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04/12/2009 at 04:48PM PDT, ID: 24316226
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8.2

Trying to animate sprite using DirectX9 and C++

Asked by psycho_blood in DirectX Graphics & Game Programming, Microsoft Visual C++.Net, C++ Programming Language

Tags: directx, sprite, animation

In this program, I create a window and display a cat walking back and forth between the screen using a left and right tileset of bitmaps. Also, I am trying to control two caveman sprites as follows:
- If you press the Right key, cavemanRight.bmp is loaded and the caveman runs to the right.
- If you press the Left key, cavemanLeft.bmp is loaded and the caveman runs to the left.
 
I would like to know why am I only able to display cavemanRight.bmp.
Thanks!
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#include "game.h"
 
LPDIRECT3DTEXTURE9 cat_left_image;
LPDIRECT3DTEXTURE9 cat_right_image;
LPDIRECT3DTEXTURE9 caveman_left_image;
LPDIRECT3DTEXTURE9 caveman_right_image;
 
SPRITE catLeft;
SPRITE catRight;
SPRITE cavemanLeft;
SPRITE cavemanRight;
 
LPDIRECT3DSURFACE9 back;
LPD3DXSPRITE sprite_handler;
 
HRESULT result;
 
//timing variable
long start = GetTickCount();
 
//initializes the game
int Game_Init(HWND hwnd)
{
	//set random number seed
	srand(time_t(NULL));
 
	//create sprite handler object
	result = D3DXCreateSprite(d3ddev, &sprite_handler);
	if (result != D3D_OK)
		return 0;
 
	//load the background image
	back = LoadSurface("background.bmp", NULL);
 
	//load texture with "pink" as the transparent color
	cat_left_image = LoadTexture("catLeft.bmp", D3DCOLOR_XRGB(255,0,255));
	if (cat_left_image == NULL)
		return 0;
	
	// initialize catLeft's properties
	catLeft.x = 96;
	catLeft.y = 150;
	catLeft.width = 96;
	catLeft.height = 96;
	catLeft.curframe = 0;
	catLeft.lastframe = 5;
	catLeft.animdelay = 2;
	catLeft.animcount = 0;
	catLeft.movex = 8;
	catLeft.movey = 0;
	
	//load texture with "pink" as the transparent color
	cat_right_image = LoadTexture("catRight.bmp", D3DCOLOR_XRGB(255,0,255));
	if (cat_right_image == NULL)
		return 0;
 
	// initialize catRight's properties
	catRight.x = 96;
	catRight.y = 150;
	catRight.width = 96;
	catRight.height = 96;
	catRight.curframe = 0;
	catRight.lastframe = 5;
	catRight.animdelay = 2;
	catRight.animcount = 0;
	catRight.movex = 8;
	catRight.movey = 0;
 
	//load texture with "pink" as the transparent color
	caveman_left_image = LoadTexture("cavemanLeft.bmp", D3DCOLOR_XRGB(255,0,255));
	if (caveman_left_image == NULL)
		return 0;
 
	//initialize cavemanLeft's properties
	cavemanLeft.x = 100;
	cavemanLeft.y = 180;
	cavemanLeft.width = 50;
	cavemanLeft.height = 64;
	cavemanLeft.curframe = 1;
	cavemanLeft.lastframe = 11;
	cavemanLeft.animdelay = 3;
	cavemanLeft.animcount = 0;
	cavemanLeft.movex = 5;
	cavemanLeft.movey = 0;
 
	//load texture with "pink" as the transparent color
	caveman_right_image = LoadTexture("cavemanRight.bmp", D3DCOLOR_XRGB(255,0,255));
	if (caveman_right_image == NULL)
		return 0;
 
	//initialize cavemanLeft's properties
	cavemanRight.x = 100;
	cavemanRight.y = 180;
	cavemanRight.width = 50;
	cavemanRight.height = 64;
	cavemanRight.curframe = 1;
	cavemanRight.lastframe = 11;
	cavemanRight.animdelay = 3;
	cavemanRight.animcount = 0;
	cavemanRight.movex = 5;
	cavemanRight.movey = 0;
 
