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/* This demo program shows you how to use the colormaps. It's fairly
* simple.
*
* Dominic Giampaolo
* dbg@sgi.com
*/
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <math.h>
#include "libsx.h" /* should come first, defines libsx stuff */
#include "main.h" /* where program specific stuff is defined */
#include "callbacks.h" /* prototypes for callback functions */
/* define's */
#define X_SIZE 300 /* default draw area size, change as desired */
#define Y_SIZE 300
int main(int argc, char **argv)
{
MyProgram mydata;
mydata.cur_colormap = RAINBOW_1;
init_display(argc, argv, &mydata); /* setup the display */
MainLoop(); /* go right into the main loop */
return 0;
}
/* This function sets up the display. For any kind of a real program,
* you'll probably want to save the values returned by the MakeXXX calls
* so that you have a way to refer to the display objects you have
* created (like if you have more than one drawing area, and want to
* draw into both of them).
*/
void init_display(int argc, char **argv, MyProgram *me)
{
int i;
Widget w[5];
if (OpenDisplay(argc, argv) == FALSE)
return;
w[0] = MakeButton("Next ColorMap", next_cmap, me);
w[1] = MakeButton("Prev ColorMap", prev_cmap, me);
w[2] = MakeButton("Quit!", quit, me);
w[3] = MakeLabel("The ColorMap Demo");
w[4] = MakeDrawArea(X_SIZE, Y_SIZE, redisplay, me);
SetWidgetPos(w[1], PLACE_RIGHT, w[0], NO_CARE, NULL);
SetWidgetPos(w[2], PLACE_RIGHT, w[1], NO_CARE, NULL);
SetWidgetPos(w[3], PLACE_RIGHT, w[2], NO_CARE, NULL);
SetWidgetPos(w[4], PLACE_UNDER, w[0], NO_CARE, NULL);
/* This call actually causes the whole thing to be displayed on the
* screen. You have to call this function before doing any drawing
* into the window.
*/
ShowDisplay();
/* We are going to take over the colormap and install our own.
* This will cause the colors in other windows to get wacked out, but
* hey, that's the price you pay for nice smooth gradients. :-)
*
* Also note that after we've called GetAllColors(), we can call
* SetColorMap() as often as we like.
*/
GetAllColors();
SetColorMap(me->cur_colormap);
/* Now we make the widget outlines and text visible even though we've
* taken over the colormap. Otherwise they kind of become invisible.
* This isn't the most foolproof way in the world to do this, but
* it works for most colormaps.
*/
for(i=0; i < 4; i++)
{
SetFgColor(w[i], 255);
SetBorderColor(w[i], 255);
}
}
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