I have a problem about spawn of objects every 2 seconds

[jb31313]

//I have a problem about spawn of objects every 2 seconds, in my code, it shows //the sprite by blinking every 2 seconds. can anyone help me with this? i want //it to be spawn the car2 every 2 seconds .

// Beginning Game Programming, 2nd Edition
// Chapter 8
// Tiled_Sprite program source code file

#include "game.h"
#include <time.h>
#include <stdlib.h>
#include <vector>
#include <d3d9.h>
#include "timer.h"

#define car2num 5

LPDIRECT3DTEXTURE9 maincar_image, car2_image;
SPRITE maincar;

SPRITE car2[car2num];
LPDIRECT3DSURFACE9 back, intro;
LPD3DXSPRITE sprite_handler;
LPD3DXSPRITE car2_handler;
 

#pragma comment(lib,"d3d9.lib")
#pragma comment(lib,"d3dx9.lib")

HRESULT result, result2;
void introduction();
void startGame();
void car2start();


bool StartGame;
bool spawn;
//timing variable
long start = GetTickCount();
Timer timer;


//initializes the game
int Game_Init(HWND hwnd)
{
	//set random number seed
	srand(time(NULL));
	int first, second, third,r;
	
	
	
	first = 180;
	second = 355;
	third = 535;
	StartGame = false;
	spawn = false;

    //create sprite handler object
    result = D3DXCreateSprite(d3ddev, &sprite_handler);
    if (result != D3D_OK)
        return 0;

    //load texture with "pink/magenta" as the transparent color
    maincar_image = LoadTexture("maincar.png", D3DCOLOR_XRGB(255,0,255));
    if (maincar_image == NULL)
        return 0;
	

    //load the background image
    intro = LoadSurface("intro.png", NULL);
	if (intro == NULL)
		return 0;
	back = LoadSurface("flatbackground.bmp", NULL);
	if (back == NULL)
		return 0;

    //initialize the sprite's properties
	maincar.x = (SCREEN_WIDTH / 2 - 50 );
	maincar.y = SCREEN_HEIGHT-150;
    maincar.width = 100;  //location in the image file
    maincar.height = 150;  //location in the image file
    maincar.curframe = 0;  
    maincar.lastframe = 1;  //12 
	maincar.animdelay = 3; 
    maincar.animcount = 0; 
    maincar.movex = 3; //change this to any value and see the effect 

	//car2 sprite's properties
	car2_image = LoadTexture("car2.png", D3DCOLOR_XRGB(255,0,255));
		if (car2_image == NULL)
        return 0;
	D3DXCreateSprite(d3ddev, &car2_handler);

	for (int n = 0; n<car2num; n++)

	{		

		srand((unsigned int)time(NULL));
		r = rand() % 3 + 1;
		if (r == 1)
		{
			car2[n].x = first;
		}

		if (r == 2)
		{
			car2[n].x = second;
		}

		if (r == 3)
		{
			car2[n].x = third;
		}


		car2[n].y = 0;
		car2[n].width = 84;  //location in the image file
		car2[n].height = 148;  //location in the image file
		car2[n].curframe = 0;  
		car2[n].lastframe = 1;  //12 
		car2[n].animdelay = 3; 
		car2[n].animcount = 0; 
		car2[n].movey = 1; //change this to any value and see the effect 
	}
   

    //return okay
    return 1;
}

//the main game loop
void Game_Run(HWND hwnd)
{
    //make sure the Direct3D device is valid
    if (d3ddev == NULL)
        return;


        //after short delay, ready for next frame?
        //this keeps the game running at a steady frame rate
        if (GetTickCount() - start >= 30)  //big value slow animation effect
        {
            //reset timing
            start = GetTickCount();




            //has animation delay reached threshold?
            if (++maincar.animcount > maincar.animdelay)
            {
                //reset counter
                maincar.animcount = 0;

                //animate the sprite
               
            }

			
			//start of logics about movement
			

			
			if (spawn == true)
			{
				car2[0].y += 2;
				car2[1].y += 4;
				car2[2].y += 5;
				car2[3].y += 6;
				car2[4].y += 7;
				
			}
			

			//end of logics
       }

        //start rendering
        if (d3ddev->BeginScene())
		{
			introduction();
			if (StartGame == true)
			{
				startGame();
				
				car2start();
				
				
				
			}

			
			
			
					
				

            
            //erase the entire background
          

        //stop rendering
        d3ddev->EndScene();
    }

    //display the back buffer on the screen
    d3ddev->Present(NULL, NULL, NULL, NULL);

    //check for escape key (to exit program)
    if (KEY_DOWN(VK_ESCAPE))
        PostMessage(hwnd, WM_DESTROY, 0, 0);


	if(maincar.x > 150) 
	{
		if(KEY_DOWN(VK_LEFT))
		{
			maincar.x -= maincar.movex;
			
		}
	}

	//Moves the truck to the right
	if(maincar.x < (650 - maincar.width))
	{
		if(KEY_DOWN(VK_RIGHT)) 
		{
			maincar.x += maincar.movex;
			
		}
	}

	





}

//frees memory and cleans up before the game ends
void Game_End(HWND hwnd)
{

    if (maincar_image != NULL)
        maincar_image->Release();

    if (back != NULL)
        back->Release();

	if (intro != NULL)
        intro->Release();

    if (sprite_handler != NULL)
        sprite_handler->Release();

	 if (car2_handler != NULL)
        car2_handler->Release();
}
void introduction()
{

	d3ddev->StretchRect(intro, NULL, backbuffer, NULL, D3DTEXF_NONE);	


	if (KEY_DOWN(VK_SPACE))
	
