public void Render(ICanvas canvas, int width, int height, IPixelMapper pixelMapper)
{
if (pixelMapper.CellSize != _lastCellSize)
{
_imageCache.Clear();
_lastCellSize = pixelMapper.CellSize;
}
foreach (T entity in _layout)
{
var renderer = _renderers.FirstOrDefault(r => r.ShouldRender(entity));
if (renderer is null)
{
// TODO: Fill with Red to indicate error?
continue;
}
(int x, int y, bool onScreen) = pixelMapper.CoordsToViewPortPixels(entity.Column, entity.Row);
if (!onScreen)
{
continue;
}
string key = $"{entity.GetType().Name}.{entity.Identifier}";
if (_imageCache.IsDirty(key))
{
using IImageCanvas imageCanvas = _imageFactory.CreateImageCanvas(pixelMapper.CellSize, pixelMapper.CellSize);
float scale = pixelMapper.CellSize / 100.0f;
imageCanvas.Canvas.Scale(scale, scale);
renderer.Render(imageCanvas.Canvas, entity);
_imageCache.Set(key, imageCanvas.Render());
}
using (canvas.Scope())
{
canvas.Translate(x, y);
canvas.ClipRect(new Rectangle(0, 0, pixelMapper.CellSize, pixelMapper.CellSize), false, false);
canvas.DrawImage(_imageCache.Get(key) !, 0, 0);
}
}
}
public void SetSize(int width, int height)
{
_screenWidth = width;
_screenHeight = height;
_imageCache.SetDirtyAll(_screens);
(int columns, int rows) = _pixelMapper.ViewPortPixelsToCoords(width, height);
columns = Math.Max(columns, 1);
rows = Math.Max(rows, 1);
(width, height, _) = _pixelMapper.CoordsToViewPortPixels(columns + 1, rows + 1);
if (_width != width || _height != height)
{
_width = width;
_height = height;
_pixelMapper.SetViewPortSize(_width, _height);
// strictly speaking this only needs to clear renderers, but we already cleared screens
// so its easier just to call clear
_imageCache.Clear();
}
}
