flashing/repeating object, dbLoopObject doesnt work

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thm120

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Posted: 11th Jun 2009 01:35

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making an object sorta flash in itself, lets say i have a white image and i want it to flash and keep flashing when the mouse button is pressed..
by flash i mean
:: flash = appear then dissapear, or reduce opacity then increase opacity/reduce transparency the increase transparency.
i cant seem to figure out how to do it,
i tried the loop command but doesnt really work

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thm120

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Posted: 12th Jun 2009 05:42

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seriously anything? i searched, didnt find anything useful , btw here is the game i'm making, what i need to make flash in and out is the white part of the scope http://www.youtube.com/watch?v=1AxNdvluqq4

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AlexI

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Posted: 12th Jun 2009 17:43 Edited at: 12th Jun 2009 17:43

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LOL that video made me laugh.

I still dont understand exactly what you want.

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thm120

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Posted: 13th Jun 2009 04:12

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u know the part when i zoom into the scope, when you shoot, a white flash comes across the scope, when you hold the mouse button the white flash stays there without moving or anything, i wanted the flash to sorta pulse in and out really fast as the mouse button is held down.

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Bran flakes91093

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Posted: 13th Jun 2009 05:14 Edited at: 13th Jun 2009 05:45

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You could make a static variable (or make a class/struct) that you use to set a sprite's transparency with dbSetSpriteAlpha(int Sprite, int Transparency) with 255 being completely solid and 0 being invisible. Then you can increase/decrease the variable and set the sprite's transparency with it. This:

+ Code Snippet

static int trans = 0;
static int iter = 0;
if(dbMouseClick() == 1) {
    if(trans < 256 && iter != -70)
	iter = 70; // Become more solid
    else if(trans > -1)
	iter = -70; // Less
    else
	iter = 70; // More
    trans += iter;
    dbSetSpriteAlpha(1, trans);
}
else if(trans != 0) {
    trans = 0;
    dbSetSpriteAlpha(1, trans);
}
dbSprite(1, 0, 0, 1);

Should work, but I haven't tested it and have never tried to do what you want to achieve.

EDIT: Works now.

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thm120

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Posted: 13th Jun 2009 06:38

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wait wat?

this whole sprite talk got me confused, and sorta thirty,how would i make a static variable (or make a class/struct)? i thought sprites were for 2d games so i really never bothered to learn about em......can u please explain it to me as if i was a noob?

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kklouzal

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Posted: 13th Jun 2009 06:45 Edited at: 13th Jun 2009 06:47

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was?

Basically, you get your gun's "flash" as an image, load it up into the game then convert to a sprite, every frame fix it to the tip of the guns barrel.

You probably want to set the sprites alpha to 0 initially.

Every time a "bullet" comes out of the gun, make the sprites alpha go to 255 for a few frames then back to 0.

The end result is a muzzle flash when your gun fires, just like on real guns

BANG! BANG!

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Merak Spielman

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Posted: 13th Jun 2009 09:32

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A lot of 3d games use sprites - essentially a 2d image suspended in 3d space. They're used for decals, to indicate bulletholes or damage to character models, for instance. They're used for HUD displays, health bars, and so on. You'll need them for menu screens. You can use them to add a visual effect to the screen - like the white flash you're talking about. Much simpler to add a semi-transparent 2d sprite across the entire screen than to make a 3d lighting effect (and faster). You could also use red flashes to indicate damage, or green flashes for poison, etc.

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kklouzal

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Posted: 13th Jun 2009 09:47

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Just thought of this, Alternatively you could just have the muzzle flare as part of your guns animation.

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thm120

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Posted: 13th Jun 2009 19:21

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i would love to do all this great stuff you are all suggesting the problem now is, i load the image, position it, now how do i convert it to a sprite?

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Bran flakes91093

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Posted: 13th Jun 2009 20:00

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Use dbSprite() instead of pasting the image. Look in the documentation for it <Drive with DarkGDK>:\Program Files\The Game Creators\Dark GDK\Documentation\Dark GDK.chm

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thm120

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Posted: 15th Jun 2009 23:42

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ok i keep trying but it just wont work, i tried to deviate away from my original game code and make a whole new thing just to test the code i was given heres wat i came up with (which didnt work)

+ Code Snippet

// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple project that uses Dark GDK
// it contains the basic code for a GDK application

// 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 );
dbSprite(1,10,10,"gunflash.png");
	// our main loop
	while ( LoopGDK ( ) )
	{
		static int trans = 0;
static int iter = 0;
if(dbMouseClick() == 1) {
    if(trans < 256 && iter 1= -70)
	iter = 70; // Become more solid
    else if(trans > -1)
	iter = -70; // Less
    else
	iter = 70; // More
    trans += iter;
    dbSetSpriteAlpha(1, trans);
}
else if(trans 1= 0) {
    trans = 0;
    dbSetSpriteAlpha(1, trans);
}
dbSprite(1, 0, 0, 1);
		// update the screen
		dbSync ( );
	}

	// return back to windows
	return;
}

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Bran flakes91093

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Posted: 16th Jun 2009 04:28

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Okay, there are a couple of things wrong.

