/// <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.ID2D1RenderTarget renderTarget, SizeF screenSize)
{
_transformSettings = Graphics2DTransformSettings.Default;
this.TransformStack = new Matrix3x2Stack();
this.Device = device;
_renderTarget = renderTarget;
this.ScreenPixelSize = screenSize;
_deviceContext = (D2D.ID2D1DeviceContext)_renderTarget;
this.Internals = new Graphics2DInternals(this);
}
/// <summary>
/// Sets current transform settings on this graphics object.
/// (be careful, the state is changed on device level!)
/// </summary>
/// <param name="transformSettings">The settings to be set.</param>
internal void PushTransformSettings(Graphics2DTransformSettings transformSettings)
{
_transformSettings = transformSettings;
switch (transformSettings.TransformMode)
{
// Overtake given scaling matrix
case Graphics2DTransformMode.Custom:
this.TransformStack.Push(transformSettings.CustomTransform);
break;
// Calculate scaling matrix here
case Graphics2DTransformMode.AutoScaleToVirtualScreen:
var virtualWidth = _transformSettings.VirtualScreenSize.Width;
var virtualHeight = _transformSettings.VirtualScreenSize.Height;
if (EngineMath.EqualsWithTolerance(virtualWidth, 0f))
{
virtualWidth = this.ScreenPixelSize.Width;
}
if (EngineMath.EqualsWithTolerance(virtualHeight, 0f))
{
virtualHeight = this.ScreenPixelSize.Height;
}
var scaleFactorX = this.ScreenPixelSize.Width / virtualWidth;
var scaleFactorY = this.ScreenPixelSize.Height / virtualHeight;
var combinedScaleFactor = Math.Min(scaleFactorX, scaleFactorY);
var truePixelWidth = virtualWidth * combinedScaleFactor;
var truePixelHeight = virtualHeight * combinedScaleFactor;
this.TransformStack.Push();
this.TransformStack.TransformLocal(
Matrix3x2.CreateScale(combinedScaleFactor) *
Matrix3x2.CreateTranslation(this.ScreenPixelSize.Width / 2f - truePixelWidth / 2f, this.ScreenPixelSize.Height / 2f - truePixelHeight / 2f));
break;
default:
throw new SeeingSharpGraphicsException($"Unable to handle transform mode {transformSettings.TransformMode}");
}
// Apply current transform
this.ApplyTransformStack();
}