	//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)
	{
		//reset timing
		start = GetTickCount();
 
		//move cat to the left
		catLeft.x += catLeft.movex;
		catLeft.y += catLeft.movey;
 
		//"warp" the sprite at screen edges
		if (catLeft.x > SCREEN_WIDTH - catLeft.width)
			catLeft.movex *= -1;
		else if (catLeft.x < 0)
		{
			catLeft.movex *= -1;
			catLeft.x += catLeft.movex;
		}
		
		//move cat to the right
		catRight.x += catRight.movex;
		catRight.y += catRight.movey;
 
		//"warp" the sprite at screen edges
		if (catRight.x > SCREEN_WIDTH - catRight.width)
			catRight.movex *= -1;
		else if (catRight.x < 0)
		{
			catRight.movex *= -1;
			catRight.x += catRight.movex;
		}
 
		//move caveman to the right
		if (KEY_DOWN(VK_RIGHT))
		{
			cavemanRight.x += cavemanRight.movex;
			cavemanRight.y += cavemanRight.movey;
		}
 
		//move caveman to the left
		if (KEY_DOWN(VK_LEFT))
		{
			cavemanRight.x -= cavemanRight.movex;
			cavemanRight.y -= cavemanRight.movey;
		}
 
		//"warp" the sprite at screen edges
		if (cavemanRight.x > SCREEN_WIDTH - cavemanRight.width)
		{
			cavemanRight.x = SCREEN_WIDTH - cavemanRight.width;
		}
		else if (cavemanRight.x < 0)
		{
			cavemanRight.x = 0;
		}
 
		//has animation delay reached threshold?
		if (++cavemanRight.animcount > cavemanRight.animdelay)
		{
			//reset counter
			cavemanRight.animcount = 0;
 
			//animate the sprite
			if (++cavemanRight.curframe > cavemanRight.lastframe)
				cavemanRight.curframe = 1;
		}
		
		if (++cavemanLeft.animcount > cavemanLeft.animdelay)
		{
			//reset counter
			cavemanLeft.animcount = 0;
 
			//animate the sprite
			if (++cavemanLeft.curframe > cavemanLeft.lastframe)
				cavemanLeft.curframe = 1;
		}
 
		if (++catRight.animcount > catRight.animdelay)
		{
			//reset counter
			catRight.animcount = 0;
 
			//animate the sprite
			if (++catRight.curframe > catRight.lastframe)
				catRight.curframe = 1;
		}
 
		if (++catLeft.animcount > catLeft.animdelay)
		{
			//reset counter
			catLeft.animcount = 0;
 
			//animate the sprite
			if (++catLeft.curframe > catLeft.lastframe)
				catLeft.curframe = 1;
		}
	}
 
	//start rendering
	if (d3ddev->BeginScene())
	{
		//erase the entire background
		d3ddev->StretchRect(back, NULL, backbuffer, NULL, D3DTEXF_NONE);
 
		//start sprite handler
		sprite_handler->Begin(D3DXSPRITE_ALPHABLEND);
 
		//create vector to update caveman position
		D3DXVECTOR3 cavemanRightPosition((float)cavemanRight.x, (float)cavemanRight.y, 0);
		D3DXVECTOR3 cavemanLeftPosition((float)cavemanLeft.x, (float)cavemanLeft.y, 0);
		D3DXVECTOR3 catRightPosition ((float)catRight.x, (float)catRight.y, 0);
		D3DXVECTOR3 catLeftPosition ((float)catLeft.x, (float)catLeft.y, 0);
 
