eddys_snippets/image_view_module/events.c

/*
 * events.c
 *
 * Copyright 2015 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */
#include "events.h"
#include "imageview.h"
#include "macros.h"

/**
 * manage pressed keys & menu items
 */
void processKeybrd(unsigned char key, int mod, int win_GL_ID, _U_ int x, _U_ int y){
	windowData *win = searchWindow_byGLID(win_GL_ID);
	if(!win) return;
	if((mod == GLUT_ACTIVE_CTRL) && (key == 'q' || key == 17)) exit(0); // ctrl + q
	switch(key){
		case '1': // return zoom to 1 & image to 0
			win->zoom = 1;
			win->x = 0; win->y = 0;
		break;
		case 27:
			destroyWindow_async(win_GL_ID);
		break;
		case 'Z':
			win->zoom *= 1.1;
			calc_win_props(win, NULL, NULL);
		break;
		case 'z':
			win->zoom /= 1.1;
			calc_win_props(win, NULL, NULL);
		break;
	}
}

/*
 *	Process keyboard
 */
void keyPressed(unsigned char key,
				_U_ int x, _U_ int y){
	int mod = glutGetModifiers();
	int window = glutGetWindow();
	//mod: GLUT_ACTIVE_SHIFT, GLUT_ACTIVE_CTRL, GLUT_ACTIVE_ALT; result is their sum
	//DBG("Key pressed. mod=%d, keycode=%d, point=(%d,%d)\n", mod, key, x,y);
	if((mod == GLUT_ACTIVE_CTRL) && (key == 'q' || key == 17)) exit(0); // ctrl + q
	processKeybrd(key, mod, window, x, y);
}

void keySpPressed(_U_ int key, _U_ int x, _U_ int y){
//	int mod = glutGetModifiers();
	DBG("Sp. key pressed. mod=%d, keycode=%d, point=(%d,%d)\n", glutGetModifiers(), key, x,y);
}

int oldx, oldy;         // coordinates when mouse was pressed
int movingwin = 0; // ==1 when user moves image by middle button
void mousePressed(_U_ int key, _U_ int state, _U_ int x, _U_ int y){
// key: GLUT_LEFT_BUTTON, GLUT_MIDDLE_BUTTON, GLUT_RIGHT_BUTTON
// state: GLUT_UP, GLUT_DOWN
	int window = glutGetWindow(), mod = glutGetModifiers();
	windowData *win = searchWindow_byGLID(window);
	if(!win) return;
	if(state == GLUT_DOWN){
		oldx = x; oldy = y;
		float X,Y;
		conv_mouse_to_image_coords(x,y,&X,&Y,win);
		DBG("press in (%d, %d) == (%f, %f) on image; mod == %d", x,y,X,Y, mod);
		if(key == GLUT_MIDDLE_BUTTON) movingwin = 1;
		if(key == 3){ // wheel UP
			if(mod == 0) win->y += 10.*win->zoom; // nothing pressed - scroll up
			else if(mod == GLUT_ACTIVE_SHIFT) win->x -= 10.*win->zoom; // shift pressed - scroll left
			else if(mod == GLUT_ACTIVE_CTRL) win->zoom *= 1.1; // ctrl+wheel up == zoom+
		}else if(key == 4){ // wheel DOWN
			if(mod == 0) win->y -= 10.*win->zoom; // nothing pressed - scroll down
			else if(mod == GLUT_ACTIVE_SHIFT) win->x += 10.*win->zoom; // shift pressed - scroll right
			else if(mod == GLUT_ACTIVE_CTRL) win->zoom /= 1.1; // ctrl+wheel down == zoom-
		}
		calc_win_props(win, NULL, NULL);
	}else{
		movingwin = 0;
	}
/*	DBG("Mouse button %s. point=(%d, %d); mod=%d, button=%d\n",
		(state == GLUT_DOWN)? "pressed":"released", x, y, glutGetModifiers(), key);*/

/*	int window = glutGetWindow();
	if(window == WaveWindow){ // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> <20><><EFBFBD><EFBFBD> <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
		_U_ int w = glutGet(GLUT_WINDOW_WIDTH) / 2;
		_U_ int h = glutGet(GLUT_WINDOW_HEIGHT) / 2;
		if(state == GLUT_DOWN && key == GLUT_LEFT_BUTTON){
			//HistCoord[0] = (x > w);
			//HistCoord[1] = (y > h);
		}
	}
*/
}
/* this doesn't work
void mouseWheel(int button, int dir, int x, int y){
	int window = glutGetWindow();
	windowData *win = searchWindow_byGLID(window);
	if(!win) return;
	DBG("Mouse wheel, dir: %d. point=(%d, %d); mod=%d, button=%d\n",
		dir, x, y, glutGetModifiers(), button);
}
*/
void mouseMove(_U_ int x, _U_ int y){
	int window = glutGetWindow();
	windowData *win = searchWindow_byGLID(window);
	if(!win) return;
	//DBG("Mouse moved to (%d, %d)\n", x, y);
	if(movingwin){
		float X, Y, nx, ny, w2, h2;
		float a = win->Daspect;
		X = (x - oldx) * a; Y = (y - oldy) * a;
		nx = win->x + X;
		ny = win->y - Y;
		w2 = win->image->w / 2. * win->zoom;
		h2 = win->image->h / 2. * win->zoom;
		if(nx < w2 && nx > -w2)
			win->x = nx;
		if(ny < h2 && ny > -h2)
			win->y = ny;
		oldx = x;
		oldy = y;
		calc_win_props(win, NULL, NULL);
	}
}

void menuEvents(int opt){
	FNAME();
	int window = glutGetWindow();
	if(opt == 'q') exit(0);
	processKeybrd((unsigned char)opt, 0, window, 0, 0);
}

/**
 * winID - inner !!!
 */
void createMenu(int GL_ID){
	FNAME();
	windowData *win;
	win = searchWindow_byGLID(GL_ID);
	glutSetWindow(GL_ID);
	if(win->menu) glutDestroyMenu(win->menu);
	win->menu = glutCreateMenu(menuEvents);
	DBG("created menu %d\n", win->menu);
	glutAddMenuEntry("Quit (ctrl+q)", 'q');
	glutAddMenuEntry("Close this window (ESC)", 27);
	glutAddMenuEntry("Restore zoom (1)", '1');
	glutAttachMenu(GLUT_RIGHT_BUTTON);
}