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2.5D地图坐标转换

作者：追风剑情 发布于：2016-6-21 11:53 分类：Algorithms

语言：C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Drawing;

namespace MapEditor.Map
{
    /// <summary>
    /// 2.5D地图坐标转换工具类
    /// </summary>
    public class CoordinateUtil
    {
        /// <summary>
        /// 像素坐标转网格坐标
        /// </summary>
        /// <param name="tileWidth">网格宽度</param>
        /// <param name="tileHeight">网格高度</param>
        /// <param name="px">像素x坐标</param>
        /// <param name="py">像素y坐标</param>
        /// <returns></returns>
        public static Point GetCellPoint(int tileWidth, int tileHeight, int px, int py)
		{
			int xtile = 0;	//网格的x坐标
			int ytile = 0;	//网格的y坐标
	
	        int cx, cy, rx, ry;
	        cx = (int)(px / tileWidth) * tileWidth + tileWidth/2;	//计算出当前X所在的以tileWidth为宽的矩形的中心的X坐标
	        cy = (int)(py / tileHeight) * tileHeight + tileHeight/2;//计算出当前Y所在的以tileHeight为高的矩形的中心的Y坐标
	
	        rx = (px - cx) * tileHeight/2;
	        ry = (py - cy) * tileWidth/2;
	
	        if (Math.Abs(rx)+Math.Abs(ry) <= tileWidth * tileHeight/4)//<=上三角面积
	        {
				xtile = (int)(px / tileWidth);
				ytile = (int)(py / tileHeight) * 2;
	        }
	        else
	        {//偶行
				px = px - tileWidth/2;
				xtile = (int)(px / tileWidth) + 1;
				
				py = py - tileHeight/2;
				ytile = (int)(py / tileHeight) * 2 + 1;
			}

			return new Point(xtile - (ytile&1), ytile);
		}

        /// <summary>
        /// 网格坐标转像素坐标
        /// </summary>
        /// <param name="tileWidth">网格宽度</param>
        /// <param name="tileHeight">网格高度</param>
        /// <param name="tx">网格x坐标</param>
        /// <param name="ty">网格y坐标</param>
        /// <returns></returns>
        public static Point GetPixelPoint(int tileWidth, int tileHeight, int tx, int ty)
		{
			//偶数行tile中心
			int tileCenter = (tx * tileWidth) + tileWidth/2;
			// x象素  如果为奇数行加半个宽
			int xPixel = tileCenter + (ty&1) * tileWidth/2;
			// y象素
			int yPixel = (ty + 1) * tileHeight/2;
			
			return new Point(xPixel, yPixel);
		}

        /// <summary>
        /// 根据网格索引取得网格坐标
        /// </summary>
        /// <param name="gindex">网格索引</param>
        /// <param name="cols">网格列数</param>
		public static Point GetICellPoint( int gindex, int cols )
		{
			int xtile = gindex % cols;
			int ytile = gindex / cols;
			
			return new Point(xtile, ytile);
		}
		
		/// <summary>
		/// 根据网格索引取得象素坐标
		/// </summary>
		/// <param name="gindex">网格索引</param>
        /// <param name="cols">网格列数</param>
        /// <param name="rows">网格行数</param>
        /// <param name="tileWidth">网格宽度</param>
        /// <param name="tileHeight">网格高度</param>
		/// <returns></returns>
		public static Point GetIPixelPoint( int gindex, int cols, int rows, int tileWidth, int tileHeight )
		{
			Point cellPoint = GetICellPoint(gindex, cols);
			Point pixelPoint = GetPixelPoint(tileWidth, tileHeight, cellPoint.X, cellPoint.Y);
			
			return pixelPoint;
		}
		
		/// <summary>
        /// 根据网格坐标取得网格索引
		/// </summary>
		/// <param name="gx">网格x坐标</param>
		/// <param name="gy">网格y坐标</param>
		/// <param name="cols">网格列数</param>
		/// <returns></returns>
		public static int GetCellIndex( int gx, int gy, int cols )
		{
			int gindex = gy * cols + gx;
			
			return gindex;
		}
    }
}

标签: Algorithms