trying to get cross hair to change color when object is in the cross hair.

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Lover of games

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Posted: 20th May 2008 06:44

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Ok, i've tried to make it so that when the object is within the cross hair, the cross hair changes color, i'm not sure if you guys get what i'm saying. here is my code

+ Code Snippet


	for(int total = 2; total < 60; total++)
		{
			
			if(dbObjectScreenX(total) == dbScreenWidth()/2 && dbObjectScreenY(total) == dbScreenHeight()/2)
			{
				
				dbInk(dbRgb(255,0,0),0);
			}
		}

of course, it doesn't work, what am i doing wrong? is there a better way? damn it i even did this a long time ago

"Originally I was going to have a BS on it but you know how that would be. I can't walk around with the letters BS on me." More or less a qoute by Syndrome from Jack, Jack, attack

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Mc Koding

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Posted: 20th May 2008 08:12

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There is a post like right under this that gets the x&y of an object if its on screen and then you can use that or i think there is a logic problem. Because width/height of screen divided by two is lets say a 100X100 = 50X50 so you get 50 out of it, now use the person jason or somthings code to see if its in bounds of the thing also a crosshair ( image wise) would be a diffrent color image or color the image using ( forgot function name).

( Yesh i am candanain , get it over eh!)

Rendetion a farcry from DarkGDK

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Mc Koding

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Posted: 20th May 2008 08:14

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So i reviewed the code an see that it will only get it if the object is in the middle, so try making that with a nested loop and check if its in the range of lets say 16pixle

Rendetion a farcry from DarkGDK

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jezza

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Posted: 20th May 2008 09:14

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try this:

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		for(int total = 2; total < 60; total++)
		{
			
			if(dbObjectScreenX(total) < dbScreenWidth()/2+5 && dbObjectScreenX(total) > dbScreenWidth()/2-5 && dbObjectScreenY(total) > dbScreenHeight()/2-5 && dbObjectScreenY(total) < dbScreenHeight()/2+5)
			{
				
				dbInk(dbRgb(255,0,0),0);
			}
		}

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Posted: 20th May 2008 15:19

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thanks, jazzaa but that didn't work.

"Originally I was going to have a BS on it but you know how that would be. I can't walk around with the letters BS on me." More or less a qoute by Syndrome from Jack, Jack, attack

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jezza

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Posted: 20th May 2008 18:51

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ummm well are you redrawing the crosshair every frame? because with that command dbInk(dbRgb(255,0,0),0); you are not actually changing the crosshair colour, only the ink colour. This following code creates a black crosshair normally, that changes red when an object comes into veiw. i havnt tested it.

+ Code Snippet

//set vars for center of screen
int w=dbScreenWidth()/2;
int h=dbScreenHeight()/2;
//draw black corsshair
dbInk(dbRGB(255,0,0));
dbLine(w, h-5, w, h+5);
dbLine(w-5, h, w+5, h);
//check if objects in crosshair
for(int total = 2; total < 60; total++)
{
	if(dbObjectScreenX(total) < w+5 && dbObjectScreenX(total) > w-5 && dbObjectScreenY(total) > h-5 && dbObjectScreenY(total) < h+5)
	{
		//redraw crosshair as red
		dbInk(dbRgb(255,0,0),0);
		dbLine(w, h-5, w, h+5);
		dbLine(w-5, h, w+5, h);
	}
}

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jezza

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Posted: 20th May 2008 18:53

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sorry, that will give you syntax errors. Change the first dbInk to
dbInk(dbRGB(255,0,0),0);

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jezza

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Posted: 20th May 2008 18:55

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idiot old me. change that to dbInk(dbRGB(0,0,0),0); and the code works fine for me. You might want to experiment with
if(dbObjectScreenX(total) < w+5 && dbObjectScreenX(total) > w-5 && dbObjectScreenY(total) > h-5 && dbObjectScreenY(total) < h+5)
and increase the 5s to 10s or soemthing.

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Diggsey

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Posted: 20th May 2008 19:16

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Use pick object

ViewGUI - FREE GUI plugin + WYSIWYG editor
Curious? CLICK HERE!

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Slayer 706

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Posted: 21st May 2008 03:17

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Quote: "ummm well are you redrawing the crosshair every frame? because with that command dbInk(dbRgb(255,0,0),0); you are not actually changing the crosshair colour, only the ink colour. This following code creates a black crosshair normally, that changes red when an object comes into veiw. i havnt tested it."

That code will turn the crosshair red even if the camera is not facing the object. I tried this and it seemed to work:

+ Code Snippet

	if(dbObjectScreenX(total) < w+5 && dbObjectScreenX(total) > w-5 && dbObjectScreenY(total) > h-5 && dbObjectScreenY(total) < h+5)
	{
		if (!dbObjectInScreen(total) == 0)
		{
			//redraw crosshair as red
			dbInk(dbRgb(255,0,0),0);
			dbLine(w, h-5, w, h+5);
			dbLine(w-5, h, w+5, h);
		}
	}

Thanks for the code by the way, it was a huge help to me.

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Dark GDK / trying to get cross hair to change color when object is in the cross hair.