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demons breath

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Posted: 25th Oct 2009 22:27

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Sorry I just got DarkGDK today and I know I'm probably doing something very stupid but I'm having a little difficulty. I'm trying to make Tic Tac Toe (I've made it before in C++ but I lost the code and haven't touched C++ in years) and DarkBASIC but for some reason this array isn't storing data properly. I'm sorry if this is a n00bish question. Just trying to get my head round it.

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn   ( );
	dbSyncRate ( 60 );

// set ink & background colour
	DWORD foreground1 = dbRGB(60,60,60);
	DWORD background1 = dbRGB(250,250,250);
	dbInk(foreground1,background1);

int x=0;
	int y=0;

// board array
	int aBoard[2][2];
	aBoard[1][0] = 1;

// our main loop
	while ( LoopGDK ( ) )
	{
		dbCLS (background1);
		for(x=0; x<=3; x++)
		{
			dbLine(20,20+(x*100),320,20+(x*100));
			dbLine(20+(x*100),20,20+(x*100),320);
		}
		for(x=0; x<=2; x++)
		{
			for(y=0; y<=2; y++)
			{
				//if(dbMouseX()>(20+x*100) && dbMouseX()<(120+x*100) && dbMouseY()>(20+y*100) && dbMouseY()<(120+y*100)
				if(dbMouseX()>(20+x*100) && dbMouseX()<(120+x*100) && dbMouseY()>(20+y*100) && dbMouseY()<(120+y*100))
				{
					dbBox(21+(x*100),21+(y*100),120+(x*100),120+(y*100),dbRGB(200,30,30),dbRGB(200,100,100),dbRGB(200,100,100),dbRGB(200,200,200));
				}
				if(aBoard[x][y]==1)
				{
					dbLine(30+(x*100),30+(y*100),110+(x*100),110+(y*100));
					dbLine(110+(x*100),30+(y*100),30+(x*100),110+(y*100));
				}

}
		}

// update the screen
		dbSync ( );
	}

// return back to windows
	return;
}

+ Code Snippet

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function
void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn   ( );
	dbSyncRate ( 60 );

	// set ink & background colour
	DWORD foreground1 = dbRGB(60,60,60);
	DWORD background1 = dbRGB(250,250,250);
	dbInk(foreground1,background1);

	int x=0;
	int y=0;

	// board array
	int aBoard[2][2];
	aBoard[1][0] = 1;

	// our main loop
	while ( LoopGDK ( ) )
	{
		dbCLS (background1);
		for(x=0; x<=3; x++)
		{
			dbLine(20,20+(x*100),320,20+(x*100));
			dbLine(20+(x*100),20,20+(x*100),320);
		}
		for(x=0; x<=2; x++)
		{
			for(y=0; y<=2; y++)
			{
				//if(dbMouseX()>(20+x*100) && dbMouseX()<(120+x*100) && dbMouseY()>(20+y*100) && dbMouseY()<(120+y*100)
				if(dbMouseX()>(20+x*100) && dbMouseX()<(120+x*100) && dbMouseY()>(20+y*100) && dbMouseY()<(120+y*100))
				{
					dbBox(21+(x*100),21+(y*100),120+(x*100),120+(y*100),dbRGB(200,30,30),dbRGB(200,100,100),dbRGB(200,100,100),dbRGB(200,200,200));
				}
				if(aBoard[x][y]==1)
				{
					dbLine(30+(x*100),30+(y*100),110+(x*100),110+(y*100));
					dbLine(110+(x*100),30+(y*100),30+(x*100),110+(y*100));
				}

			}
		}

		// update the screen
		dbSync ( );
	}

	// return back to windows
	return;
}

The problem is that it isn't just [1][0] that's storing the value, it is also making a cross at [0][1] and [0][2]. Is there something stupid I'm doing here?

Also for some reason before you mouse over the grid some of the lines look too thick (the ones from top right to bottom left look 2 pixels wide instead of one) but as soon as the mouse enters the grid it resolves this issue itself.

Thanks

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-Bush

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Ultimate_H

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Joined: 11th Mar 2009

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Posted: 25th Oct 2009 22:38

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when you declare arrays you put the actual size of the array. what you have done is made a 2X2 grid instead of a 3X3 grid. but you do have it right when you are accessing it.

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demons breath

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Joined: 4th Oct 2003

Location: Surrey, UK

Posted: 25th Oct 2009 23:34

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I thought arrays started from 0? so a 3x3 grid would be [2][2] as each array access-y thing can be [0],[1] or [2]. I did put [3][3] at first but thought it would be easier to code using [2][2].

"A West Texas girl, just like me"
-Bush

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heyufool1

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Joined: 14th Feb 2009

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Posted: 25th Oct 2009 23:59 Edited at: 26th Oct 2009 00:00

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When you declare an array the size should be the actual size you want. So in your case when you declare the array you would declare it with the size of 3 but when you make references to it in your code the max size would be 2 and the first value would be 0.

