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/* This file contains callback routines that implement the logic of your
* program. The function init_display() in main.c built the display
* and setup the connection between these functions and the user interface
* elements.
*
* If you add a function to this file, you should also add a function
* prototype for it to the callbacks.h file (unless it is an internal
* function, then you should just add it down below where it says
* "internal prototypes").
*
* -- This code is under the GNU copyleft --
*
* Dominic Giampaolo
* dbg@sgi.com
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <time.h>
#include <math.h>
#include "libsx.h"
#include "main.h"
#include "time.h"
#include "callbacks.h"
/* -- CALLBACK ROUTINES --
*
* These functions are called when various things happen in your windows.
* They should handle what happened and give feedback to the user. Most
* likely they will set options in your program (which is what the
* MyProgram data structure is for), and cause different things to happen,
* like loading and saving files, etc.
*/
void quit(Widget w, void *data)
{
/* Do any cleanup that is necessary for your program here */
exit(0);
}
void load(Widget w, void *data)
{
char *string;
string = GetString("\nEnter a filename to load\n", "untitled");
if (string)
printf("You entered the name: %s\n", string);
else
printf("You clicked the cancel button.\n");
}
void click_me(Widget w, void *data)
{
MyProgram *me = (MyProgram *)data;
int ans;
ans = GetYesNo("\nAre you a weenie?\n\n");
if (ans)
{
me->var1 = TRUE;
printf("The user is a weenie.\n");
}
else
{
me->var2 = FALSE;
printf("You are not a weenie.\n");
}
}
/*
* The following is the redisplay code for the drawing area widget.
*
* Each time it needs to be redisplayed (either because it the window
* was resized or because it was obscured), this function gets called.
*/
void redisplay(Widget w, int width, int height, void *data)
{
ClearDrawArea(); /* start with a clean slate */
draw_stuff(width, height);
}
void draw_stuff(int width, int height)
{
draw_lines(width, height);
draw_random_lines();
draw_points();
draw_text(width, height);
}
void draw_lines(int width, int height)
{
int i;
SetColor(BLACK); /* draw some pretty patterns */
for(i=0; i < width; i+=5)
DrawLine(0,i, i,height);
SetColor(GREEN);
for(i=0; i < width; i+=5)
DrawLine(width,i, width-i,height);
}
void draw_random_lines(void)
{
int i;
XPoint xpts[50];
srand(time(NULL) | 0x01); /* seed the random number generator */
for(i=0; i < 50; i++)
{
xpts[i].x = (rand() % 75) + 75; /* pick random vertices */
xpts[i].y = (rand() % 75) + 75;
}
SetColor(RED);
DrawPolyline(xpts, 50); /* now draw all 50 of them in red */
}
void draw_points(void)
{
int i, x,y;
srand(time(NULL) | 0x01); /* seed the random number generator */
SetColor(BLUE);
for(i=0; i < 100; i++)
{
x = (rand() % 75) + 150; /* pick a random point */
y = (rand() % 75) + 75;
DrawPixel(x, y); /* now draw it on the screen */
}
}
void draw_text(int width, int height)
{
SetColor(BLACK);
DrawText("My Cool Program", (width/2)-50, height/2);
}
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