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panwndw.c
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C/C++ Source or Header
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1990-04-20
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5KB
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141 lines
#ifndef lint
static char SccsId[] = "%W% %G%";
#endif
/* Module: panwndw.c (Pan Window)
* Purpose: Size the pan window to fit the image area and set it up
* Subroutine: init_panbox_dimensions() returns: void
* Subroutine: init_panbox_coords() returns: void
* Subroutine: new_panbox() returns: void
* Extern: screen_width, screen_height in WndwInit.c
* Extern: button_left, button_middle, button_hmin in WndwConfig.c
* Xlib calls: none
* Copyright: 1988 Smithsonian Astrophysical Observatory
* You may do anything you like with this file except remove
* this copyright. The Smithsonian Astrophysical Observatory
* makes no representations about the suitability of this
* software for any purpose. It is provided "as is" without
* express or implied warranty.
* Modified: {0} Michael VanHilst initial version 21 December 1988
* {n} <who> -- <does what> -- <when>
*/
#include <X11/Xlib.h> /* X window stuff */
#include <X11/Xutil.h> /* window manager stuff */
#include "hfiles/define.h" /* define MIN, MAX, etc */
#include "hfiles/struct.h" /* all struct record types */
#include "hfiles/extern.h" /* major declared structs */
/* root window dimensions in wndwinit.c */
extern int screen_width, screen_height;
static double ip_zoom;
static int pan_xwidth, pan_yheight;
/*
* Subroutine: init_panbox_dimensions
* Purpose: Set size of the panbox to fit exact area of image img specs.
* Called by: new_panbox() below
* Called by: configure_windowgroup() in WndwConfig.c to init or regroup.
*/
void init_panbox_dimensions ( )
{
int xzoom, yzoom;
/* calculate the drawing area for the given window size */
pan_xwidth = panbox.hints.max_width - (2 * panbox.xzero);
pan_yheight = panbox.hints.max_height - (2 * panbox.yzero);
/* select a zoom factor which fits image within pan window */
xzoom = (coord.img.width - 1) / pan_xwidth + 1;
yzoom = (coord.img.height - 1) / pan_yheight + 1;
if( (xzoom > 1) || (yzoom > 1) ) {
/* big image rule: zoom for which one dimension is window size or less */
ip_zoom = 1.0 / (double)MAX(xzoom,yzoom);
} else {
/* small image rule: zoom for which one side is greater than 1/2 window */
xzoom = pan_xwidth / coord.img.width;
yzoom = pan_yheight / coord.img.height;
ip_zoom = (double)MIN(xzoom,yzoom);
}
/* specify pan window size for perfect fit to zoomed img */
pan_xwidth = (int)((double)coord.img.width * ip_zoom);
pan_yheight = (int)((double)coord.img.height * ip_zoom);
panbox.hints.width = pan_xwidth + (2 * panbox.xzero);
panbox.hints.height = pan_yheight + (2 * panbox.yzero);
/* aspect ratio may put one side below minimum */
if( panbox.hints.min_width > panbox.hints.width )
panbox.hints.min_width = panbox.hints.width;
if( panbox.hints.min_height > panbox.hints.height )
panbox.hints.min_height = panbox.hints.height;
/* set sizing guidlines to maintain image aspect ratio */
panbox.hints.min_aspect.x = coord.img.width;
panbox.hints.max_aspect.x = coord.img.width;
panbox.hints.min_aspect.y = coord.img.height;
panbox.hints.max_aspect.y = coord.img.height;
}
/*
* Subroutine: init_panbox_coords
* Purpose: Set the panbox coordinate system for the actual window.
* Note: Drawing area must be as decided above in init_panbox1.
*/
void init_panbox_coords ( )
{
void get_window_dimensions();
void set_coordsys(), set_transform(), combine_transform(), set_edges();
panbox.xzero = MAX(0, ((int)panbox.width - pan_xwidth)/2);
panbox.yzero = MAX(0, ((int)panbox.height - pan_yheight)/2);
panbox.xwidth = pan_xwidth;
panbox.yheight = pan_yheight;
/* fill out pan window coordinate system parameters */
set_coordsys(&coord.pan, 0.5, (int)panbox.width, (int)panbox.height,
panbox.xzero, panbox.yzero, panbox.xzero + panbox.xwidth - 1,
panbox.yzero + panbox.yheight - 1);
/* compute coordinate conversions between pan and img systems */
set_transform(coord.img.cenX, coord.img.cenY, ip_zoom,
&coord.pan, &coord.img, &coord.pantoimg, &coord.imgtopan);
combine_transform(&coord.pantofile, &coord.pantoimg, &coord.imgtofile);
set_edges(&coord.pantofile, &coord.file, &coord.pan, &coord.fp);
}
/*
* Subroutine: new_panbox
* Purpose: Create or readjust panbox (coord.img must be set).
* Called by: imtool_response()
*/
void new_panbox ( newdata )
int newdata; /* boolean to force loading new image */
{
int diff;
int changed = 0;
void init_panbox_dimensions(), init_panbox_coords(), init_panbuf();
void new_panimage(), new_pancursor();
/* choose size to fit image aspect ratio for blocked pan image */
init_panbox_dimensions();
/* if window was changed */
if( (panbox.hints.width != panbox.width) ||
(panbox.hints.height != panbox.height) ) {
/* resize the window (this causes an expose event) */
diff = panbox.width - panbox.hints.width;
panbox.width = panbox.hints.width;
panbox.height = panbox.hints.height;
if( diff ) {
panbox.x += diff;
XMoveResizeWindow(panbox.display, panbox.ID, panbox.x, panbox.y,
panbox.width, panbox.height);
} else
XResizeWindow(panbox.display, panbox.ID, panbox.width, panbox.height);
changed = 1;
}
init_panbox_coords();
/* get bigger buffer if needed */
init_panbuf();
if( newdata || changed ) {
/* create a new image to fit the panbox */
new_panimage();
/* set up the new panbox display area cursor */
new_pancursor(0);
}
}