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demons breath

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Location: Surrey, UK

Posted: 26th Oct 2009 05:25 Edited at: 26th Oct 2009 05:27

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Ah right thanks. I've just hopped on over from DarkBASIC to give this a try and there an array declared dim Array1(2,2) would let you use anything up to and including 2. Thanks for that.

Edit: Hmm... Now it's just in a different wrong place. I have one at (1,0) but also one at (2,0). It's probably something glaringly obvious, but I can't figure it.

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-Bush

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Ultimate_H

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Posted: 26th Oct 2009 05:40

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One other thing i notice is that you dont set the values in any of the spots of your array except for [1][0], which means that the other spots are most likeley being filled with some garbage number. I would suggest using a couple loops to populate the array with 0's. This may help.

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demons breath

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Location: Surrey, UK

Posted: 26th Oct 2009 05:51 Edited at: 26th Oct 2009 05:57

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OK Even weirder the circles work fine:

// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function

// Circle-drawing functions which:
// 1. make circles visible on the screen for those people who have the dbCircle bug,
// 2. make it possible to draw filled circles.
// The algorythm is copied from this article by John Kennedy:
// http://homepage.smc.edu/kennedy_john/BCIRCLE.PDF

// For filled circle: connect the calculated points
// with horizontal lines.
void PlotCircleLines(int CX, int CY, int X, int Y)
{
	dbLine(CX + X, CY + Y, CX - X, CY + Y);
	dbLine(CX - X, CY - Y, CX + X, CY - Y);
	dbLine(CX + Y, CY + X, CX + Y, CY - X);
	dbLine(CX - Y, CY + X, CX - Y, CY - X);
}

// For unfilled circle: plot the outline.
void PlotCirclePoints(int CX, int CY, int X, int Y)
{
	// These should be dots, but dbDot would disappear as well,
	// so we draw one-pixel-long lines.
	dbLine(CX + X, CY + Y, CX + X + 1, CY + Y + 1);
	dbLine(CX - X, CY + Y, CX - X + 1, CY + Y + 1);
	dbLine(CX - X, CY - Y, CX - X + 1, CY - Y + 1);
	dbLine(CX + X, CY - Y, CX + X + 1, CY - Y + 1);
	dbLine(CX + Y, CY + X, CX + Y + 1, CY + X + 1);
	dbLine(CX - Y, CY + X, CX - Y + 1, CY + X + 1);
	dbLine(CX - Y, CY - X, CX - Y + 1, CY - X + 1);
	dbLine(CX + Y, CY - X, CX + Y + 1, CY - X + 1);
}

// Parameters: center point coordinates, radius, filled or not.
void drawCircle(int CX, int CY, int R, bool Filled)
{
	int X, Y, XChange, YChange, RadiusError;

X = R;
	Y = 0;
	XChange = 1 - 2 * R;
	YChange = 1;
	RadiusError = 0;

while (X >= Y)
	{
		if (Filled) PlotCircleLines(CX, CY, X, Y);
		else PlotCirclePoints(CX, CY, X, Y);
		Y++;
		RadiusError += YChange;
		YChange += 2;
		if (2 * RadiusError + XChange > 0)
		{
			X--;
			RadiusError += XChange;
			XChange += 2;
		}
	}
}

void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn   ( );
	dbSyncRate ( 60 );

// set ink & background colour
	DWORD foreground1 = dbRGB(60,60,60);
	DWORD background1 = dbRGB(250,250,250);
	dbInk(foreground1,background1);

int x=0;
	int y=0;

// board array
	int aBoard[3][3];
	aBoard[1][0] = 1;
	aBoard[0][0] = 2;
	aBoard[2][1] = 2;
	aBoard[1][1] = 2;

// our main loop
	while ( LoopGDK ( ) )
	{
		dbCLS (background1);
		for(x=0; x<=3; x++)
		{
			dbLine(20,20+(x*100),320,20+(x*100));
			dbLine(20+(x*100),20,20+(x*100),320);
		}
		for(x=0; x<=2; x++)
		{
			for(y=0; y<=2; y++)
			{
				// find mouse position.
				if(dbMouseX()>(20+x*100) && dbMouseX()<(120+x*100) && dbMouseY()>(20+y*100) && dbMouseY()<(120+y*100))
				{
					// if the mouse is over a grid square draw a shaded box on it.
					dbBox(21+(x*100),21+(y*100),120+(x*100),120+(y*100),dbRGB(200,30,30),dbRGB(200,100,100),dbRGB(200,100,100),dbRGB(200,200,200));
				}
				if(aBoard[x][y]==1)
				{
					// draw crosses
					dbLine(30+(x*100),30+(y*100),110+(x*100),110+(y*100));
					dbLine(110+(x*100),30+(y*100),30+(x*100),110+(y*100));
				}
				if(aBoard[x][y]==2)
				{
					// draw noughts
					drawCircle(70+(x*100),70+(y*100),40,0);
				}
				//drawCircle(100,100,60,0);

