public void Render(IScreenBuffer screen, PlayerInfo player)
{
screen.Clear();
// The screen has an origin in the top left. Positive Y is DOWN
// Maps have an origin in the bottom left. Positive Y is UP
var screenDimensionsV = screen.Dimensions.ToVector2();
var desiredMapScreenBounds = screenDimensionsV * DefaultMapToScreenRatio;
var gameToScreenFactor = Math.Min(desiredMapScreenBounds.X / _map.Area.X, desiredMapScreenBounds.Y / _map.Area.Y);
var screenAreaInMapCoords = screenDimensionsV / gameToScreenFactor;
var mapCenteringOffset = (screenAreaInMapCoords - _map.Area) / 2 - _map.BottomLeftCorner;
// Transform all vertices
for (int v = 0; v < _map.Vertices.Length; v++)
{
_verticesInScreenCoords[v] = ToScreenCoords(_map.Vertices[v]);
}
Point ToScreenCoords(Vector2 worldCoordinate)
{
var shiftedWorldCoordinate = worldCoordinate + mapCenteringOffset;
// This fixes jittering
var pixelOffset = new Vector2(0.5f, 0.5f);
return(((shiftedWorldCoordinate * gameToScreenFactor) + pixelOffset).ToPoint().InvertY(screen.Height));
}
void DrawLineFromVertices(int v1, int v2, Color c) =>
DrawLineFromScreenCoordinates(_verticesInScreenCoords[v1], _verticesInScreenCoords[v2], c);
void DrawLineFromWorldCoordinates(Vector2 wc1, Vector2 wc2, Color c)
{
var sc1 = ToScreenCoords(wc1);
var sc2 = ToScreenCoords(wc2);
DrawLineFromScreenCoordinates(sc1, sc2, c);
}
void DrawLineFromScreenCoordinates(Point sc1, Point sc2, Color c)
{
var result = LineClipping.ClipToScreen(screen, sc1, sc2);
if (result.shouldDraw)
{
screen.PlotLineSmooth(result.p0, result.p1, c);
}
}
foreach (var lineDef in _map.Map.LineDefs.Take((int)_linesToDraw))
{
ref Vector2 vertex1 = ref _map.Vertices[lineDef.V1];
ref Vector2 vertex2 = ref _map.Vertices[lineDef.V2];