1. Typo: "else if(trans 1= 0)" should be "else if(trans != 0)"

2. A sprite needs to have an image loaded first. You need to load the image, and then make the sprite.

+ Code Snippet

// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple project that uses Dark GDK
// it contains the basic code for a GDK application

// 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 );
dbLoadImage(1, "gunflash.png");
dbSprite(1,10,10,1);
	// our main loop
	while ( LoopGDK ( ) )
	{
		static int trans = 0;
static int iter = 0;
if(dbMouseClick() == 1) {
    if(trans < 256 && iter 1= -70)
	iter = 70; // Become more solid
    else if(trans > -1)
	iter = -70; // Less
    else
	iter = 70; // More
    trans += iter;
    dbSetSpriteAlpha(1, trans);
}
else if(trans != 0) {
    trans = 0;
    dbSetSpriteAlpha(1, trans);
}
dbSprite(1, 0, 0, 1);
		// update the screen
		dbSync ( );
	}

	// return back to windows
	return;
}

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thm120

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Posted: 16th Jun 2009 05:50 Edited at: 16th Jun 2009 05:53

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still no joy

+ Code Snippet

// Dark GDK - The Game Creators - www.thegamecreators.com

// the wizard has created a very simple project that uses Dark GDK
// it contains the basic code for a GDK application

// 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 );
dbLoadImage("gunflash.png",1);
dbSprite(1,10,10,1);
	// our main loop
	while ( LoopGDK ( ) )
	{
static int trans = 0;
static int iter = 0;
if(dbMouseClick() == 1) {
    if(trans < 256 && iter 1= -70)
	iter = 70; // Become more solid
    else if(trans > -1)
	iter = -70; // Less
    else
	iter = 70; // More
    trans += iter;
    dbSetSpriteAlpha(1, trans);
}
else if(trans != 0) {
    trans = 0;
    dbSetSpriteAlpha(1, trans);
}
dbSprite(1, 0, 0, 1);
		// update the screen
		dbSync ( );
	}

	// return back to windows
	return;
}

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Bran flakes91093

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Posted: 16th Jun 2009 14:10

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Yeah, sorry I had 2 typos in that

Here:

+ Code Snippet

void DarkGDK(void) {
	dbSyncOn();
	dbSyncRate(60);

	dbLoadImage("gunflash.png", 1);
	dbSprite(1, 0, 0, 1);
	dbSizeSprite(1, 500, 500);
	dbSetSpriteAlpha(1, 0);

	while(LoopGDK()) {
		dbCLS();
		static int trans = 0;
		static int iter = 0;
		if(dbMouseClick() == 1) {
			if(trans < 256 && iter != -70)
				iter = 70;
			else if(trans > -1)
				iter = -70;
			else
				iter = 70;
			trans += iter;
			dbSetSpriteAlpha(1, trans);
		}
		else if(trans != 0) {
			trans = 0;
			dbSetSpriteAlpha(1, trans);
		}
		dbSprite(1, 0, 0, 1);
		dbSync();
	}
	return;
}

PS - You really should learn to use the output window in visual studio. You can double click on each error and the cursor will be set on the line that is the problem. It is usually straightforward enough to fix typos.

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thm120

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Posted: 16th Jun 2009 15:04

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ya i pressed f in that window and it pointed to the lines, i dont know that much about this sorta stuff yet so i didnt know what to fix

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thm120

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Posted: 16th Jun 2009 15:10 Edited at: 16th Jun 2009 16:02

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PERFECT! THANKS A MILLION!!!!!! I KNEW I COULD COUNT ON YOU GENIUSES FOR HELP!!!(I'm not being sarcastic, i'm serious) WOOOO!!!! now to move the sprite into the correct place and make it gently fade out when mouse i sreleased(if thats possible);

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Bran flakes91093

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Posted: 16th Jun 2009 18:33

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Almost anything is possible!

Here's what I think you are looking for.

+ Code Snippet

void DarkGDK(void) {
	dbSyncOn();
	dbSyncRate(60);

	dbLoadImage("gunflash.png", 1);
	dbSprite(1, 0, 0, 1);
	dbSizeSprite(1, 500, 500);
	dbSetSpriteAlpha(1, 0);

	while(LoopGDK()) {
		dbCLS();
		static int trans = 0;
		static int iter = 0;
		if(dbMouseClick() == 1) {
			if(trans < 256 && iter != -70)
				iter = 70;
			else if(trans > -1)
				iter = -70;
			else
				iter = 70;
			trans += iter;
			dbSetSpriteAlpha(1, trans);
		}
		else if(trans != 0) {
			trans = (trans < 0) ? 0 : trans - 12;
			dbSetSpriteAlpha(1, trans);
		}
		dbSprite(1, 0, 0, 1);
		dbText(0, 0, dbStr(trans));
		dbSync();
	}
	return;
}

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thm120

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Posted: 16th Jun 2009 19:29

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aw ur the best

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Dark GDK / flashing/repeating object, dbLoopObject doesnt work

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