private IEnumerable <RenderTargetBitmap> ProduceAnimationFrames(Animation animation, int firstFrame, int lastFrame)
{
if (_document == null)
{
throw new Exception("Call PrepareDocument() first");
}
var bounds = GetAnimationWorldBounds(animation, _document);
var cameraCenter = new Vector(bounds.X + bounds.Width * 0.5, bounds.Y + bounds.Height * 0.5);
var scale = GetCoercedScale();
var width = 500; //(int)Math.Ceiling(bounds.Width * scale);
var height = 500; //(int) Math.Ceiling(bounds.Height * scale);
ConfigureViewport(width, height);
for (var i = firstFrame; i <= lastFrame; i++)
{
_document.ApplyAnimationToScene(animation.Id, i);
SceneViewport.Clear();
SceneViewport.PanTo(cameraCenter);
SceneViewport.SetZoom(scale);
AddSpritesToViewport(_document);
var renderTarget = new RenderTargetBitmap(width, height, 144, 144, PixelFormats.Default);
renderTarget.Render(SceneViewport);
yield return(renderTarget);
SavePng(renderTarget, $"{animation.Name}_{i:000}.png");
}
}
public void PanTo(Vector worldDistance)
{
SceneViewport.PanTo(worldDistance);
UpdateAllGizmoTransforms();
}