305 lines
11 KiB
C++
Executable File
305 lines
11 KiB
C++
Executable File
//----------------------------------------------------------------------------
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// Anti-Grain Geometry - Version 2.2
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// Copyright (C) 2002-2004 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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// Viewport transformer - simple orthogonal conversions from world coordinates
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// to screen (device) ones.
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//
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//----------------------------------------------------------------------------
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#ifndef AGG_TRANS_VIEWPORT_INCLUDED
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#define AGG_TRANS_VIEWPORT_INCLUDED
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#include <string.h>
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#include "agg_basics.h"
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namespace agg
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{
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enum aspect_ratio_e
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{
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aspect_ratio_stretch,
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aspect_ratio_meet,
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aspect_ratio_slice
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};
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//----------------------------------------------------------trans_viewport
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class trans_viewport
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{
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public:
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//-------------------------------------------------------------------
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trans_viewport() :
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m_world_x1(0.0),
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m_world_y1(0.0),
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m_world_x2(1.0),
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m_world_y2(1.0),
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m_device_x1(0.0),
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m_device_y1(0.0),
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m_device_x2(1.0),
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m_device_y2(1.0),
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m_aspect(aspect_ratio_stretch),
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m_align_x(0.5),
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m_align_y(0.5),
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m_wx1(0.0),
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m_wy1(0.0),
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m_wx2(1.0),
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m_wy2(1.0),
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m_dx1(0.0),
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m_dy1(0.0),
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m_kx(1.0),
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m_ky(1.0)
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{}
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//-------------------------------------------------------------------
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void preserve_aspect_ratio(double alignx,
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double aligny,
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aspect_ratio_e aspect)
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{
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m_align_x = alignx;
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m_align_y = aligny;
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m_aspect = aspect;
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update();
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}
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//-------------------------------------------------------------------
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void device_viewport(double x1, double y1, double x2, double y2)
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{
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m_device_x1 = x1;
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m_device_y1 = y1;
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m_device_x2 = x2;
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m_device_y2 = y2;
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update();
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}
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//-------------------------------------------------------------------
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void world_viewport(double x1, double y1, double x2, double y2)
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{
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m_world_x1 = x1;
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m_world_y1 = y1;
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m_world_x2 = x2;
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m_world_y2 = y2;
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update();
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}
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//-------------------------------------------------------------------
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void device_viewport(double* x1, double* y1, double* x2, double* y2) const
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{
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*x1 = m_device_x1;
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*y1 = m_device_y1;
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*x2 = m_device_x2;
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*y2 = m_device_y2;
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}
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//-------------------------------------------------------------------
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void world_viewport(double* x1, double* y1, double* x2, double* y2) const
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{
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*x1 = m_world_x1;
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*y1 = m_world_y1;
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*x2 = m_world_x2;
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*y2 = m_world_y2;
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}
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//-------------------------------------------------------------------
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void world_viewport_actual(double* x1, double* y1,
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double* x2, double* y2) const
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{
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*x1 = m_wx1;
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*y1 = m_wy1;
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*x2 = m_wx2;
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*y2 = m_wy2;
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}
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//-------------------------------------------------------------------
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double align_x() const { return m_align_x; }
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double align_y() const { return m_align_y; }
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aspect_ratio_e aspect_ratio() const { return m_aspect; }
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//-------------------------------------------------------------------
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void transform(double* x, double* y) const
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{
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*x = (*x - m_wx1) * m_kx + m_dx1;
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*y = (*y - m_wy1) * m_ky + m_dy1;
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}
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//-------------------------------------------------------------------
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void inverse_transform(double* x, double* y) const
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{
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*x = (*x - m_dx1) / m_kx + m_wx1;
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*y = (*y - m_dy1) / m_ky + m_wy1;
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}
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//-------------------------------------------------------------------
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double scale_x() const
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{
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return m_kx;
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}
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//-------------------------------------------------------------------
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double scale_y() const
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{
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return m_ky;
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}
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//-------------------------------------------------------------------
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double scale() const
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{
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return (m_kx + m_ky) * 0.5;
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}
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//-------------------------------------------------------------------
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unsigned byte_size() const
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{
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return
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sizeof(m_world_x1) +
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sizeof(m_world_y1) +
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sizeof(m_world_x2) +
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sizeof(m_world_y2) +
