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#ifndef lint
static char SccsId[] = "%W% %G%";
#endif
/* Module: clrvary.c (Color Vary)
* Purpose: Interactive color manipulation keyed to mouse position
* Subroutine: vary_colors() returns: void
* Copyright: 1989 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 15 June 1989
* {n} <who> -- <does what> -- <when>
*/
#include <X11/Xlib.h> /* X window stuff */
#include <X11/Xutil.h> /* X window manager stuff */
#include "hfiles/constant.h" /* define mode codes */
#include "hfiles/struct.h" /* declare structure types */
#include "hfiles/extern.h" /* extern main parameter structures */
#include "hfiles/cgraph.h" /* color graph structs */
#include "hfiles/define.h" /* define SQR */
extern struct cgraphRec cgraph;
/*
* Subroutine: vary_colors
* Purpose: Modify colors as per mode and the mouse position
*/
void vary_colors ( event, mode, track, x, y, width, height )
XEvent *event; /* i: details of event to check button states */
int mode; /* i: code for type of varying */
int track; /* i: update graphbox displays */
int x, y; /* i: mouse coords (could be adjusted) */
int width, height; /* i: dimensions bby which to judge control */
{
double threshold, saturation;
double contrast, bias;
double gamma;
int button1, button2, button3;
void make_cellmap_from_table(), make_cellstore_from_cellmaps();
void vary_contrast_and_bias(), draw_cgraph(), label_gamma();
if( event->xbutton.state & ControlMask ) {
button1 = (event->xbutton.state & Button1Mask);
button2 = (event->xbutton.state & Button2Mask);
button3 = (event->xbutton.state & Button3Mask);
if( event->type == ButtonPress ) {
button1 |= (event->xbutton.button == Button1);
button2 |= (event->xbutton.button == Button2);
button3 |= (event->xbutton.button == Button3);
}
} else {
button1 = 1;
button2 = 1;
button3 = 1;
}
/* gamma is horizontal */
if( mode == VOP_gamma ) {
/* ranges from 0.0 to 4.0, with 1.0 in the middle */
gamma = SQR((double)(2 * x) / (double)width);
if( button1 ) {
color.ctable.red.do_gamma = 1;
color.ctable.red.gamma = gamma;
make_cellmap_from_table(&color.ctable.red);
cgraph.red.unset = 1;
}
if( button2 ) {
color.ctable.green.do_gamma = 1;
color.ctable.green.gamma = gamma;
make_cellmap_from_table(&color.ctable.green);
cgraph.green.unset = 1;
}
if( button3 ) {
color.ctable.blue.do_gamma = 1;
color.ctable.blue.gamma = gamma;
make_cellmap_from_table(&color.ctable.blue);
cgraph.blue.unset = 1;
}
if( graphbox.active )
label_gamma(button1, button2, button3 );
} else {
/* make y increase from the bottom */
y = height - y;
if( mode == VOP_ThreshSat ) {
/* threshold is parallel to the color bar, saturation is perpendicular */
/* threshold varies from -1 to 1, saturation varies from 0 to 2 */
threshold = ((double)(x * 2) / (double)width) - 1.0;
saturation = (double)(y * 2) / (double)height;
contrast = saturation - threshold;
bias = (threshold + saturation) / 2;
} else if( mode == VOP_ContBias ) {
/* make x parallel to color bar */
/* bias is parallel to the color bar, contrast is perpendicular */
/* contrast varies from 0 to 2 */
contrast = (double)(2 * y) / (double)height;
/* bias ranges from (0.0 - contrast/2) to (1.0 + contrast/2) */
bias = (double)x / (double)width;
/* adjust bias to control full range for any contrast */
bias += ((bias - 0.5) * contrast);
} else
return;
if( button1 ) {
vary_contrast_and_bias(&color.ctable.red, contrast, bias);
make_cellmap_from_table(&color.ctable.red);
cgraph.red.unset = 1;
}
if( button2 ) {
vary_contrast_and_bias(&color.ctable.green, contrast, bias);
make_cellmap_from_table(&color.ctable.green);
cgraph.green.unset = 1;
}
if( button3 ) {
vary_contrast_and_bias(&color.ctable.blue, contrast, bias);
make_cellmap_from_table(&color.ctable.blue);
cgraph.blue.unset = 1;
}
}
/* update the server colormap */
make_cellstore_from_cellmaps(&color);
XStoreColors(color.display, color.colormap, color.cellstore, color.ncolors);
if( track && graphbox.active )
/* update the color graph */
draw_cgraph(0, 0);
}
/*
* Subroutine: vary_contrast_and_bias
* Purpose: change color table cell_levels as per new contrast and bias
*/
void vary_contrast_and_bias ( table, contrast, bias )
struct subtableRec *table;
double contrast; /* i: normal = 1.0 */
double bias; /* i: normal = 0.5 */
{
double *base_level, *cell_level;
int vertex_cnt;
static void invert_table();
base_level = table->base_level;
cell_level = table->cell_level;
vertex_cnt = table->vertex_cnt;
if( contrast < 0.0 ) {
int i, j;
if( table->invert_order == 0 )
invert_table(table);
for( i=0, j=vertex_cnt - 1; i<vertex_cnt; i++, j-- )
cell_level[i] = (base_level[j] * contrast) + bias;
} else {
int i;
if( table->invert_order )
invert_table(table);
for( i=0; i<vertex_cnt; i++ )
cell_level[i] = (base_level[i] * contrast) + bias;
}
table->bias = bias;
table->contrast = contrast;
}
static void invert_table ( table )
struct subtableRec *table;
{
int i, j;
double *intensity;
intensity = table->intensity;
for( i = 0, j = table->vertex_cnt - 1; i < j; i++, j-- ) {
double temp;
temp = intensity[i];
intensity[i] = intensity[j];
intensity[j] = temp;
}
table->invert_order ^= 1;
}
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