		//configure the rect for the source tile
		RECT catSrcRect;
		RECT cavemanLeftSrcRect;
		RECT cavemanRightSrcRect;
 
		int catColumns = 6;
		int cavemanColumns = 8; 
 
		catSrcRect.left = (catLeft.curframe % catColumns) * catLeft.width;
		catSrcRect.top = (catLeft.curframe / catColumns) * catLeft.height;
		catSrcRect.right = catSrcRect.left + catLeft.width;
		catSrcRect.bottom = catSrcRect.top + catLeft.height;
 
		cavemanLeftSrcRect.left = (cavemanLeft.curframe % cavemanColumns) * cavemanLeft.width;
		cavemanLeftSrcRect.top = (cavemanLeft.curframe / cavemanColumns) * cavemanLeft.height;
		cavemanLeftSrcRect.right = cavemanLeftSrcRect.left + cavemanLeft.width;
		cavemanLeftSrcRect.bottom = cavemanLeftSrcRect.top + cavemanLeft.height;
 
		cavemanRightSrcRect.left = (cavemanRight.curframe % cavemanColumns) * cavemanRight.width;
		cavemanRightSrcRect.top = (cavemanRight.curframe / cavemanColumns) * cavemanRight.height;
		cavemanRightSrcRect.right = cavemanRightSrcRect.left + cavemanRight.width;
		cavemanRightSrcRect.bottom = cavemanRightSrcRect.top + cavemanRight.height;
 
		//draw the sprite
		if (cavemanRight.movex > 0)
		{
			sprite_handler->Draw(
				caveman_right_image,
				&cavemanRightSrcRect,
				NULL,
				&cavemanRightPosition,
				D3DCOLOR_XRGB(255,255,255));
		}
		else if (cavemanRight.movex < 0)
		{
			sprite_handler->Draw(
				caveman_left_image,
				&cavemanLeftSrcRect,
				NULL,
				&cavemanLeftPosition,
				D3DCOLOR_XRGB(255,255,255));
		}
 
		if (catLeft.movex > 0)
		{
			sprite_handler->Draw(
				cat_right_image,
				&catSrcRect,
				NULL,
				&catRightPosition,
				D3DCOLOR_XRGB(255,255,255));
		}
		else if (catLeft.movex < 0)
		{
			sprite_handler->Draw(
				cat_left_image,
				&catSrcRect,
				NULL,
				&catLeftPosition,
				D3DCOLOR_XRGB(255,255,255));
		}
 
		//stop drawing
		sprite_handler->End();
 
		//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);
}
 
//frees memory and cleans up before the game ends
void Game_End(HWND hwnd)
{
 
	if (caveman_left_image != NULL)
		caveman_left_image->Release();
 
	if (caveman_right_image != NULL)
		caveman_right_image->Release();
 
	if (cat_left_image != NULL)
		cat_left_image->Release();
 
	if (cat_right_image != NULL)
		cat_right_image->Release();
 
	if (back != NULL)
		back->Release();
 
	if (sprite_handler != NULL)
		sprite_handler->Release();
 
}
Attachments:
 
background.bmp (900 KB) (File Type Details) 
Background bitmap
Background bitmap
 
 
catLeft.bmp (165 KB) (File Type Details) 
catLeft bitmap
catLeft bitmap
 
 
catRight.bmp (165 KB) (File Type Details) 
catRight bitmap
catRight bitmap
 
 
cavemanLeft.bmp (185 KB) (File Type Details) 
cavemanLeft bitmap
cavemanLeft bitmap
 
 
cavemanRight.bmp (185 KB) (File Type Details) 
cavemanRight bitmap
cavemanRight bitmap
 
[+][-]04/12/09 11:13 PM, ID: 24128171

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[+][-]04/14/09 09:56 PM, ID: 24144794

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[+][-]04/14/09 10:28 PM, ID: 24144906

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[+][-]05/04/09 08:56 PM, ID: 24301449

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About this solution

Zones: DirectX Graphics & Game Programming, Microsoft Visual C++.Net, C++ Programming Language
Tags: directx, sprite, animation
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Solution Provided By: psycho_blood
Participating Experts: 1
Solution Grade: A
 
 
 
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