	{
		StartGame = true;
		
		
	}


	
	
	
	
}

void startGame()
{
	
		
			d3ddev->StretchRect(back, NULL, backbuffer, NULL, D3DTEXF_NONE);	
			//start sprite handler
			

            sprite_handler->Begin(D3DXSPRITE_ALPHABLEND);
            //create vector to update sprite position
	        D3DXVECTOR3 position((float)maincar.x, (float)maincar.y, 0);

            //configure the rect for the source tile
            RECT srcRect;
            int columns = 8;                                                 // next frame 50, 0 and 100 64  
            srcRect.left = (maincar.curframe % columns) * maincar.width;	//left = 1 % 8 * 50 = 50
            srcRect.top = (maincar.curframe / columns) * maincar.height;	//top = 1 / 8 * 64 = 0
            srcRect.right = srcRect.left + maincar.width;					//right = 50 + 50 = 100
	        srcRect.bottom = srcRect.top + maincar.height;					//bottom = 0 + 64

            //draw the sprite maincar
            sprite_handler->Draw(
                maincar_image, 
                &srcRect,
                NULL,
                &position,
                //D3DCOLOR_XRGB(0,0,0));
				D3DCOLOR_ARGB(255, 255, 255, 255)); //you can adjust the alpha coordinate
            
            //stop drawing
            sprite_handler->End();



			
			
			
			

			
}

void car2start()
{
	spawn = true;

	 D3DXVECTOR3 car2position(0,0,0);   //create vector to update sprite position
		

			srand((unsigned int)time(NULL));

			car2_handler->Begin(D3DXSPRITE_ALPHABLEND);

          
	       

            //configure the rect for the source tile

			for (int n = 0; n <car2num; n++)
			{
			RECT car2rect;
            int carcolumn = 8;                                                 // next frame 50, 0 and 100 64  
            car2rect.left = (car2[n].curframe % carcolumn) * car2[n].width;	//left = 1 % 8 * 50 = 50
            car2rect.top = (car2[n].curframe / carcolumn) * car2[n].height;	//top = 1 / 8 * 64 = 0
            car2rect.right = car2rect.left + maincar.width;					//right = 50 + 50 = 100
	        car2rect.bottom = car2rect.top + maincar.height;					//bottom = 0 + 64
			}
            

            

			
				
				timer.run();
					if (timer.seconds % 2 == 1)
					{
				for (int i = 0; i < car2num; i++)

				//draw the sprite
				car2position.x = (float)car2[1].x;
				car2position.y = (float)car2[1].y;		
				car2_handler->Draw(
                car2_image, 
                NULL,
                NULL,
                &car2position,
                //D3DCOLOR_XRGB(0,0,0));
				D3DCOLOR_ARGB(255, 255, 255, 255)); //you can adjust the alpha coordinate
					}
            
			
			//stop drawing
            car2_handler->End();
}

[Gamer2015]

First of all use the [code]-tag to represent code.

I don't know what you mean with "you want to spawn car2 every 2 seonds".

Do you want to have a new car all 2 seconds or do you want to delete the car2 and create a new one each 2 seconds?

[jb31313]

@Gamer2015

i want to have a new car per 2 seconds , i dont want to delete the previous car but instead it will go out of the screen as it downwards.

sorry, first time to use this cplusplus.com :))

[jb31313]

my target interval for spawn of car2 is every 2 seconds.
and in my code, it draws only the car2 every 2 seconds, its like blinking every 2 seconds ;(

help plsss

[Gamer2015]

yup, thats what it does at the moment.

D3DXVECTOR3 car2position(0,0,0);   //create vector to update sprite position
		
srand((unsigned int)time(NULL)); // try to avoid using srand more than once in a programm, put it on the start of the main function

car2_handler->Begin(D3DXSPRITE_ALPHABLEND);

//configure the rect for the source tile

for (int n = 0; n <car2num; n++)
{
    RECT car2rect; // creates car2rect
    int carcolumn = 8;                                                 // next frame 50, 0 and 100 64  
    car2rect.left = (car2[n].curframe % carcolumn) * car2[n].width;	//left = 1 % 8 * 50 = 50
    car2rect.top = (car2[n].curframe / carcolumn) * car2[n].height;	//top = 1 / 8 * 64 = 0
    car2rect.right = car2rect.left + maincar.width;					//right = 50 + 50 = 100
    car2rect.bottom = car2rect.top + maincar.height;					//bottom = 0 + 64
} // car2rect goes out of scope
            
timer.run();
if (timer.seconds % 2 == 1) // i think that means all 2 seconds
{
    for (int i = 0; i < car2num; i++)
    { // added brace here
	    //draw the sprite
            car2position.x = (float)car2[i].x; // changed 1 to i
	    car2position.y = (float)car2[i].y; // changed 1 to i	
	    car2_handler->Draw( /// draw the car2 image on car2position
                car2_image, 
                NULL,
                NULL,
                &car2position,
                //D3DCOLOR_XRGB(0,0,0));
                D3DCOLOR_ARGB(255, 255, 255, 255)); //you can adjust the alpha coordinate
    } // added brace here
}
            
//stop drawing
car2_handler->End();

try again.

It's quite hard to go over your code, but replacing the 1 with i when setting the car positon should do the trick, otherwise you have an other problem^^

[jb31313]

@Gamer2015 I tried that, but still its like blinking. for every 2 seconds, and all of the array of cars[n] which is 5, falls at the same time. What i mean is , all five car2s are showing up in the window and blinks for every 2 seconds omgg -.- i need you man.