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# load matrix from a txt file

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Hello! i want to draw objects using openGL (c++) from a matrix, i do this with no problem if i declare the matrix, and call like this:
#define SIZE_L   10
#define SIZE_C   15
char map[SIZE_L][SIZE_C+1] = {
"##$############", "####$##########",
"######%########",
};


call the matrix map:
void draw()
{
glPushMatrix();
glTranslatef(-SIZE_L , 0.01, -SIZE_C);
for(int i=0; i<SIZE_L; i++)
for(int j=0; j<SIZE_C+1; j++)
{
if(map[j]=='#')
drawObject1();
(...)
glPopMatrix();
}

..now i want to draw objects from a matrix but load the matrix from a txt file (for example map.txt). how can i call this file and what do i need (if possible give me a example)? Thank you guys !!

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Quote:
 Original post by langkow..now i want to draw objects from a matrix but load the matrix from a txt file (for example map.txt). how can i call this file and what do i need (if possible give me a example)?Thank you guys !!

I just use ifstream (input file stream) to read from a file. It's easy. Here is an example of using ifstream to read a text file.

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