408 lines
11 KiB
C++
408 lines
11 KiB
C++
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.4
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// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
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//
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// Permission to copy, use, modify, sell and distribute this software
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// is granted provided this copyright notice appears in all copies.
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// This software is provided "as is" without express or implied
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// warranty, and with no claim as to its suitability for any purpose.
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//
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//----------------------------------------------------------------------------
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// Contact: mcseem@antigrain.com
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// mcseemagg@yahoo.com
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// http://www.antigrain.com
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//----------------------------------------------------------------------------
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//
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// classes spline_ctrl_impl, spline_ctrl
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//
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//----------------------------------------------------------------------------
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#include "ctrl/agg_spline_ctrl.h"
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namespace agg
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{
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//------------------------------------------------------------------------
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spline_ctrl_impl::spline_ctrl_impl(double x1, double y1, double x2, double y2,
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unsigned num_pnt, bool flip_y) :
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ctrl(x1, y1, x2, y2, flip_y),
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m_num_pnt(num_pnt),
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m_border_width(1.0),
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m_border_extra(0.0),
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m_curve_width(1.0),
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m_point_size(3.0),
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m_curve_poly(m_curve_pnt),
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m_idx(0),
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m_vertex(0),
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m_active_pnt(-1),
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m_move_pnt(-1),
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m_pdx(0.0),
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m_pdy(0.0)
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{
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if(m_num_pnt < 4) m_num_pnt = 4;
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if(m_num_pnt > 32) m_num_pnt = 32;
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unsigned i;
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for(i = 0; i < m_num_pnt; i++)
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{
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m_xp[i] = double(i) / double(m_num_pnt - 1);
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m_yp[i] = 0.5;
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}
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calc_spline_box();
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update_spline();
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}
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//------------------------------------------------------------------------
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void spline_ctrl_impl::border_width(double t, double extra)
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{
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m_border_width = t;
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m_border_extra = extra;
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calc_spline_box();
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}
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//------------------------------------------------------------------------
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void spline_ctrl_impl::calc_spline_box()
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{
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m_xs1 = m_x1 + m_border_width;
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m_ys1 = m_y1 + m_border_width;
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m_xs2 = m_x2 - m_border_width;
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m_ys2 = m_y2 - m_border_width;
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}
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//------------------------------------------------------------------------
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void spline_ctrl_impl::update_spline()
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{
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int i;
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m_spline.init(m_num_pnt, m_xp, m_yp);
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for(i = 0; i < 256; i++)
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{
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m_spline_values[i] = m_spline.get(double(i) / 255.0);
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if(m_spline_values[i] < 0.0) m_spline_values[i] = 0.0;
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if(m_spline_values[i] > 1.0) m_spline_values[i] = 1.0;
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m_spline_values8[i] = (int8u)(m_spline_values[i] * 255.0);
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}
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}
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//------------------------------------------------------------------------
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void spline_ctrl_impl::calc_curve()
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{
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int i;
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m_curve_pnt.remove_all();
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m_curve_pnt.move_to(m_xs1, m_ys1 + (m_ys2 - m_ys1) * m_spline_values[0]);
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for(i = 1; i < 256; i++)
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{
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m_curve_pnt.line_to(m_xs1 + (m_xs2 - m_xs1) * double(i) / 255.0,
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m_ys1 + (m_ys2 - m_ys1) * m_spline_values[i]);
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}
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}
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//------------------------------------------------------------------------
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double spline_ctrl_impl::calc_xp(unsigned idx)
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{
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return m_xs1 + (m_xs2 - m_xs1) * m_xp[idx];
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}
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//------------------------------------------------------------------------
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double spline_ctrl_impl::calc_yp(unsigned idx)
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{
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return m_ys1 + (m_ys2 - m_ys1) * m_yp[idx];
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}
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//------------------------------------------------------------------------
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void spline_ctrl_impl::set_xp(unsigned idx, double val)
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{
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if(val < 0.0) val = 0.0;
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if(val > 1.0) val = 1.0;
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if(idx == 0)
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{
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val = 0.0;
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}
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else if(idx == m_num_pnt - 1)
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{
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val = 1.0;
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}
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else
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{
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if(val < m_xp[idx - 1] + 0.001) val = m_xp[idx - 1] + 0.001;
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if(val > m_xp[idx + 1] - 0.001) val = m_xp[idx + 1] - 0.001;
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}
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m_xp[idx] = val;
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}
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//------------------------------------------------------------------------
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void spline_ctrl_impl::set_yp(unsigned idx, double val)
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{
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if(val < 0.0) val = 0.0;
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if(val > 1.0) val = 1.0;
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m_yp[idx] = val;
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}
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//------------------------------------------------------------------------
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void spline_ctrl_impl::point(unsigned idx, double x, double y)
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{
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if(idx < m_num_pnt)
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{
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set_xp(idx, x);
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set_yp(idx, y);
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}
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}
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//------------------------------------------------------------------------
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void spline_ctrl_impl::value(unsigned idx, double y)
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{
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if(idx < m_num_pnt)
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{
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set_yp(idx, y);
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}
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}
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//------------------------------------------------------------------------
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double spline_ctrl_impl::value(double x) const
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{
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x = m_spline.get(x);
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if(x < 0.0) x = 0.0;
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if(x > 1.0) x = 1.0;
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return x;
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}
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//------------------------------------------------------------------------
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void spline_ctrl_impl::rewind(unsigned idx)
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{
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unsigned i;
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m_idx = idx;
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switch(idx)
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{
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default:
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case 0: // Background
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m_vertex = 0;
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m_vx[0] = m_x1 - m_border_extra;
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m_vy[0] = m_y1 - m_border_extra;
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m_vx[1] = m_x2 + m_border_extra;
