//-------------------------------------------------------------------- public void MoveTo(int x1, int y1) { m_x1 = x1; m_y1 = y1; if (m_clipping) { m_f1 = ClipLiangBarsky.GetClippingFlags(x1, y1, m_clip_box); } }
//-------------------------------------------------------------------- public void LineTo(AntiAliasedRasterizerCells ras, int x2, int y2) { if (m_clipping) { uint f2 = ClipLiangBarsky.GetClippingFlags(x2, y2, m_clip_box); if ((m_f1 & 10) == (f2 & 10) && (m_f1 & 10) != 0) { // Invisible by Y m_x1 = x2; m_y1 = y2; m_f1 = f2; return; } int x1 = m_x1; int y1 = m_y1; uint f1 = m_f1; int y3, y4; uint f3, f4; switch (((f1 & 5) << 1) | (f2 & 5)) { case 0: // Visible by X line_clip_y(ras, x1, y1, x2, y2, f1, f2); break; case 1: // x2 > Clip.x2 y3 = y1 + MulDiv(m_clip_box.x2 - x1, y2 - y1, x2 - x1); f3 = ClipLiangBarsky.ClippingFlagsY(y3, m_clip_box); line_clip_y(ras, x1, y1, m_clip_box.x2, y3, f1, f3); line_clip_y(ras, m_clip_box.x2, y3, m_clip_box.x2, y2, f3, f2); break; case 2: // x1 > Clip.x2 y3 = y1 + MulDiv(m_clip_box.x2 - x1, y2 - y1, x2 - x1); f3 = ClipLiangBarsky.ClippingFlagsY(y3, m_clip_box); line_clip_y(ras, m_clip_box.x2, y1, m_clip_box.x2, y3, f1, f3); line_clip_y(ras, m_clip_box.x2, y3, x2, y2, f3, f2); break; case 3: // x1 > Clip.x2 && x2 > Clip.x2 line_clip_y(ras, m_clip_box.x2, y1, m_clip_box.x2, y2, f1, f2); break; case 4: // x2 < Clip.x1 y3 = y1 + MulDiv(m_clip_box.x1 - x1, y2 - y1, x2 - x1); f3 = ClipLiangBarsky.ClippingFlagsY(y3, m_clip_box); line_clip_y(ras, x1, y1, m_clip_box.x1, y3, f1, f3); line_clip_y(ras, m_clip_box.x1, y3, m_clip_box.x1, y2, f3, f2); break; case 6: // x1 > Clip.x2 && x2 < Clip.x1 y3 = y1 + MulDiv(m_clip_box.x2 - x1, y2 - y1, x2 - x1); y4 = y1 + MulDiv(m_clip_box.x1 - x1, y2 - y1, x2 - x1); f3 = ClipLiangBarsky.ClippingFlagsY(y3, m_clip_box); f4 = ClipLiangBarsky.ClippingFlagsY(y4, m_clip_box); line_clip_y(ras, m_clip_box.x2, y1, m_clip_box.x2, y3, f1, f3); line_clip_y(ras, m_clip_box.x2, y3, m_clip_box.x1, y4, f3, f4); line_clip_y(ras, m_clip_box.x1, y4, m_clip_box.x1, y2, f4, f2); break; case 8: // x1 < Clip.x1 y3 = y1 + MulDiv(m_clip_box.x1 - x1, y2 - y1, x2 - x1); f3 = ClipLiangBarsky.ClippingFlagsY(y3, m_clip_box); line_clip_y(ras, m_clip_box.x1, y1, m_clip_box.x1, y3, f1, f3); line_clip_y(ras, m_clip_box.x1, y3, x2, y2, f3, f2); break; case 9: // x1 < Clip.x1 && x2 > Clip.x2 y3 = y1 + MulDiv(m_clip_box.x1 - x1, y2 - y1, x2 - x1); y4 = y1 + MulDiv(m_clip_box.x2 - x1, y2 - y1, x2 - x1); f3 = ClipLiangBarsky.ClippingFlagsY(y3, m_clip_box); f4 = ClipLiangBarsky.ClippingFlagsY(y4, m_clip_box); line_clip_y(ras, m_clip_box.x1, y1, m_clip_box.x1, y3, f1, f3); line_clip_y(ras, m_clip_box.x1, y3, m_clip_box.x2, y4, f3, f4); line_clip_y(ras, m_clip_box.x2, y4, m_clip_box.x2, y2, f4, f2); break; case 12: // x1 < Clip.x1 && x2 < Clip.x1 line_clip_y(ras, m_clip_box.x1, y1, m_clip_box.x1, y2, f1, f2); break; } m_f1 = f2; } else { ras.Line(m_x1, m_y1, x2, y2); } m_x1 = x2; m_y1 = y2; }