Direct3D sprite not appearing on the screen

This is a discussion on Direct3D sprite not appearing on the screen within the Game Programming forums, part of the General Programming Boards category; I'm trying to make a game using DirectX 10, and I started by making a sprite for the health bar. ...

  1. #1
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    Direct3D sprite not appearing on the screen

    I'm trying to make a game using DirectX 10, and I started by making a sprite for the health bar. The problem is the health bar isn't being drawn on the screen. Here is the relevant code.

    Code:
    //Creating the health bar
    g_pHealthBar = new BimanBitmap(TEXT("Res//Bar.bmp"), g_pGame->GetDevice(), 10, 50);
    g_pHealthBar->SetPosition(320, 240);
    Code:
    //The BimanBitmap functions
    #include "BimanBitmap.h"
    
    void BimanBitmap::Draw(ID3DX10Sprite* pSprite)
    {
    	HRESULT hr = pSprite->DrawSpritesImmediate(&m_dsSprite,1, 0, 0); 
    	if(FAILED(hr))
    		MessageBox(NULL, TEXT("Could not draw sprite"), TEXT("Error!"), MB_OK);
    }
    
    void BimanBitmap::SetPosition(int x, int y)
    {
    	m_ptPos.x = x;
    	m_ptPos.y = y;
    }
    
    void BimanBitmap::SetVelocity(int x, int y)
    {
    	m_ptVel.x = x;
    	m_ptVel.y = y;
    }
    
    void BimanBitmap::SetSize(float x, float y)
    {
    	D3DXMatrixScaling(&m_mxScaling, x, y, 0.1f);
    
    	m_dsSprite.matWorld = (m_mxScaling * m_mxTranslation);
    }
    
    BimanBitmap::BimanBitmap(LPCWSTR szFileName, ID3D10Device* pDevice, int iWidth, int iHeight)
    {
    	m_ptPos.x = m_ptPos.x = 0;
    	m_ptVel.x = m_ptVel.y = 0;
    	m_iWidth  = iWidth;
    	m_iHeight = iHeight;
    	//Create the image
    	CreateImage(szFileName, pDevice);
    
    	//This sets the original position of the sprite
    	D3DXMatrixTranslation(&m_mxTranslation, 0, 0, 0.1f);
    	//This sets the size of the sprite
    	D3DXMatrixScaling(&m_mxScaling, (float)m_iWidth, (float)m_iHeight, 0.1f);
    
    	m_dsSprite.matWorld = (m_mxScaling * m_mxTranslation);
    }
    
    BimanBitmap::~BimanBitmap()
    {
    }
    
    void BimanBitmap::Update()
    {
    	m_ptPos.x += m_ptVel.x;
    	m_ptPos.y += m_ptVel.y;
    
    	//Update the position of the sprite
    	D3DXMatrixTranslation(&m_mxTranslation, (float)m_ptPos.x, (float)(480 - m_ptPos.y), 0.1f);
    
    	m_dsSprite.matWorld = (m_mxScaling * m_mxTranslation);
    }
    
    void BimanBitmap::CreateImage(LPCWSTR szFileName, ID3D10Device* pDevice)
    {
    	ID3D10ShaderResourceView* pResourceView;
    
    	HRESULT hr = D3DX10CreateShaderResourceViewFromFile(pDevice, szFileName, NULL, NULL, &pResourceView, NULL);
    
    	if(FAILED(hr))
    	{
    		LPWSTR string;
    		wsprintf(string, TEXT("%s was not found"), szFileName);
    		MessageBox(NULL, string, TEXT("ERROR"), MB_OK);
    	}
    
    	m_dsSprite.pTexture = pResourceView;
    	m_dsSprite.TexCoord.x = 0;
    	m_dsSprite.TexCoord.y = 0;
    	m_dsSprite.TexSize.x = 1.0f;
    	m_dsSprite.TexSize.y = 1.0f;
    	m_dsSprite.TextureIndex = 0;
    	m_dsSprite.ColorModulate = D3DXCOLOR(1.0f, 1.0f, 1.0f, 1.0f);
    }
    Code:
    //The Creating the sprite object
    //Create the sprite object
    hr = D3DX10CreateSprite(m_pD3DDevice, 0, &m_pSprite);
    	
    //Create the projection transform
    D3DXMATRIX matProjection;
    D3DXMatrixOrthoOffCenterLH(&matProjection, (float)viewPort.TopLeftX, (float)viewPort.Width, (float)viewPort.TopLeftY, (float)viewPort.Height,
    	0.1f, 10);
    
    hr = m_pSprite->SetProjectionTransform(&matProjection);
    Code:
    //the render function
    void BimanEngine::Render()
    {
    	m_pD3DDevice->ClearRenderTargetView(m_pRenderTargetView, D3DXCOLOR(0.02f, 0.04f, 0.2f, 0.0f));
    
    	m_pFontSprite->Begin(D3DX10_SPRITE_SORT_TEXTURE);
    	HRESULT hr = m_pSprite->Begin(D3DX10_SPRITE_SORT_TEXTURE);
    
    	GamePaint();
    
    	m_pSprite->End();
    	m_pFontSprite->End();
    
    	m_pSwapChain->Present(0, 0);
    }
    Code:
    //the game paint function
    void GamePaint()
    {
    	g_pHealthBar->Draw(g_pGame->GetSprite());
    }
    Thank you
    Last edited by bijan311; 12-26-2011 at 12:35 PM.

  2. #2
    Super Moderator VirtualAce's Avatar
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    I have no idea why it is not drawing but I should mention I would not rely on the D3DX10 sprite interface implementation. It had a serious memory leak in DirectX 9 and I doubt they have fixed it.

    Your ortho matrix appears to have bottom and top flipped. Is this on purpose?
    Last edited by VirtualAce; 12-26-2011 at 07:37 PM.

  3. #3
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    Quote Originally Posted by VirtualAce View Post
    Your ortho matrix appears to have bottom and top flipped. Is this on purpose?
    What do you mean? I double checked the example in my book and it looked right.

  4. #4
    Super Moderator VirtualAce's Avatar
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    As it appears in the SDK:
    D3DXMATRIX * D3DXMatrixOrthoOffCenterLH( D3DXMATRIX *pOut, FLOAT l, FLOAT r,
    FLOAT b, FLOAT t, FLOAT zn, FLOAT zf);
    As it appears in your code:
    Code:
    D3DXMatrixOrthoOffCenterLH(&matProjection, (float)viewPort.TopLeftX, (float)viewPort.Width, (float)viewPort.TopLeftY, (float)viewPort.Height,    0.1f, 10);
    You use viewPort.TopLeftY in place of b or bottom and viewPort.Height in place of t or Top. Hence it is flipped.

    In 2D positive Y is down the screen since the origin is at the top, left. In 3D left-handed coordinate systems positive Y is up and the origin is at the center of the screen. The origin in screen space that is - the origin of the world is still at 0,0,0 or at the camera position when it is moved.

  5. #5
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    Oops, I guess that was a mistake, but it still didn't solve my problem.

  6. #6
    Just a pushpin. bernt's Avatar
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    Res//Bar.bmp
    I believe you meant "Res\\Bar.bmp" (with '\' backslashes).
    "Res/Bar.bmp" (with a single '/' slash) should also work.
    Consider this post signed

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