用SharpDX繪製2D矩形

Question

如何用SharpDX繪製純紅色的2D矩形？

• 我有一個SharpDX.Direct3D9.Device available from a library爲我設置了一個Direct3D v9設備，所以我希望能夠使用它？

• Found a tutorial on how to use Direct2D1 to draw a basic rectangle，但代碼似乎是依賴於Direct3D11設備，這是我沒有 - 我需要能夠把工作沒有Direct3D11，沒有Direct3D10

  unsafe int PresentHook(IntPtr devicePtr, SharpDX.Rectangle* pSourceRect, SharpDX.Rectangle* pDestRect, IntPtr hDestWindowOverride, IntPtr pDirtyRegion) 
  { 
      _isUsingPresent = true; 
  
      SharpDX.Direct3D9.Device device = (SharpDX.Direct3D9.Device)devicePtr; 
  
      // How to draw rectangle here? 
  
      if (pSourceRect == null || *pSourceRect == SharpDX.Rectangle.Empty) 
       device.Present(); 
      else 
      { 
       if (hDestWindowOverride != IntPtr.Zero) 
        device.Present(*pSourceRect, *pDestRect, hDestWindowOverride); 
       else 
        device.Present(*pSourceRect, *pDestRect); 
      } 
      return SharpDX.Result.Ok.Code; 
  } 
  

Answer 1

完成可以使用類似繪製一個精靈如下：

// Be sure to only initialise these only once (or as needed) 
// not every frame. 

//use relative path 
string dir = System.IO.Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location); 
string filename = dir + @"\image.bmp"; 
var _mytext = SharpDX.Direct3D9.Texture.FromFile(device, filename); 
var _sprite = new SharpDX.Direct3D9.Sprite(device); 

float posLeft = 10f; 
float posTop = 10f; 
var pos = new SharpDX.Vector3(posLeft, posTop, 0); 
var color = new SharpDX.ColorBGRA(0xffffffff); 
_sprite.Begin(SharpDX.Direct3D9.SpriteFlags.AlphaBlend); 
_sprite.Draw(_myText, color, null, null, pos); 
_sprite.End(); 

加載紋理這種方式將創建一個方形紋理，如果設備的功能支持，那麼你可以指定dimensio ns加載紋理時，例如

var _myText = SharpDX.Direct3D9.Texture.FromFile(device, filename, imageSize.Width, imageSize.Height, 0, Usage.None, Format.A8B8G8R8, Pool.Default, Filter.Default, Filter.Default, 0); 

否則，你可以在變換適當縮放X和Y：

// Get image dimensions 
Size imageSize; 
using (var img = Image.FromFile(filename)) 
{ 
    imageSize = img.Size; 
} 
// Calculate scale to get correct image size 
var transform = SharpDX.Matrix.AffineTransformation2D(1f, 0f, Vector2.Zero); 
// Calculate width scale 
if (imageSize.Width <= 128) 
{ 
    transform.M11 = (float)imageSize.Width/128f; // scale x 
} 
else if (imageSize.Width <= 256) 
{ 
    transform.M11 = (float)imageSize.Width/256f; // scale x 
} 
else if (imageSize.Width <= 512) 
{ 
    transform.M11 = (float)imageSize.Width/512f; // scale x 
} 
else if (imageSize.Width <= 1024) 
{ 
    transform.M11 = (float)imageSize.Width/1024f; // scale x 
} 
// Calculate height scale 
if (imageSize.Height <= 128) 
{ 
    transform.M22 = (float)imageSize.Height/128f; // scale y 
} 
else if (imageSize.Height <= 256) 
{ 
    transform.M22 = (float)imageSize.Height/256f; // scale y 
} 
else if (imageSize.Height <= 512) 
{ 
    transform.M22 = (float)imageSize.Height/512f; // scale y 
} 
else if (imageSize.Height <= 1024) 
{ 
    transform.M22 = (float)imageSize.Height/1024f; // scale y 
} 

_sprite.Transform = transform;