get_win.c

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#include <stdio.h>
#include <grass/raster.h>

int get_win_w_mouse(float *top, float *bottom, float *left, float *right)
{
    int button;
    int st, sb, sl, sr;
    int t, b, l, r;

    st = R_screen_top();
    sb = R_screen_bot();
    sl = R_screen_left();
    sr = R_screen_rite();

    fprintf(stderr, "\nButtons:\n");
    fprintf(stderr, "Left:   Establish a corner\n");
    fprintf(stderr, "Right:  Accept window\n");

    l = sl;
    b = sb;
    r = l + 10;
    t = b - 10;

    do {
        R_get_location_with_box(l, b, &r, &t, &button);
        if (button == 1) {
            l = r;
            b = t;
        }
    } while (button != 3);

    if (l > r) {
        button = l;
        l = r;
        r = button;
    }

    if (t > b) {
        button = t;
        t = b;
        b = button;
    }
    *bottom = 100. - 100. * (b - st) / (sb - st);
    *top = 100. - 100. * (t - st) / (sb - st);
    *left = 100. * (l - sl) / (sr - sl);
    *right = 100. * (r - sl) / (sr - sl);

    return 0;
}