Ejemplo n.º 1
0
        /// <summary>
        /// Draws a line between two points using Bresenham's algorithm with a supplied color and thickness
        /// </summary>
        /// <param name="image"></param>
        /// <param name="x1"></param>
        /// <param name="y1"></param>
        /// <param name="x2"></param>
        /// <param name="y2"></param>
        /// <param name="color"></param>
        /// <param name="thickness"></param>
        public static void SetImageBytes(Span <Rgba32> span, int x1, int y1, int x2, int y2, Rgba32 color, int thickness, int width, int height)
        {
            if (thickness == 1)
            {
                XiaolinWuAlgoriithm.DrawLine(span, x1, y1, x2, y2, color, width, height);
            }
            else
            {
                IList <Point> normalPoints = GetLineStartingPoints(x1, y1, x2, y2, thickness);
                for (var i = 0; i < normalPoints.Count(); i++)
                {
                    var point = normalPoints[i];

                    float targetX = x2 + (point.X - x1);
                    float targetY = y2 + (point.Y - y1);

                    //if these are the outer lines, use Xiaolin to anti-aliase them
                    if (i == 0 || i == normalPoints.Count() - 1)
                    {
                        //XiaolinWuAlgoriithm.DrawLine(span, point.X, point.Y, targetX, targetY, color, width, height);
                    }
                    BresenhamLineAlgorithm.DrawLine(span, point.X, point.Y, targetX, targetY, color, width, height);
                }
            }
        }
Ejemplo n.º 2
0
        /// <summary>
        /// Obtains the points of the normals of a line, up to a certain distance from the original line (and starting on x1,y1)
        /// </summary>
        /// <param name="x1"></param>
        /// <param name="y1"></param>
        /// <param name="x2"></param>
        /// <param name="y2"></param>
        /// <param name="thickness"></param>
        /// <returns></returns>
        public static IList <Point> GetLineStartingPoints(int x1, int y1, int x2, int y2, int thickness)
        {
            Vector2 unitVector        = Vector2.Normalize(new Vector2(x2 - x1, y2 - y1));
            Vector2 normalVectorRight = new Vector2(-unitVector.Y, unitVector.X);
            Vector2 normalVectorLeft  = new Vector2(unitVector.Y, -unitVector.X);

            float normalSize = (thickness - 1) / 2f;

            var normalPoints = new List <Point>();

            //Obtain the points of the normals
            Point startingPoint = BresenhamLineAlgorithm.GetNonDiagonalPointsOfLine(x1, y1, normalVectorRight, normalSize).Last();

            normalPoints.Add(startingPoint);

            foreach (Point point in BresenhamLineAlgorithm.GetNonDiagonalPointsOfLine(startingPoint.X, startingPoint.Y, normalVectorLeft, thickness - 1))
            {
                normalPoints.Add(point);
            }

            return(normalPoints);
        }