight
	 * @param offsetX
	 * @param offsetY
	 * @return 
	 */
	public static Point tilePlotter(Point ptMap,int tileWidth,int tileHeight,int offsetX,int offsetY){
		Point worldPoint=new Point(0,0);
		worldPoint.x=(ptMap.x-ptMap.y)*tileWidth/2 + offsetX;
		worldPoint.y=(ptMap.x+ptMap.y)*tileHeight/2 + offsetY;
		return worldPoint;
	}
	/**
	 * 处理地图的移动
	 * @param ptStart
	 * @param direction
	 * @return
	 */
	public static Point tileWalker(Point ptStart,IsoDirection direction){
		switch(direction){
		case NORTH:
			ptStart.x --;
			ptStart.y --;
			break;
		case NORTH_EAST:
			ptStart.y --;
			break;
		case EAST:
			ptStart.x ++;
			ptStart.y --;
			break;
		case SOUTH_EAST:
			ptStart.x ++;
			break;
		case SOUTH:
			ptStart.x ++;
			ptStart.y ++;
			break;
		case SOUTH_WEST:
			ptStart.y ++;
			break;
		case WEST:
			ptStart.x --;
			ptStart.y ++;
			break;
		case NORTH_WEST:
			ptStart.x --;
			break;
		}
		return ptStart;
	}
	/**
	 * 将世界(屏幕)坐标转化为地图坐标
	 * @param ptMouse
	 * @param tileWidth
	 * @param tileHeight
	 * @param offsetX
	 * @param offsetY
	 * @return
	 */
	public static Point mouseMapper(Point ptMouse,int tileWidth,int tileHeight,int offsetX,int offsetY){
		Point ptPlot=tilePlotter(new Point(0,0), tileWidth, tileHeight, offsetX, offsetY);
		ptMouse.x -= ptPlot.x;
		ptMouse.y -= ptPlot.y;
		
		Point ptMouseMapCoarse=new Point(0,0);
		ptMouseMapCoarse.x = ptMouse.x / tileWidth;
		ptMouseMapCoarse.y = ptMouse.y / tileHeight;
		
		Point ptMouseFine=new Point(0,0);
		ptMouseFine.x = ptMouse.x % tileWidth;
		ptMouseFine.y = ptMouse.y % tileHeight;
		if(ptMouseFine.x < 0){
			ptMouseFine.x += tileWidth;
			ptMouseMapCoarse.x --;
		}
		if(ptMouseFine.y < 0){
			ptMouseFine.y += tileHeight;
			ptMouseMapCoarse.y --;
		}
		
		Point ptMap=new Point(0,0);
		while(ptMouseMapCoarse.y < 0){
			ptMap=tileWalker(ptMap, IsoDirection.NORTH);
			ptMouseMapCoarse.y ++;
		}
		while(ptMouseMapCoarse.y > 0){
			ptMap=tileWalker(ptMap, IsoDirection.SOUTH);
			ptMouseMapCoarse.y --;
		}
		while(ptMouseMapCoarse.x < 0){
			ptMap=tileWalker(ptMap, IsoDirection.WEST);
			ptMouseMapCoarse.x ++;
		}
		while(ptMouseMapCoarse.x > 0){
			ptMap=tileWalker(ptMap, IsoDirection.EAST);
			ptMouseMapCoarse.x --;
		}
		
		if(!checkPosition(ptMouseFine.y,ptMouseFine.x).equals(IsoDirection.CENTER)){
			ptMap=tileWalker(ptMap, checkPosition(ptMouseFine.y,ptMouseFine.x));
		}
		return ptMap;
	}
	
	//暂代替颜色查找表
	private static IsoDirection checkPosition(int y1, int x1) {
		if(x1 <24  && y1 < 12 && y1 < -0.5*x1 + 12){
			return IsoDirection.NORTH_WEST;
		}else if(x1 > 24 && y1< 12  && y1 < 0.5*x1 -12 ){
			return IsoDirection.NORTH_EAST;
		}else if(x1 > 24 && y1 > 12 && y1 > -0.5*x1 +36){
			return IsoDirection.SOUTH_EAST;
		}else if(x1 < 24 && y1 > 12 && y1 > 0.5*x1 +12 ){
			return IsoDirection.SOUTH_WEST;
		}else
			return IsoDirection.CENTER;
	}	
	
	/**
	 * 取next相对于origin的方位，先只判断能行走的4个方向
	 * @param origin
	 * @param next
	 * @return
	 */
	public static IsoDirection getDirection(Point origin,Point next){
		IsoDirection direction=IsoDirection.SOUTH_WEST;
		if(origin.x > next.x)
			direction=IsoDirection.NORTH_EAST;
		else if(origin.y > next.y)
			direction=IsoDirection.NORTH_WEST;
		else if(origin.y < next.y)
			direction=IsoDirection.SOUTH_EAST;
		return direction;
	}
	/**
	 * 改变行动方向，-99为反身，1为逆时针，-1为顺时针
	 * @param delta
	 * @param direction
	 * @return
	 */
	public static IsoDirection changeDirection(int delta, IsoDirection direction) {
		if(delta == -99){ //反身 
			switch(direction){
			case NORTH_EAST:
				direction=IsoDirection.SOUTH_WEST;
				break;
			case SOUTH_WEST:
				direction=IsoDirection.NORTH_EAST;
				break;
			case NORTH_WEST:
				direction=IsoDirection.SOUTH_EAST;
				break;
			case SOUTH_EAST:
				direction=IsoDirection.NORTH_WEST;
			}
		}else if(delta ==1){//左右旋转
			switch(direction){
			case NORTH_EAST:
				direction=IsoDirection.NORTH_WEST;
				break;
			case SOUTH_WEST:
				direction=IsoDirection.SOUTH_EAST;
				break;
			case NORTH_WEST:
				direction=IsoDirection.SOUTH_WEST;
				break;
			case SOUTH_EAST:
				direction=IsoDirection.NORTH_EAST;
			}
		}else if(delta == -1){
			switch(direction){
			case NORTH_EAST:
				direction=IsoDirection.SOUTH_EAST;
				break;
			case SOUTH_WEST:
				direction=IsoDirection.NORTH_WEST;
				break;
			case NORTH_WEST:
				direction=IsoDirection.NORTH_EAST;
				break;
			case SOUTH_EAST:
				direction=IsoDirection.SOUTH_WEST;
			}			
		}
		return direction;
	}	
}