//---------------------------------------------------------------- public void Begin(double x, double y, int len) { // Calculate transformed coordinates at x1,y1 double xt = x; double yt = y; _trans_dir.Transform(ref xt, ref yt); int x1 = AggMath.iround(xt * SUBPIXEL_SCALE); int y1 = AggMath.iround(yt * SUBPIXEL_SCALE); double dx; double dy; double delta = 1 / (double)SUBPIXEL_SCALE; // Calculate scale by X at x1,y1 dx = xt + delta; dy = yt; _trans_inv.Transform(ref dx, ref dy); dx -= x; dy -= y; int sx1 = (int)AggMath.uround(SUBPIXEL_SCALE / Math.Sqrt(dx * dx + dy * dy)) >> SUBPIXEL_SHIFT; // Calculate scale by Y at x1,y1 dx = xt; dy = yt + delta; _trans_inv.Transform(ref dx, ref dy); dx -= x; dy -= y; int sy1 = (int)AggMath.uround(SUBPIXEL_SCALE / Math.Sqrt(dx * dx + dy * dy)) >> SUBPIXEL_SHIFT; // Calculate transformed coordinates at x2,y2 x += len; xt = x; yt = y; _trans_dir.Transform(ref xt, ref yt); int x2 = AggMath.iround(xt * SUBPIXEL_SCALE); int y2 = AggMath.iround(yt * SUBPIXEL_SCALE); // Calculate scale by X at x2,y2 dx = xt + delta; dy = yt; _trans_inv.Transform(ref dx, ref dy); dx -= x; dy -= y; int sx2 = (int)AggMath.uround(SUBPIXEL_SCALE / Math.Sqrt(dx * dx + dy * dy)) >> SUBPIXEL_SHIFT; // Calculate scale by Y at x2,y2 dx = xt; dy = yt + delta; _trans_inv.Transform(ref dx, ref dy); dx -= x; dy -= y; int sy2 = (int)AggMath.uround(SUBPIXEL_SCALE / Math.Sqrt(dx * dx + dy * dy)) >> SUBPIXEL_SHIFT; // Initialize the interpolators _coord_x = new LineInterpolatorDDA2(x1, x2, len); _coord_y = new LineInterpolatorDDA2(y1, y2, len); _scale_x = new LineInterpolatorDDA2(sx1, sx2, len); _scale_y = new LineInterpolatorDDA2(sy1, sy2, len); }
//-------------------------------------------------------------------- public LineInterpolatorBresenham(int x1, int y1, int x2, int y2) { m_x1_lr = (line_lr(x1)); m_y1_lr = (line_lr(y1)); m_x2_lr = (line_lr(x2)); m_y2_lr = (line_lr(y2)); m_ver = (Math.Abs(m_x2_lr - m_x1_lr) < Math.Abs(m_y2_lr - m_y1_lr)); if (m_ver) { m_len = (int)Math.Abs(m_y2_lr - m_y1_lr); } else { m_len = (int)Math.Abs(m_x2_lr - m_x1_lr); } m_inc = (m_ver ? ((y2 > y1) ? 1 : -1) : ((x2 > x1) ? 1 : -1)); m_interpolator = new LineInterpolatorDDA2(m_ver ? x1 : y1, m_ver ? x2 : y2, (int)m_len); }
//-------------------------------------------------------------------- public LineInterpolatorBresenham(int x1, int y1, int x2, int y2) { _x1_lr = (line_lr(x1)); _y1_lr = (line_lr(y1)); _x2_lr = (line_lr(x2)); _y2_lr = (line_lr(y2)); _ver = (Math.Abs(_x2_lr - _x1_lr) < Math.Abs(_y2_lr - _y1_lr)); if (_ver) { _len = (int)Math.Abs(_y2_lr - _y1_lr); } else { _len = (int)Math.Abs(_x2_lr - _x1_lr); } _inc = (_ver ? ((y2 > y1) ? 1 : -1) : ((x2 > x1) ? 1 : -1)); _interpolator = new LineInterpolatorDDA2(_ver ? x1 : y1, _ver ? x2 : y2, _len); }
//---------------------------------------------------------------- public void ReSync(double xe, double ye, int len) { // Assume x1,y1 are equal to the ones at the previous end point int x1 = m_coord_x.Y; int y1 = m_coord_y.Y; int sx1 = m_scale_x.Y; int sy1 = m_scale_y.Y; // Calculate transformed coordinates at x2,y2 double xt = xe; double yt = ye; m_trans_dir.Transform(ref xt, ref yt); int x2 = AggMath.iround(xt * SUBPIXEL_SCALE); int y2 = AggMath.iround(yt * SUBPIXEL_SCALE); double delta = 1 / (double)SUBPIXEL_SCALE; double dx; double dy; // Calculate scale by X at x2,y2 dx = xt + delta; dy = yt; m_trans_inv.Transform(ref dx, ref dy); dx -= xe; dy -= ye; int sx2 = (int)AggMath.uround(SUBPIXEL_SCALE / Math.Sqrt(dx * dx + dy * dy)) >> SUBPIXEL_SHIFT; // Calculate scale by Y at x2,y2 dx = xt; dy = yt + delta; m_trans_inv.Transform(ref dx, ref dy); dx -= xe; dy -= ye; int sy2 = (int)AggMath.uround(SUBPIXEL_SCALE / Math.Sqrt(dx * dx + dy * dy)) >> SUBPIXEL_SHIFT; // Initialize the interpolators m_coord_x = new LineInterpolatorDDA2(x1, x2, (int)len); m_coord_y = new LineInterpolatorDDA2(y1, y2, (int)len); m_scale_x = new LineInterpolatorDDA2(sx1, sx2, (int)len); m_scale_y = new LineInterpolatorDDA2(sy1, sy2, (int)len); }