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-rwxr-xr-xagg/inc/agg_trans_bilinear.h166
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diff --git a/agg/inc/agg_trans_bilinear.h b/agg/inc/agg_trans_bilinear.h
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-//----------------------------------------------------------------------------
-// Anti-Grain Geometry - Version 2.3
-// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
-//
-// Permission to copy, use, modify, sell and distribute this software
-// is granted provided this copyright notice appears in all copies.
-// This software is provided "as is" without express or implied
-// warranty, and with no claim as to its suitability for any purpose.
-//
-//----------------------------------------------------------------------------
-// Contact: mcseem@antigrain.com
-// mcseemagg@yahoo.com
-// http://www.antigrain.com
-//----------------------------------------------------------------------------
-//
-// Bilinear 2D transformations
-//
-//----------------------------------------------------------------------------
-#ifndef AGG_TRANS_BILINEAR_INCLUDED
-#define AGG_TRANS_BILINEAR_INCLUDED
-
-#include "agg_basics.h"
-#include "agg_simul_eq.h"
-
-namespace agg
-{
-
- //==========================================================trans_bilinear
- class trans_bilinear
- {
- public:
- //--------------------------------------------------------------------
- trans_bilinear() : m_valid(false) {}
-
- //--------------------------------------------------------------------
- // Arbitrary quadrangle transformations
- trans_bilinear(const double* src, const double* dst)
- {
- quad_to_quad(src, dst);
- }
-
-
- //--------------------------------------------------------------------
- // Direct transformations
- trans_bilinear(double x1, double y1, double x2, double y2,
- const double* quad)
- {
- rect_to_quad(x1, y1, x2, y2, quad);
- }
-
-
- //--------------------------------------------------------------------
- // Reverse transformations
- trans_bilinear(const double* quad,
- double x1, double y1, double x2, double y2)
- {
- quad_to_rect(quad, x1, y1, x2, y2);
- }
-
-
- //--------------------------------------------------------------------
- // Set the transformations using two arbitrary quadrangles.
- void quad_to_quad(const double* src, const double* dst)
- {
- double left[4][4];
- double right[4][2];
-
- unsigned i;
- for(i = 0; i < 4; i++)
- {
- unsigned ix = i * 2;
- unsigned iy = ix + 1;
- left[i][0] = 1.0;
- left[i][1] = src[ix] * src[iy];
- left[i][2] = src[ix];
- left[i][3] = src[iy];
-
- right[i][0] = dst[ix];
- right[i][1] = dst[iy];
- }
- m_valid = simul_eq<4, 2>::solve(left, right, m_mtx);
- }
-
-
- //--------------------------------------------------------------------
- // Set the direct transformations, i.e., rectangle -> quadrangle
- void rect_to_quad(double x1, double y1, double x2, double y2,
- const double* quad)
- {
- double src[8];
- src[0] = src[6] = x1;
- src[2] = src[4] = x2;
- src[1] = src[3] = y1;
- src[5] = src[7] = y2;
- quad_to_quad(src, quad);
- }
-
-
- //--------------------------------------------------------------------
- // Set the reverse transformations, i.e., quadrangle -> rectangle
- void quad_to_rect(const double* quad,
- double x1, double y1, double x2, double y2)
- {
- double dst[8];
- dst[0] = dst[6] = x1;
- dst[2] = dst[4] = x2;
- dst[1] = dst[3] = y1;
- dst[5] = dst[7] = y2;
- quad_to_quad(quad, dst);
- }
-
- //--------------------------------------------------------------------
- // Check if the equations were solved successfully
- bool is_valid() const { return m_valid; }
-
- //--------------------------------------------------------------------
- // Transform a point (x, y)
- void transform(double* x, double* y) const
- {
- double tx = *x;
- double ty = *y;
- double xy = tx * ty;
- *x = m_mtx[0][0] + m_mtx[1][0] * xy + m_mtx[2][0] * tx + m_mtx[3][0] * ty;
- *y = m_mtx[0][1] + m_mtx[1][1] * xy + m_mtx[2][1] * tx + m_mtx[3][1] * ty;
- }
-
-
- //--------------------------------------------------------------------
- class iterator_x
- {
- double inc_x;
- double inc_y;
-
- public:
- double x;
- double y;
-
- iterator_x() {}
- iterator_x(double tx, double ty, double step, const double m[4][2]) :
- inc_x(m[1][0] * step * ty + m[2][0] * step),
- inc_y(m[1][1] * step * ty + m[2][1] * step),
- x(m[0][0] + m[1][0] * tx * ty + m[2][0] * tx + m[3][0] * ty),
- y(m[0][1] + m[1][1] * tx * ty + m[2][1] * tx + m[3][1] * ty)
- {
- }
-
- void operator ++ ()
- {
- x += inc_x;
- y += inc_y;
- }
- };
-
- iterator_x begin(double x, double y, double step) const
- {
- return iterator_x(x, y, step, m_mtx);
- }
-
- private:
- double m_mtx[4][2];
- bool m_valid;
- };
-
-}
-
-#endif