114 lines
3.0 KiB
C++
114 lines
3.0 KiB
C++
/*
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Copyright (C) 2001-2006, William Joseph.
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All Rights Reserved.
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This file is part of GtkRadiant.
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GtkRadiant 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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GtkRadiant 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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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#if !defined ( INCLUDED_XORRECTANGLE_H )
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#define INCLUDED_XORRECTANGLE_H
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#include <gtk/gtkwidget.h>
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#include "math/vector.h"
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class rectangle_t
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{
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public:
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rectangle_t()
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: x( 0 ), y( 0 ), w( 0 ), h( 0 )
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{}
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rectangle_t( float _x, float _y, float _w, float _h )
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: x( _x ), y( _y ), w( _w ), h( _h )
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{}
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float x;
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float y;
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float w;
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float h;
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};
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struct Coord2D
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{
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float x, y;
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Coord2D( float _x, float _y )
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: x( _x ), y( _y ){
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}
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};
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inline Coord2D coord2d_device2screen( const Coord2D& coord, unsigned int width, unsigned int height ){
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return Coord2D( ( ( coord.x + 1.0f ) * 0.5f ) * width, ( ( coord.y + 1.0f ) * 0.5f ) * height );
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}
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inline rectangle_t rectangle_from_area( const float min[2], const float max[2], unsigned int width, unsigned int height ){
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Coord2D botleft( coord2d_device2screen( Coord2D( min[0], min[1] ), width, height ) );
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Coord2D topright( coord2d_device2screen( Coord2D( max[0], max[1] ), width, height ) );
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return rectangle_t( botleft.x, botleft.y, topright.x - botleft.x, topright.y - botleft.y );
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}
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class XORRectangle
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{
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rectangle_t m_rectangle;
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GtkWidget* m_widget;
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GdkGC* m_gc;
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bool initialised() const {
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return m_gc != 0;
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}
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void lazy_init(){
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if ( !initialised() ) {
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m_gc = gdk_gc_new( m_widget->window );
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GdkColor color = { 0, 0xffff, 0xffff, 0xffff, };
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GdkColormap* colormap = gdk_window_get_colormap( m_widget->window );
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gdk_colormap_alloc_color( colormap, &color, FALSE, TRUE );
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gdk_gc_copy( m_gc, m_widget->style->white_gc );
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gdk_gc_set_foreground( m_gc, &color );
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gdk_gc_set_background( m_gc, &color );
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gdk_gc_set_function( m_gc, GDK_INVERT );
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}
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}
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void draw() const {
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const int x = float_to_integer( m_rectangle.x );
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const int y = float_to_integer( m_rectangle.y );
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const int w = float_to_integer( m_rectangle.w );
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const int h = float_to_integer( m_rectangle.h );
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gdk_draw_rectangle( m_widget->window, m_gc, FALSE, x, -( h ) - ( y - m_widget->allocation.height ), w, h );
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}
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public:
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XORRectangle( GtkWidget* widget ) : m_widget( widget ), m_gc( 0 ){
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}
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~XORRectangle(){
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if ( initialised() ) {
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gdk_gc_unref( m_gc );
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}
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}
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void set( rectangle_t rectangle ){
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if ( GTK_WIDGET_REALIZED( m_widget ) ) {
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lazy_init();
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draw();
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m_rectangle = rectangle;
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draw();
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}
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}
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};
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#endif
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