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+/*
+ * mask_ellipse.cc -- ePiX ellipse crop mask
+ *
+ * This file is part of ePiX, a C++ library for creating high-quality
+ * figures in LaTeX
+ *
+ * Version 1.1.10
+ * Last Change: August 09, 2007
+ */
+
+/*
+ * Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
+ * Andrew D. Hwang <rot 13 nujnat at zngupf dot ubylpebff dot rqh>
+ * Department of Mathematics and Computer Science
+ * College of the Holy Cross
+ * Worcester, MA, 01610-2395, USA
+ */
+
+/*
+ * ePiX is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * ePiX is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with ePiX; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <cmath>
+
+#include "functions.h"
+//#include "errors.h"
+
+#include "constants.h"
+
+#include "pairs.h"
+
+#include "Color.h"
+
+#include "paint_style.h"
+#include "length.h"
+
+#include "pen_line.h"
+#include "pen_fill.h"
+
+#include "edge_data.h"
+#include "screen_crop.h"
+
+#include "screen_mask.h"
+#include "mask_ellipse.h"
+
+namespace ePiX {
+
+ mask_ellipse::mask_ellipse(const pair& arg1, const pair& arg2)
+ : m_hmin(min(arg1.x1(), arg2.x1())),
+ m_hmax(max(arg1.x1(), arg2.x1())),
+ m_vmin(min(arg1.x2(), arg2.x2())),
+ m_vmax(max(arg1.x2(), arg2.x2()))
+ {
+ const double dt(2*M_PI/EPIX_NUM_PTS);
+
+ const pair ctr(0.5*(m_hmin + m_hmax), 0.5*(m_vmin + m_vmax));
+
+ const double hsz(0.5*(m_hmax - m_hmin));
+ const double vsz(0.5*(m_vmax - m_vmin));
+
+ for (unsigned int i=0; i<EPIX_NUM_PTS; ++i)
+ m_border.push_back(edge2d(ctr + pair(hsz*std::cos(i*dt),
+ vsz*std::sin(i*dt)),
+ ctr + pair(hsz*std::cos((i+1)*dt),
+ vsz*std::sin((i+1)*dt)), true));
+ }
+
+ mask_ellipse* mask_ellipse::clone() const
+ {
+ return new mask_ellipse(*this);
+ }
+
+ // corners and midpoints
+ double mask_ellipse::h_min() const { return m_hmin; }
+ double mask_ellipse::v_min() const { return m_vmin; }
+
+ double mask_ellipse::h_max() const { return m_hmax; }
+ double mask_ellipse::v_max() const { return m_vmax; }
+
+ double mask_ellipse::h_avg() const { return 0.5*(m_hmin+m_hmax); }
+ double mask_ellipse::v_avg() const { return 0.5*(m_vmin+m_vmax); }
+
+ double mask_ellipse::h_size() const { return m_hmax - m_hmin; }
+ double mask_ellipse::v_size() const { return m_vmax - m_vmin; }
+
+ // ellipse-specific functions
+ bool mask_ellipse::crops(const pair& arg) const
+ {
+ const double dx((arg.x1() - h_avg())/h_size());
+ const double dy((arg.x2() - v_avg())/v_size());
+ return !(dx*dx + dy*dy <= 0.25);
+ }
+
+ std::list<edge2d>& mask_ellipse::crop_path(std::list<edge2d>& L) const
+ {
+ return crop_path_2nd(m_border, L);
+ }
+
+ std::list<edge2d>& mask_ellipse::crop_loop(std::list<edge2d>& L) const
+ {
+ return crop_loop_2nd(m_border, L);
+ }
+
+ pen_line mask_ellipse::border(const Color& col, const length& len) const
+ {
+ return pen_line(pen_data(col, len), Xfine(), m_border);
+ }
+
+ pen_fill mask_ellipse::backing(const Color& col) const
+ {
+ return pen_fill(col, pen_data(col, PLAIN_WIDTH), 0, m_border);
+ }
+
+ pen_line mask_ellipse::border() const
+ {
+ return pen_line(the_paint_style().line_pen(),
+ the_paint_style().base_pen(), m_border);
+ }
+
+ pen_fill mask_ellipse::backing() const
+ {
+ const Color col(the_paint_style().fill_color());
+ return pen_fill(col, pen_data(col, PLAIN_WIDTH), 0, m_border);
+ }
+} // end of ePiX namespace