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sizeof(m_device_x1) +
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sizeof(m_device_y1) +
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sizeof(m_device_x2) +
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sizeof(m_device_y2) +
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sizeof(m_aspect) +
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sizeof(m_align_x) +
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sizeof(m_align_y) +
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sizeof(m_wx1) +
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sizeof(m_wy1) +
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sizeof(m_wx2) +
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sizeof(m_wy2) +
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sizeof(m_dx1) +
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sizeof(m_dy1) +
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sizeof(m_kx) +
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sizeof(m_ky);
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}
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void serialize(int8u* ptr) const
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{
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memcpy(ptr, &m_world_x1, sizeof(m_world_x1)); ptr += sizeof(m_world_x1);
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memcpy(ptr, &m_world_y1, sizeof(m_world_y1)); ptr += sizeof(m_world_y1);
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memcpy(ptr, &m_world_x2, sizeof(m_world_x2)); ptr += sizeof(m_world_x2);
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memcpy(ptr, &m_world_y2, sizeof(m_world_y2)); ptr += sizeof(m_world_y2);
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memcpy(ptr, &m_device_x1, sizeof(m_device_x1)); ptr += sizeof(m_device_x1);
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memcpy(ptr, &m_device_y1, sizeof(m_device_y1)); ptr += sizeof(m_device_y1);
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memcpy(ptr, &m_device_x2, sizeof(m_device_x2)); ptr += sizeof(m_device_x2);
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memcpy(ptr, &m_device_y2, sizeof(m_device_y2)); ptr += sizeof(m_device_y2);
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memcpy(ptr, &m_aspect, sizeof(m_aspect)); ptr += sizeof(m_aspect);
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memcpy(ptr, &m_align_x, sizeof(m_align_x)); ptr += sizeof(m_align_x);
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memcpy(ptr, &m_align_y, sizeof(m_align_y)); ptr += sizeof(m_align_y);
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memcpy(ptr, &m_wx1, sizeof(m_wx1)); ptr += sizeof(m_wx1);
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memcpy(ptr, &m_wy1, sizeof(m_wy1)); ptr += sizeof(m_wy1);
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memcpy(ptr, &m_wx2, sizeof(m_wx2)); ptr += sizeof(m_wx2);
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memcpy(ptr, &m_wy2, sizeof(m_wy2)); ptr += sizeof(m_wy2);
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memcpy(ptr, &m_dx1, sizeof(m_dx1)); ptr += sizeof(m_dx1);
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memcpy(ptr, &m_dy1, sizeof(m_dy1)); ptr += sizeof(m_dy1);
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memcpy(ptr, &m_kx, sizeof(m_kx)); ptr += sizeof(m_kx);
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memcpy(ptr, &m_ky, sizeof(m_ky)); ptr += sizeof(m_ky);
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}
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void deserialize(const int8u* ptr)
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{
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memcpy(&m_world_x1, ptr, sizeof(m_world_x1)); ptr += sizeof(m_world_x1);
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memcpy(&m_world_y1, ptr, sizeof(m_world_y1)); ptr += sizeof(m_world_y1);
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memcpy(&m_world_x2, ptr, sizeof(m_world_x2)); ptr += sizeof(m_world_x2);
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memcpy(&m_world_y2, ptr, sizeof(m_world_y2)); ptr += sizeof(m_world_y2);
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memcpy(&m_device_x1, ptr, sizeof(m_device_x1)); ptr += sizeof(m_device_x1);
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memcpy(&m_device_y1, ptr, sizeof(m_device_y1)); ptr += sizeof(m_device_y1);
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memcpy(&m_device_x2, ptr, sizeof(m_device_x2)); ptr += sizeof(m_device_x2);
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memcpy(&m_device_y2, ptr, sizeof(m_device_y2)); ptr += sizeof(m_device_y2);
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memcpy(&m_aspect, ptr, sizeof(m_aspect)); ptr += sizeof(m_aspect);
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memcpy(&m_align_x, ptr, sizeof(m_align_x)); ptr += sizeof(m_align_x);
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memcpy(&m_align_y, ptr, sizeof(m_align_y)); ptr += sizeof(m_align_y);
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memcpy(&m_wx1, ptr, sizeof(m_wx1)); ptr += sizeof(m_wx1);
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memcpy(&m_wy1, ptr, sizeof(m_wy1)); ptr += sizeof(m_wy1);
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memcpy(&m_wx2, ptr, sizeof(m_wx2)); ptr += sizeof(m_wx2);
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memcpy(&m_wy2, ptr, sizeof(m_wy2)); ptr += sizeof(m_wy2);
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memcpy(&m_dx1, ptr, sizeof(m_dx1)); ptr += sizeof(m_dx1);
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memcpy(&m_dy1, ptr, sizeof(m_dy1)); ptr += sizeof(m_dy1);
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memcpy(&m_kx, ptr, sizeof(m_kx)); ptr += sizeof(m_kx);
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memcpy(&m_ky, ptr, sizeof(m_ky)); ptr += sizeof(m_ky);
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}
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private:
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void update();
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double m_world_x1;
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double m_world_y1;
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double m_world_x2;
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double m_world_y2;
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double m_device_x1;
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double m_device_y1;
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double m_device_x2;
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double m_device_y2;
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aspect_ratio_e m_aspect;
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double m_align_x;
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double m_align_y;
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double m_wx1;
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double m_wy1;
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double m_wx2;
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double m_wy2;
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double m_dx1;
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double m_dy1;
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double m_kx;
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double m_ky;
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};
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//-----------------------------------------------------------------------
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inline void trans_viewport::update()
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{
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double world_x1 = m_world_x1;
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double world_y1 = m_world_y1;
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double world_x2 = m_world_x2;
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double world_y2 = m_world_y2;
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double device_x1 = m_device_x1;
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double device_y1 = m_device_y1;
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double device_x2 = m_device_x2;
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double device_y2 = m_device_y2;
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if(m_aspect != aspect_ratio_stretch)
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{
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double d;
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m_kx = (device_x2 - device_x1) / (world_x2 - world_x1);
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m_ky = (device_y2 - device_y1) / (world_y2 - world_y1);
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if((m_aspect == aspect_ratio_meet) == (m_kx < m_ky))
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{
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d = (world_y2 - world_y1) * m_ky / m_kx;
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world_y1 += (world_y2 - world_y1 - d) * m_align_y;
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world_y2 = world_y1 + d;
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}
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else
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{
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d = (world_x2 - world_x1) * m_kx / m_ky;
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world_x1 += (world_x2 - world_x1 - d) * m_align_x;
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world_x2 = world_x1 + d;
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}
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}
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m_wx1 = world_x1;
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m_wy1 = world_y1;
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m_wx2 = world_x2;
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m_wy2 = world_y2;
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m_dx1 = device_x1;
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m_dy1 = device_y1;
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m_kx = (device_x2 - device_x1) / (world_x2 - world_x1);
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m_ky = (device_y2 - device_y1) / (world_y2 - world_y1);
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}
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}
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#endif
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