libdockapp/examples/basic/basic.c

   1 /*
   2  * Copyright (c) 2002 Alban G. Hertroys
   3  *
   4  * Basic example of libDockapp usage
   5  *
   6  * This dockapp will draw a rectangle with a
   7  * bouncing ball in it.
   8  */
   9
  10 /* also includes Xlib, Xresources, XPM, stdlib and stdio */
  11 #include <dockapp.h>
  12 #include <time.h>
  13
  14 /* include the pixmap to use */
  15 #include "ball_red.xpm"
  16
  17 #define SPEED 20
  18 #define MAX_MOVE 4
  19
  20 /*
  21  * Prototypes for local functions
  22  */
  23 void drawRelief(Pixmap pixmap);
  24 void moveBall(void);
  25 void destroy(void);
  26
  27 /*
  28  * Global variables
  29  */
  30 Window ballWin;
  31 DAShapedPixmap *ballPix;
  32
  33 /*
  34  * M A I N
  35  */
  36
  37 int
  38 main(int argc, char **argv)
  39 {
  40         unsigned int x = 1, y = 1;
  41         Pixmap back;
  42         DACallbacks eventCallbacks = {
  43                 destroy, /* destroy */
  44                 NULL, /* buttonPress */
  45                 NULL, /* buttonRelease */
  46                 NULL, /* motion (mouse) */
  47                 NULL, /* mouse enters window */
  48                 NULL, /* mouse leaves window */
  49                 moveBall /* timeout */
  50         };
  51
  52         /* provide standard command-line options */
  53         DAParseArguments(
  54                 argc, argv, /* Where the options come from */
  55                 NULL, 0, /* Our list with options - none as you can see */
  56                 "This is the help text for the basic example of how to "
  57                 "use libDockapp.\n",
  58                 "Basic example version 1.1");
  59
  60         /* Tell libdockapp what version we expect it to be (a date from
  61          * NEWS should do).
  62          */
  63         DASetExpectedVersion(20020126);
  64
  65         DAOpenDisplay(
  66                 NULL /* default display */,
  67                 argc, argv /* needed by libdockapp */
  68                 );
  69         DACreateIcon(
  70                 "daBasicExample" /* WM_CLASS hint; don't use chars in [.?*: ] */,
  71                 48, 48 /* geometry of dockapp internals */,
  72                 argc, argv      /* needed by libdockapp */
  73                 );
  74
  75         /* The pixmap that makes up the background of the dockapp */
  76         back = DAMakePixmap();
  77         drawRelief(back);
  78         DASetPixmap(back);
  79         XFreePixmap(DADisplay, back);
  80
  81         /* A window(!) for the ball pixmap.
  82          * Moving a window is a lot easier then erasing/copying the pixmap all
  83          * the time.
  84          *
  85          * I use a DAShapedPixmap here, which contains all the information
  86          * related to the pixmap: pixmap, mask and geometry.
  87          */
  88         ballPix = DAMakeShapedPixmapFromData(ball_red_xpm);
  89         ballWin = XCreateSimpleWindow(DADisplay, DAWindow,
  90                                       x, y,
  91                                       /* Use the geometry of the shaped pixmap */
  92                                       ballPix->geometry.width, ballPix->geometry.height,
  93                                       0, 0, 0);
  94         DASPSetPixmapForWindow(ballWin, ballPix);
  95
  96         /* Respond to destroy and timeout events (the ones not NULL in the
  97          * eventCallbacks variable.
  98          */
  99         DASetCallbacks(&eventCallbacks);
 100
 101         /* Set the time for timeout events (in msec) */
 102         DASetTimeout(SPEED);
 103
 104         /* Randomize movement variation.
 105          * Run multiple versions of the dockapp simultaneously to see the effect
 106          * best.
 107          * (which function to use is set from the Imakefile)
 108          */
 109 #ifdef HAS_RANDOMDEV
 110         srandomdev();
 111 #else
 112         srandom(time(NULL));
 113 #endif
 114
 115         DAShow(); /* Show the dockapp window. */
 116
 117         /* Process events and keep the dockapp running */
 118         DAEventLoop();
 119
 120         /* not reached */
 121         exit(EXIT_SUCCESS);
 122 }
 123
 124
 125 void
 126 drawRelief(Pixmap pixmap)
 127 {
 128         XGCValues gcv;
 129         GC lightGrayGC, darkGrayGC;
 130
 131         /* GC's */
 132         gcv.foreground = DAGetColor("Navy");
 133         XChangeGC(DADisplay, DAClearGC, GCForeground, &gcv);
 134
 135         gcv.foreground = DAGetColor("lightGray");
 136         gcv.graphics_exposures = False;
 137
 138         lightGrayGC = XCreateGC(DADisplay, DAWindow,
 139                                 GCForeground | GCGraphicsExposures, &gcv);
 140
 141         gcv.foreground = DAGetColor("#222222");
 142         darkGrayGC  =  XCreateGC(DADisplay, DAWindow,
 143                                  GCForeground | GCGraphicsExposures, &gcv);
 144
 145         /* Drawing */
 146         XFillRectangle(DADisplay, pixmap, DAClearGC, 1, 1, 46, 46);
 147
 148         XDrawLine(DADisplay, pixmap, darkGrayGC, 0, 0, 0, 46);
 149         XDrawLine(DADisplay, pixmap, darkGrayGC, 1, 0, 47, 0);
 150
 151         XDrawLine(DADisplay, pixmap, lightGrayGC, 0, 47, 47, 47);
 152         XDrawLine(DADisplay, pixmap, lightGrayGC, 47, 1, 47, 46);
 153
 154         /* Free the GC's, we don't use them anymore */
 155         XFreeGC(DADisplay, lightGrayGC);
 156         XFreeGC(DADisplay, darkGrayGC);
 157 }
 158
 159
 160 void
 161 moveBall(void)
 162 {
 163         static int x = 1;
 164         static int y = 1;
 165         static int dx;
 166         static int dy;
 167         signed int var = random() % 3 - 1;
 168
 169         if (dx == 0)
 170                 dx = var;
 171
 172         if (dy == 0)
 173                 dy = var;
 174
 175         if (dx > MAX_MOVE)
 176                 dx = MAX_MOVE;
 177
 178         if (dy > MAX_MOVE)
 179                 dy = MAX_MOVE;
 180
 181         /* calculate new position */
 182         x += dx;
 183         y += dy;
 184
 185         if (x < 1) {
 186                 x = 1;
 187                 dx = -dx + var;
 188         }
 189
 190         if (y < 1) {
 191                 y = 1;
 192                 dy = -dy + var;
 193         }
 194
 195         if (x + ballPix->geometry.width > 46) {
 196                 x = 46 - ballPix->geometry.width;
 197                 dx = -dx + var;
 198         }
 199
 200         if (y + ballPix->geometry.height > 46) {
 201                 y = 46 - ballPix->geometry.height;
 202                 dy = -dy + var;
 203         }
 204
 205         XMoveWindow(DADisplay, ballWin, x, y);
 206 }
 207
 208
 209 void
 210 destroy(void)
 211 {
 212         XFreePixmap(DADisplay, ballPix->pixmap);
 213         XFreePixmap(DADisplay, ballPix->shape);
 214
 215         fprintf(stderr, "Destroyed!\n");
 216         /* exit is done by libdockapp */
 217 }