}
		}

// update the screen
		dbSync ( );
	}

// return back to windows
	return;
}

+ Code Snippet


// whenever using Dark GDK you must ensure you include the header file
#include "DarkGDK.h"

// the main entry point for the application is this function

// Circle-drawing functions which:
// 1. make circles visible on the screen for those people who have the dbCircle bug,
// 2. make it possible to draw filled circles.
// The algorythm is copied from this article by John Kennedy:
// http://homepage.smc.edu/kennedy_john/BCIRCLE.PDF


// For filled circle: connect the calculated points
// with horizontal lines.
void PlotCircleLines(int CX, int CY, int X, int Y)
{
	dbLine(CX + X, CY + Y, CX - X, CY + Y);
	dbLine(CX - X, CY - Y, CX + X, CY - Y);
	dbLine(CX + Y, CY + X, CX + Y, CY - X);
	dbLine(CX - Y, CY + X, CX - Y, CY - X);
}

// For unfilled circle: plot the outline.
void PlotCirclePoints(int CX, int CY, int X, int Y)
{
	// These should be dots, but dbDot would disappear as well,
	// so we draw one-pixel-long lines.
	dbLine(CX + X, CY + Y, CX + X + 1, CY + Y + 1);
	dbLine(CX - X, CY + Y, CX - X + 1, CY + Y + 1);
	dbLine(CX - X, CY - Y, CX - X + 1, CY - Y + 1);
	dbLine(CX + X, CY - Y, CX + X + 1, CY - Y + 1);
	dbLine(CX + Y, CY + X, CX + Y + 1, CY + X + 1);
	dbLine(CX - Y, CY + X, CX - Y + 1, CY + X + 1);
	dbLine(CX - Y, CY - X, CX - Y + 1, CY - X + 1);
	dbLine(CX + Y, CY - X, CX + Y + 1, CY - X + 1);
}

// Parameters: center point coordinates, radius, filled or not.
void drawCircle(int CX, int CY, int R, bool Filled)
{
	int X, Y, XChange, YChange, RadiusError;

	X = R;
	Y = 0;
	XChange = 1 - 2 * R;
	YChange = 1;
	RadiusError = 0;

	while (X >= Y)
	{
		if (Filled) PlotCircleLines(CX, CY, X, Y);
		else PlotCirclePoints(CX, CY, X, Y);
		Y++;
		RadiusError += YChange;
		YChange += 2;
		if (2 * RadiusError + XChange > 0)
		{
			X--;
			RadiusError += XChange;
			XChange += 2;
		}
	}
}









void DarkGDK ( void )
{
	// turn on sync rate and set maximum rate to 60 fps
	dbSyncOn   ( );
	dbSyncRate ( 60 );

	// set ink & background colour
	DWORD foreground1 = dbRGB(60,60,60);
	DWORD background1 = dbRGB(250,250,250);
	dbInk(foreground1,background1);

	int x=0;
	int y=0;

	// board array
	int aBoard[3][3];
	aBoard[1][0] = 1;
	aBoard[0][0] = 2;
	aBoard[2][1] = 2;
	aBoard[1][1] = 2;

	// our main loop
	while ( LoopGDK ( ) )
	{
		dbCLS (background1);
		for(x=0; x<=3; x++)
		{
			dbLine(20,20+(x*100),320,20+(x*100));
			dbLine(20+(x*100),20,20+(x*100),320);
		}
		for(x=0; x<=2; x++)
		{
			for(y=0; y<=2; y++)
			{
				// find mouse position.
				if(dbMouseX()>(20+x*100) && dbMouseX()<(120+x*100) && dbMouseY()>(20+y*100) && dbMouseY()<(120+y*100))
				{
					// if the mouse is over a grid square draw a shaded box on it.
					dbBox(21+(x*100),21+(y*100),120+(x*100),120+(y*100),dbRGB(200,30,30),dbRGB(200,100,100),dbRGB(200,100,100),dbRGB(200,200,200));
				}
				if(aBoard[x][y]==1)
				{
					// draw crosses
					dbLine(30+(x*100),30+(y*100),110+(x*100),110+(y*100));
					dbLine(110+(x*100),30+(y*100),30+(x*100),110+(y*100));
				}
				if(aBoard[x][y]==2)
				{
					// draw noughts
					drawCircle(70+(x*100),70+(y*100),40,0);
				}
				//drawCircle(100,100,60,0);

			}
		}

		// update the screen
		dbSync ( );
	}



	// return back to windows
	return;
}

(circle function from http://forum.thegamecreators.com/?m=forum_view&t=158250&b=22&p=0)

EDIT: You were right. How odd. I assumed that unless otherwise declared, variables were 0. That wouldn't explain why the circles weren't affected if it was just completely random numbers. Or would it. Oh well thanks for the help mate you're a legend I had no idea what was going on there.