Geografic-Information-System/display/d.zoom/quit.c

#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <grass/gis.h>
#include <grass/display.h>
#include "local_proto.h"
#include <grass/glocale.h>

int quit(struct Cell_head *defwin, struct Cell_head *currwin)
{

    int screen_x, screen_y, button;
    int hand = 0;
    double ux1, uy1, ux2, uy2, ew, ns;

    fprintf(stderr, "\n\nButtons:\n");
    fprintf(stderr, "Left:   reset to default region\n");
    fprintf(stderr, "Middle: reset to region before d.zoom started\n");
    fprintf(stderr, "Right:  Quit\n");

    R_get_location_with_pointer(&screen_x, &screen_y, &button);

    if (button == 1) {
	ew = defwin->east - defwin->west;
	ns = defwin->north - defwin->south;

	if (ns <= defwin->ns_res) {
	    ns = 2 * defwin->ns_res;
	}

	if (ew <= defwin->ew_res) {
	    ew = 2 * defwin->ew_res;
	}

	ux1 = defwin->east;
	ux2 = defwin->west;
	uy1 = defwin->north;
	uy2 = defwin->south;

	set_win(defwin, ux1, uy1, ux2, uy2, hand);
	return 0;
    }

    if (button == 2) {
	ew = currwin->east - currwin->west;
	ns = currwin->north - currwin->south;

	if (ns <= currwin->ns_res) {
	    ns = 2 * currwin->ns_res;
	}

	if (ew <= currwin->ew_res) {
	    ew = 2 * currwin->ew_res;
	}

	ux1 = currwin->east;
	ux2 = currwin->west;
	uy1 = currwin->north;
	uy2 = currwin->south;

	set_win(currwin, ux1, uy1, ux2, uy2, hand);
	return 0;
    }

    if (button == 3) {
	return 0;
    }

    return 0;

}