/// <summary>
/// Initializes a new instance of the <see cref="Graphics2D"/> class.
/// </summary>
/// <param name="device">The hardware device which is used for rendering.</param>
/// <param name="renderTarget">The render target which is used by this graphics object.</param>
/// <param name="screenSize">The size of the screen in device independent pixels.</param>
internal Graphics2D(EngineDevice device, D2D.RenderTarget renderTarget, Size2F screenSize)
{
m_transformSettings = Graphics2DTransformSettings.Default;
m_transformStack = new Matrix3x2Stack();
m_device = device;
m_renderTarget = renderTarget;
m_screenPixelSize = screenSize;
m_deviceContext = m_renderTarget as D2D.DeviceContext;
}
/// <summary>
/// Sets current transform settings on this graphics object.
/// (be carefull, the state is changed on device level!)
/// </summary>
/// <param name="transformSettings">The settings to be set.</param>
internal void PushTransformSettings(Graphics2DTransformSettings transformSettings)
{
m_transformSettings = transformSettings;
switch (transformSettings.TransformMode)
{
// Overtake given scaling matrix
case Graphics2DTransformMode.Custom:
m_transformStack.Push(transformSettings.CustomTransform);
break;
// Calculate scaling matrix here
case Graphics2DTransformMode.AutoScaleToVirtualScreen:
float virtualWidth = m_transformSettings.VirtualScreenSize.Width;
float virtualHeight = m_transformSettings.VirtualScreenSize.Height;
if (virtualWidth == 0f)
{
virtualWidth = m_screenPixelSize.Width;
}
if (virtualHeight == 0f)
{
virtualHeight = m_screenPixelSize.Height;
}
float scaleFactorX = m_screenPixelSize.Width / virtualWidth;
float scaleFactorY = m_screenPixelSize.Height / virtualHeight;
float combinedScaleFactor = Math.Min(scaleFactorX, scaleFactorY);
float truePixelWidth = virtualWidth * combinedScaleFactor;
float truePixelHeight = virtualHeight * combinedScaleFactor;
m_transformStack.Push();
m_transformStack.TransformLocal(
Matrix3x2.CreateScale(combinedScaleFactor) *
Matrix3x2.CreateTranslation(
m_screenPixelSize.Width / 2f - truePixelWidth / 2f,
m_screenPixelSize.Height / 2f - truePixelHeight / 2f));
break;
default:
throw new SeeingSharpGraphicsException($"Unable to handle transform mode {transformSettings.TransformMode}");
}
// Apply current transform
this.ApplyTransformStack();
}