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m_vy[1] = m_y1 - m_border_extra;
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m_vx[2] = m_x2 + m_border_extra;
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m_vy[2] = m_y2 + m_border_extra;
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m_vx[3] = m_x1 - m_border_extra;
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m_vy[3] = m_y2 + m_border_extra;
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break;
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case 1: // Border
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m_vertex = 0;
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m_vx[0] = m_x1;
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m_vy[0] = m_y1;
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m_vx[1] = m_x2;
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m_vy[1] = m_y1;
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m_vx[2] = m_x2;
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m_vy[2] = m_y2;
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m_vx[3] = m_x1;
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m_vy[3] = m_y2;
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m_vx[4] = m_x1 + m_border_width;
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m_vy[4] = m_y1 + m_border_width;
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m_vx[5] = m_x1 + m_border_width;
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m_vy[5] = m_y2 - m_border_width;
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m_vx[6] = m_x2 - m_border_width;
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m_vy[6] = m_y2 - m_border_width;
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m_vx[7] = m_x2 - m_border_width;
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m_vy[7] = m_y1 + m_border_width;
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break;
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case 2: // Curve
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calc_curve();
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m_curve_poly.width(m_curve_width);
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m_curve_poly.rewind(0);
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break;
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case 3: // Inactive points
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m_curve_pnt.remove_all();
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for(i = 0; i < m_num_pnt; i++)
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{
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if(int(i) != m_active_pnt)
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{
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m_ellipse.init(calc_xp(i), calc_yp(i),
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m_point_size, m_point_size, 32);
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m_curve_pnt.concat_path(m_ellipse);
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}
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}
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m_curve_poly.rewind(0);
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break;
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case 4: // Active point
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m_curve_pnt.remove_all();
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if(m_active_pnt >= 0)
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{
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m_ellipse.init(calc_xp(m_active_pnt), calc_yp(m_active_pnt),
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m_point_size, m_point_size, 32);
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m_curve_pnt.concat_path(m_ellipse);
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}
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m_curve_poly.rewind(0);
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break;
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}
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}
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//------------------------------------------------------------------------
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unsigned spline_ctrl_impl::vertex(double* x, double* y)
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{
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unsigned cmd = path_cmd_line_to;
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switch(m_idx)
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{
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case 0:
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if(m_vertex == 0) cmd = path_cmd_move_to;
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if(m_vertex >= 4) cmd = path_cmd_stop;
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*x = m_vx[m_vertex];
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*y = m_vy[m_vertex];
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m_vertex++;
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break;
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case 1:
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if(m_vertex == 0 || m_vertex == 4) cmd = path_cmd_move_to;
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if(m_vertex >= 8) cmd = path_cmd_stop;
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*x = m_vx[m_vertex];
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*y = m_vy[m_vertex];
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m_vertex++;
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break;
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case 2:
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cmd = m_curve_poly.vertex(x, y);
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break;
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case 3:
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case 4:
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cmd = m_curve_pnt.vertex(x, y);
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break;
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default:
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cmd = path_cmd_stop;
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break;
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}
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if(!is_stop(cmd))
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{
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transform_xy(x, y);
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}
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return cmd;
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}
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//------------------------------------------------------------------------
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void spline_ctrl_impl::active_point(int i)
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{
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m_active_pnt = i;
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}
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//------------------------------------------------------------------------
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bool spline_ctrl_impl::in_rect(double x, double y) const
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{
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inverse_transform_xy(&x, &y);
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return x >= m_x1 && x <= m_x2 && y >= m_y1 && y <= m_y2;
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}
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//------------------------------------------------------------------------
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bool spline_ctrl_impl::on_mouse_button_down(double x, double y)
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{
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inverse_transform_xy(&x, &y);
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unsigned i;
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for(i = 0; i < m_num_pnt; i++)
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{
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double xp = calc_xp(i);
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double yp = calc_yp(i);
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if(calc_distance(x, y, xp, yp) <= m_point_size + 1)
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{
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m_pdx = xp - x;
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m_pdy = yp - y;
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m_active_pnt = m_move_pnt = int(i);
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return true;
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}
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}
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return false;
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}
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//------------------------------------------------------------------------
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bool spline_ctrl_impl::on_mouse_button_up(double, double)
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{
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if(m_move_pnt >= 0)
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{
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m_move_pnt = -1;
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return true;
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}
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return false;
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}
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//------------------------------------------------------------------------
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bool spline_ctrl_impl::on_mouse_move(double x, double y, bool button_flag)
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{
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inverse_transform_xy(&x, &y);
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if(!button_flag)
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{
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return on_mouse_button_up(x, y);
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}
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if(m_move_pnt >= 0)
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{
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double xp = x + m_pdx;
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double yp = y + m_pdy;
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set_xp(m_move_pnt, (xp - m_xs1) / (m_xs2 - m_xs1));
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set_yp(m_move_pnt, (yp - m_ys1) / (m_ys2 - m_ys1));
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update_spline();
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return true;
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}
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return false;
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}
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//------------------------------------------------------------------------
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bool spline_ctrl_impl::on_arrow_keys(bool left, bool right, bool down, bool up)
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{
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double kx = 0.0;
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double ky = 0.0;
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bool ret = false;
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if(m_active_pnt >= 0)
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{
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kx = m_xp[m_active_pnt];
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ky = m_yp[m_active_pnt];
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if(left) { kx -= 0.001; ret = true; }
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if(right) { kx += 0.001; ret = true; }
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if(down) { ky -= 0.001; ret = true; }
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if(up) { ky += 0.001; ret = true; }
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}
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if(ret)
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{
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set_xp(m_active_pnt, kx);
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set_yp(m_active_pnt, ky);
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update_spline();
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}
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return ret;
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}
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}
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