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