map[y][x+1] prob

This is a discussion on map[y][x+1] prob within the C++ Programming forums, part of the General Programming Boards category; hey, i got a problem, i'm trying to create a 2d map from a 2 dimensional array, with x,y and ...

  1. #1
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    Jan 2004
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    4

    map[y][x+1] prob

    hey,

    i got a problem, i'm trying to create a 2d map from a 2 dimensional array, with x,y and z in it.

    when i add the lines to raise the z he gives a array, i think its somethign in my syntax:

    sy1 = sy - map[y][x];
    ey1 = sy - map[y][x+1];
    sy2 = ey - map[y+1][x];
    ey2 = ey - map[y+1][x+1];

    can someone help me ?

    Code:
    int DrawGLScene(GLvoid){
    	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    	glLoadIdentity();
    
    	GLfloat x, y;
    
    	int maxX = 10;
    	int maxY = 10;
    
    	int mX,mY,sy,ey,sx1,sx2,ex1,ex2,sy1,sy2,ey1,ey2;
    
    	mX = maxX * gridX + maxY * gridX;
    	mY = maxY * gridX;
    
    	for ( y=0; y < maxY; y++ )
    	{
    		sy = y * gridY;
    		ey = sy + gridY;
    
    		for (x=0; x < maxX; x++ )
    		{
    			sx1 = x - ( ( mX - x ) * gridX + ( y * gridX ) );
    			ex1 = sx1 + gridX;
    
    			sx2 = sx1 - gridX;
    			ex2 = ex1 - gridX;
    
    			sy1 = sy - map[y][x];
    			ey1 = sy - map[y][x+1];
    
    			sy2 = ey - map[y+1][x];
    			ey2 = ey - map[y+1][x+1];
    
    			glColor3f(1.0,0.5f,1.0f);	
    
    			glBegin(GL_QUADS);
    				glVertex3f( sx1, sy1, 0.0f);
    				glVertex3f( ex1, ey1, 0.0f);
    				glVertex3f( ex2, ey2, 0.0f);
    				glVertex3f( sx2, sy2, 0.0f);
    			glEnd();
    
    			glLoadIdentity();
    		}
    	}	
    
    	return TRUE;										// Keep Going
    }
    compiling:
    Code:
    C:\Documents and Settings\Maurad3r\Bureaublad\Lesson04\lesson4.cpp(101) : error C2108: subscript is not of integral type
    C:\Documents and Settings\Maurad3r\Bureaublad\Lesson04\lesson4.cpp(101) : error C2108: subscript is not of integral type
    C:\Documents and Settings\Maurad3r\Bureaublad\Lesson04\lesson4.cpp(101) : error C2113: pointer can only be subtracted from another pointer
    C:\Documents and Settings\Maurad3r\Bureaublad\Lesson04\lesson4.cpp(102) : error C2108: subscript is not of integral type
    C:\Documents and Settings\Maurad3r\Bureaublad\Lesson04\lesson4.cpp(102) : error C2108: subscript is not of integral type
    C:\Documents and Settings\Maurad3r\Bureaublad\Lesson04\lesson4.cpp(102) : error C2113: pointer can only be subtracted from another pointer
    C:\Documents and Settings\Maurad3r\Bureaublad\Lesson04\lesson4.cpp(104) : error C2108: subscript is not of integral type
    C:\Documents and Settings\Maurad3r\Bureaublad\Lesson04\lesson4.cpp(104) : error C2108: subscript is not of integral type
    C:\Documents and Settings\Maurad3r\Bureaublad\Lesson04\lesson4.cpp(104) : error C2113: pointer can only be subtracted from another pointer
    C:\Documents and Settings\Maurad3r\Bureaublad\Lesson04\lesson4.cpp(105) : error C2108: subscript is not of integral type
    C:\Documents and Settings\Maurad3r\Bureaublad\Lesson04\lesson4.cpp(105) : error C2108: subscript is not of integral type
    C:\Documents and Settings\Maurad3r\Bureaublad\Lesson04\lesson4.cpp(105) : error C2113: pointer can only be subtracted from another pointer

  2. #2
    and the hat of int overfl Salem's Avatar
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    > error C2108: subscript is not of integral type
    So stop using floats to index arrays
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
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