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96 lines
3.5 KiB
96 lines
3.5 KiB
/**
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* \file rasterize.h
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*
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* \brief Methoden um auf ein Canvas zu zeichnen
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*
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* Der rasterizer stellt Methoden zur verfügung um auf ein canvas zu
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* zeichnen. Darunter den Canvas zu leeren, Punkt, Linie, Polygon
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* (gefüllt und ungefüllt) und Polyeder zeichnen und die Farbe
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* eines bestimmten Punktes im Zeichenpuffer ermitteln.
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* Diese Klasse ist abstrakt. Ein Rasterizer wird immer von einem
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* Canvas erzeugt werden, damit man einen zu diesem Canvas passenden
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* Rasteriser hat. Implementiert ist ein Software-Rasterizer zum zeichnen
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* auf ein X11 oder X11-shm Canvas.
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*
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* \author Georg Steffers <georg@steffers.org>
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*
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* \date 04.12.2003
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*
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* \version ..2002 (Georg Steffers): erste funktionierende Implementation
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* \version 04.12.2003 (Georg Steffers): beginn der Dokumentation via doxygen
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*/
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/*
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* Copyright (C)2003 Georg Steffers
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef __rasterizer_h__
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#define __rasterizer_h__
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#include "canvas_imps/canvas_imp.h"
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#include "geometry/polygon.h"
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#include "geometry/polyeder.h"
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class rasterizer {
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protected:
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unsigned x_size;
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unsigned y_size;
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canvas_imp* sinfo;
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vertex_list screen_p_vl;
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polygon screen_p;
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double** zbuf;
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public:
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rasterizer(unsigned = 0, unsigned = 0, canvas_imp* = NULL);
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virtual void clear_buffer(void) const=0;
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virtual void draw_point(unsigned x, unsigned y,
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unsigned long col) const=0;
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virtual void line(double, double, double, double,
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unsigned long) const=0;
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virtual void draw_polygon_flat(const polygon&, unsigned long) const=0;
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virtual void draw_polygon_wire(const polygon&, unsigned long) const=0;
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virtual void draw_polyeder_wire(const polyeder&, unsigned long) const=0;
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unsigned long get_color(unsigned red, unsigned green, unsigned blue) {
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return sinfo->ext_to_native(red, green, blue);
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}
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virtual unsigned get_x_size(void) const { return x_size; }
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virtual unsigned get_y_size(void) const { return y_size; }
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};
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class sw_rasterizer : public rasterizer {
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private:
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unsigned char* adr_of_point(unsigned, unsigned) const;
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void draw_point_at_paddress(unsigned char**, unsigned long) const;
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public:
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sw_rasterizer(unsigned xs, unsigned ys, canvas_imp* ci) :
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rasterizer(xs, ys, ci) {}
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void clear_buffer(void) const;
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void draw_point(unsigned x, unsigned y, unsigned long col) const;
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void line(double, double, double, double, unsigned long) const;
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void draw_polygon_flat(const polygon&, unsigned long) const;
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void draw_polygon_wire(const polygon&, unsigned long) const;
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void draw_polyeder_wire(const polyeder&, unsigned long) const;
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};
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#endif // __rasterize_h__
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