启动一个类的二维数组 [英] initiating a 2d array of a class
问题描述
嗯......不太确定怎么说这个。
i得到这个来编译..我不知道什么是正确的语法
这是...希望它是自我解释的。
这里是我的班级：
------
class TileMap
{
public：
int xw，yw;
int tw，th;
int rows，cols;
int fullrows，fullcols;
int minX，minY，maxX，maxY;
TileMapCell **网格;
TileMap（int rows，int cols，int xw，int yw）：rows（rows），
cols（cols），xw（xw），yw（yw）
{
tw = xw * 2;
th = yw * 2;
fullrows = rows + 2;
fullcols = cols + 2;
minX = tw;
minY = th;
maxX = tw +（行* tw）;
maxY = th +（行* th）;
}
TileMapCell GetTile_S（int x，int y）
{
返回网格[int（x / tw） ] [int（y / th）];
}
TileMapCell GetTile_V（Vector2 v）
{
返回grid [int（vx / tw）] [int（vy / th）];
}
TileMapCell GetTile_I（int x，int y）
{
return grid [x] [y] ;
}
void GetIndex_S（Vector2 v，int x，int y）
{
vx = int（x / tw）;
vy = int（y / th）;
}
void GetIndex_V （Vector2 v，Vector2 p）
{
vx = int（px / tw）;
vy = int（py / th）;
}
void Building（）
{
int x = xw;
int y = yw;
int fullrows = fullrows; //网格的ACTUAL大小，包括
边框瓷砖
int fullcols = fullcols;
int rows = rows;
int cols = cols;
//构建原始瓦片
for（int i = 0;我< fullrows; i ++）
{
grid [i] = new TileMapCell [fullcols]; //< ---需要帮助!!!
for（int j = 0; j< fullcols; j ++）
{
grid [i] [j] = new TileMapCell（i，j，x，y，xw，yw）;
y + = th;
}
x + = tw;
y = yw;
}
}
};
--------------------
问题在这里：
- ----------------
//构建原始图块
for（int i = 0; i< fullrows; i ++ ）
{
grid [i] = new TileMapCell [fullcols]; //< ---需要帮助!!!
for（int j = 0; j< fullcols; j ++）
{
grid [i] [j] = new TileMapCell（i，j，x，y，xw，yw）;
y + = th;
}
x + = tw;
y = yw;
}
------------- ----
并且你想要问：
------------
class TileMapCell
{
public：
int ID;
int CTYPE;
int i，j; //网格中的图块索引
TileMapCell * nU，* nD，* nL，* nR; //邻近的瓷砖
int eU，eD，eL，eR; //边缘信息
float gx; //环境属性
浮动;
浮动d;
TileMapCell * next，* prev;
Vector2 pos;
int xw，yw;
float minx，maxx，miny，maxy;
int signx，signy，sx，sy;
TileMapCell（int i，int j，float x，float y，int xw，int yw ）：我（i），
j（j），xw（xw），yw（yw）
{
pos.set（x ，y）;
gx = 0;
gy = GRAV;
d = DRAG;
nU = nD = nL = nR = NULL;
eU = eD = eL = eR = EID_OFF;
next = prev = NULL;
minx = pos.x - xw;
maxx = pos.x + xw;
miny = pos.y - yw;
maxy = pos.y + yw;
signx = signy = sx = sy = 0;
}
无效LinkU（TileMapCell * t）
{
nU = t;
}
void LinkD（TileMapCell * t）
{
nD = t;
}
void LinkL （TileMapCell * t）
{
nL = t;
}
void LinkR（TileMapCell * t）
{
nR = t;
}
};
---- ---------------
和你告诉我之前
grid [i] = new TileMapCell [fullcols] ;
不起作用，因为没有TileMapCell（）构造函数....我知道。
但它不应该在那时构建任何东西.. 。对吗？
如果您需要更多信息..只需留言。
感谢您的帮助。
uhhmmm... not really sure how to word this.
i cant get get this to compile.. i''m not sure what the proper syntax to
do this is.. hopefully it''s self explanatory.
here''s my class:
------
class TileMap
{
public:
int xw, yw;
int tw, th;
int rows, cols;
int fullrows, fullcols;
int minX, minY, maxX, maxY;
TileMapCell **grid;
TileMap(int rows, int cols, int xw, int yw) : rows(rows),
cols(cols), xw(xw), yw(yw)
{
tw = xw*2;
th = yw*2;
fullrows = rows+2;
fullcols = cols+2;
minX = tw;
minY = th;
maxX = tw + (rows*tw);
maxY = th + (rows*th);
}
TileMapCell GetTile_S(int x, int y)
{
return grid[int(x/tw)][int(y/th)];
}
TileMapCell GetTile_V(Vector2 v)
{
return grid[int(v.x/tw)][int(v.y/th)];
}
TileMapCell GetTile_I(int x, int y)
{
return grid[x][y];
}
void GetIndex_S(Vector2 v, int x, int y)
{
v.x = int(x/tw);
v.y = int(y/th);
}
void GetIndex_V(Vector2 v, Vector2 p)
{
v.x = int(p.x/tw);
v.y = int(p.y/th);
}
void Building()
{
int x = xw;
int y = yw;
int fullrows = fullrows;//the ACTUAL size of the grid, including
border tiles
int fullcols = fullcols;
int rows = rows;
int cols = cols;
//build raw tiles
for(int i = 0; i < fullrows; i++)
{
grid[i] = new TileMapCell[fullcols]; // <--- need help here!!!
