Lesson 12 Tic Tac Toe Line Problen

[bmangoogle]

On lesson 12 when you make the grid for the tic tac toe game I put the exact same code but my grid looks like this http://i.imgur.com/qGt2x.png
I think I might of messed something up in the DrawLine function.
Could someone give me the code for DrawLine?

[Craigspaz]

Here is the code in the DrawLine function that is in the D3DGraphics.cpp file. Don't forget to put
" void DrawLine( int x1, int y1, int x2, int y2, int r, int g, int bl ) " in the D3DGraphic.h file.

Code: Select all

void D3DGraphics::DrawLine( int x1, int y1, int x2, int y2, int r, int g, int bl )
{
	int dx = x2 - x1;
	int dy = y2 - y1;
	

	if( abs( dy ) > abs( dx ) )
	{
		if( y1 > y2 )
		{
			int temp = y2;
			y2 = y1;
			y1 = temp;
			temp =  x2;
			x2 =  x1;
			x1 = temp;
		}
		float m = (float)dx / (float)dy;
		float b = x1 - m*y1;
		for( int y = y1; y <= y2; y++ )
		{
			int x = m*y + b + 0.5f;
			PutPixel( x,y,r,g,bl );
		}
	}
	else
	{
		if( x1 > x2 )
		{
			int temp = y2;
			y2 = y1;
			y1 = temp;
			temp =  x2;
			x2 =  x1;
			x1 = temp;
		}
		float m = (float)dy / (float)dx;
		float b = y1 - m*x1;
		for( int x = x1; x <= x2; x++ )
		{
			int y = m*x + b + 0.5f;
			PutPixel( x,y,r,g,bl );
		}
	}
}

[LuX]

I'd guess you have something messed in the draw line too. Or maybe just missed some of the Y values to draw the lines.

But I wouldn't recommend just copy pasting the code. Part of coding is to solve it your self, at least try. Instead of just copy pasting it , try to compare the codes and see what you did wrong and rewrite it yourself.

[chili]

But I wouldn't recommend just copy pasting the code. Part of coding is to solve it your self, at least try. Instead of just copy pasting it , try to compare the codes and see what you did wrong and rewrite it yourself.

Word. If you can't manage a non-optimized line drawing algorithm then you might as well forget about programming anything 3D.