//Bresenham lines
public static void SetBHLine(Texture2D texture, Point startPoint, Point endPoint, Color color)
{
IntDeltaValues deltaValues = new IntDeltaValues(startPoint, endPoint);
if (deltaValues.AbsDeltaX > deltaValues.AbsDeltaY)
{
SetBHLineIncrementingX(texture, startPoint, endPoint, deltaValues, color);
}
else if (deltaValues.AbsDeltaY > 0)
{
SetBHLineIncrementingY(texture, startPoint, endPoint, deltaValues, color);
}
else
{
SetPixel(texture, (int)startPoint.X, (int)startPoint.Y, color);
}
}
private static void SwapForYDrawingAsNeeded(ref Point startPoint, ref Point endPoint, ref IntDeltaValues deltaValues)
{
if (startPoint.Y > endPoint.Y)
{
SwapStartAndEnd(ref startPoint, ref endPoint);
deltaValues = new IntDeltaValues(startPoint, endPoint);
}
}
private static void SetBHLineIncrementingY(Texture2D texture, Point startPoint, Point endPoint, IntDeltaValues deltaValues, Color color)
{
SwapForYDrawingAsNeeded(ref startPoint, ref endPoint, ref deltaValues);
int slope = 0;
int incE = 0;
int incNE = 0;
int d = 0;
SetBHStartValues(deltaValues.AbsDeltaY, deltaValues.DeltaX, deltaValues.AbsDeltaX, ref slope, ref incE, ref incNE, ref d);
for (Point currentPos = startPoint; currentPos.Y <= endPoint.Y; currentPos.Y++)
{
SetPixel(texture, (int)currentPos.X, (int)currentPos.Y, color);
if (d <= 0)
{
d += incE;
}
else
{
d += incNE;
currentPos.X += slope;
}
}
}
