用SharpDX绘制二维矩形

Question

如何用SharpDX绘制纯红色的二维矩形？

• 我有一个SharpDX.Direct3D9.从库中获得设备，它为我设置了一个Direct3D v9设备，所以我希望能够使用它？
• 找到关于如何使用Direct2D1绘制基本矩形的教程，但代码似乎依赖于Direct3D11设备，而这一点我还没有--我需要能够在没有Direct3D11和Direct3D10的情况下完成工作 不安全int PresentHook(IntPtr devicePtr，SharpDX.Rectangle* pSourceRect，SharpDX.Rectangle* pDestRect，IntPtr hDestWindowOverride，IntPtr pDirtyRegion) { _isUsingPresent = true；SharpDX.Direct3D9.Device device =(SharpDX.Direct3D9 device)devicePtr；//如何在这里绘制矩形？if (pSourceRect == null == SharpDX.Rectangle.Empty *pSourceRect == SharpDX.Rectangle.Empty) device.Present()；else { if (hDestWindowOverride = IntPtr.Zero) device.Present(*pSourceRect，*pDestRect，hDestWindowOverride)；else device.Present(*pSourceRect，*pDestRect)；}ReportSharpDX.Result.Ok.Code；}

Answer 1

可以使用以下内容绘制雪碧：

// 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();

以这种方式加载纹理将创建一个方形纹理，如果设备功能支持它，那么您可以在加载纹理时指定尺寸。

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

否则，您可以在转换中适当地缩放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;