//DDA line methods
public static void SetDDALine(Texture2D texture, Vector2 startPoint, Vector2 endPoint, Color color)
{
FloatDeltaValues deltaValues = new FloatDeltaValues(startPoint, endPoint);
if (deltaValues.AbsDeltaX > deltaValues.AbsDeltaY)
{
SetDDALineIncrementingX(texture, startPoint, endPoint, deltaValues, color);
}
else if (deltaValues.AbsDeltaY > 0)
{
SetDDALineIncrementingY(texture, startPoint, endPoint, deltaValues, color);
}
else
{
SetPixel(texture, (int)startPoint.X, (int)startPoint.Y, color);
}
}
private static void SetDSCLineIncrementingY(Texture2D texture, Vector2 startPoint, Vector2 endPoint, FloatDeltaValues deltaValues, Color color)
{
SwapForYDrawingAsNeeded(ref startPoint, ref endPoint, ref deltaValues);
float xInterval = deltaValues.DeltaX / deltaValues.DeltaY;
for (int yMovement = 0; yMovement <= deltaValues.AbsDeltaY; yMovement++)
{
int currentX = (int)Math.Round(startPoint.X + xInterval * yMovement);
int currentY = (int)Math.Round((startPoint.Y) + yMovement);
SetPixel(texture, currentX, currentY, color);
}
}
private static void SwapForYDrawingAsNeeded(ref Vector2 startPoint, ref Vector2 endPoint, ref FloatDeltaValues deltaValues)
{
if (startPoint.Y > endPoint.Y)
{
SwapStartAndEnd(ref startPoint, ref endPoint);
deltaValues = new FloatDeltaValues(startPoint, endPoint);
}
}
private static void SetDDALineIncrementingY(Texture2D texture, Vector2 startPoint, Vector2 endPoint, FloatDeltaValues deltaValues, Color color)
{
SwapForYDrawingAsNeeded(ref startPoint, ref endPoint, ref deltaValues);
Vector2 incrementVector = new Vector2(deltaValues.DeltaX / deltaValues.DeltaY, 1);
for (Vector2 currentPos = startPoint; currentPos.Y <= endPoint.Y; currentPos = Vector2.Add(currentPos, incrementVector))
{
SetPixel(texture, (int)currentPos.X, (int)currentPos.Y, color);
}
}