for(int j = 0; j < fullcols; j++)
{
grid[i][j] = new TileMapCell(i,j,x,y,xw,yw);
y += th;
}
x += tw;
y = yw;
}
}
};
--------------------
the problem is in here:
------------------
//build raw tiles
for(int i = 0; i < fullrows; i++)
{
grid[i] = new TileMapCell[fullcols]; // <--- need help here!!!
for(int j = 0; j < fullcols; j++)
{
grid[i][j] = new TileMapCell(i,j,x,y,xw,yw);
y += th;
}
x += tw;
y = yw;
}
-----------------
and incase you were about to ask:
------------
class TileMapCell
{
public:
int ID;
int CTYPE;
int i,j; // index of tile in grid
TileMapCell *nU, *nD, *nL, *nR; // neighboring tiles
int eU, eD, eL, eR; // edge info
float gx; // environmental properties
float gy;
float d;
TileMapCell *next, *prev;
Vector2 pos;
int xw, yw;
float minx, maxx, miny, maxy;
int signx, signy, sx, sy;
TileMapCell(int i, int j, float x, float y, int xw, int yw) : i(i),
j(j), xw(xw), yw(yw)
{
pos.set(x,y);
gx = 0;
gy = GRAV;
d = DRAG;
nU = nD = nL = nR = NULL;
eU = eD = eL = eR = EID_OFF;
next = prev = NULL;
minx = pos.x - xw;
maxx = pos.x + xw;
miny = pos.y - yw;
maxy = pos.y + yw;
signx = signy = sx = sy = 0;
}
void LinkU(TileMapCell *t)
{
nU = t;
}
void LinkD(TileMapCell *t)
{
nD = t;
}
void LinkL(TileMapCell *t)
{
nL = t;
}
void LinkR(TileMapCell *t)
{
nR = t;
}
};
-------------------
and before you tell me
grid[i] = new TileMapCell[fullcols];
doesnt work because there is no TileMapCell() constructor.... I know.
but it shouldnt really be constructing anything at that point... right?
if you need more info.. just leave a message.
thanks for the help.
推荐答案
Mark写道：
....
Mark wrote:
....
在你告诉我之前
grid [i] = new TileMapCell [fullcols];
不起作用，因为没有TileMapCell（）构造函数....我知道。
但它不应该真的是在这一点上构建任何东西......对吗？
如果您需要更多信息..只需留言。
and before you tell me
grid[i] = new TileMapCell[fullcols];
doesnt work because there is no TileMapCell() constructor.... I know.
but it shouldnt really be constructing anything at that point... right?
if you need more info.. just leave a message.
看来你想要创建一个指针数组
TileMapCell.grid [i] =新的TileMapCell * [fullcols];
It appears you want to create an array of pointers to
TileMapCell.grid[i] = new TileMapCell*[fullcols];
hmm ..？
感谢快速回复...但这没有任何意义......
基本上如果＃代表一个单元格，如果我的理解是正确的，那么
grid [i]代表
＃
＃
＃
＃
....
我们想在x维度添加一些单元格...
###
###
###
## ＃
....
但是你说的是我们在2D /或其他（* []）中添加2D内容每行
??
反正..我试过了，并且
grid [i] = new TileMapCell * [fullcols]; //< ---需要帮助!!!
也没编译。
说：
无法转换` TileMapCell **''到'TileMapCell *''在任务中
所以就像我说..它试图把2维的东西变成
1 ...
hmm..?
thanks for the fast reply... but that doesn''t make any sense...
basically if # represents a cell, if my understanding is correct, then
grid[i] would represent
#
#
#
#
....
and we want to add some cells to the x dimension...
###
###
###
###
....
but what you''re saying is we add a 2D something or other ( *[] ) to
each row??
anyways.. i tried that, and
grid[i] = new TileMapCell*[fullcols]; // <--- need help here!!!
doesnt compile either.
says:
cannot convert `TileMapCell**'' to `TileMapCell*'' in assignment
so like i said.. its trying to turn something with 2 dimensions into
something with 1...
*标记：
嗯...不太确定怎么说这个。
我不能得到这个编译..我不知道
这样做的正确语法是什么..希望它是自我解释的。
解决方案：使用标准库类，并使用Boost库，
_don''t_做原始数组或原始指针。
这里是我的班级：
------
类TileMap
{
公开：
int xw，yw;
int tw，th;
int rows，cols;
int fullrows，fullcols;
int minX，minY，maxX，maxY;
当然你不希望上述成员公开。将它们设为私有。
TileMapCell ** grid;
uhhmmm... not really sure how to word this.
i cant get get this to compile.. i''m not sure what the proper syntax to
do this is.. hopefully it''s self explanatory.
Solution: use standard library classes, and use the Boost library, and
_don''t_ do raw arrays or raw pointers.
here''s my class:
------
class TileMap
{
public:
int xw, yw;
int tw, th;
int rows, cols;
int fullrows, fullcols;
int minX, minY, maxX, maxY;
Surely you don''t want the above members public. Make them private.
TileMapCell **grid;
转到< url：http：//www.boost .org / libs / multi_array / doc / user.html> ;.
Hth。，
- Alf
-
答：因为它弄乱了人们通常阅读文字的顺序。
问：为什么这么糟糕？
A：热门发布。
问：usenet和电子邮件中最烦人的事情是什么？
Go to <url: http://www.boost.org/libs/multi_array/doc/user.html>.
Hth.,
- Alf
--
A: Because it messes up the order in which people normally read text.
Q: Why is it such a bad thing?
A: Top-posting.
Q: What is the most annoying thing on usenet and in e-mail?
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