int Init_X (int swidth, int sheight)
{
XGCValues vals;
Colormap TheColormap;
XColor TheColor;
int i;
Dv = 1 ;
TheWidth = swidth ;
TheHeight = sheight ;
TheDisplay = XOpenDisplay("\0");
TheRootWindow = DefaultRootWindow(TheDisplay);
TheScreenNumber = DefaultScreen(TheDisplay);
TheDepth = DefaultDepth(TheDisplay, TheScreenNumber);
if (TheDepth != 24) {
printf("24 bit color not supported.\n") ;
printf("Color function not likely to work.\n") ;
return 0 ;
}
///////////////////////////////////////////////////////////////////
int maxwidth,maxheight ;
maxwidth = XDisplayWidth(TheDisplay,TheScreenNumber) ;
maxheight = XDisplayHeight(TheDisplay,TheScreenNumber) ;
if ((swidth > maxwidth) || (sheight > maxheight)) {
printf("Requested dimensions of %dx%d exceeds max possible of %dx%d.\n",
swidth,sheight,maxwidth,maxheight) ;
printf("Drawing to buffer only.\n") ;
Dv = 0 ;
}
///////////////////////////////////////////////////////////////////
if (Dv) {
TheWindow = XCreateSimpleWindow(TheDisplay, TheRootWindow,
0, 0, TheWidth, TheHeight, 0, 0, 0);
if (!TheWindow) return 0 ;
}
ThePixmap = XCreatePixmap(TheDisplay, TheRootWindow, TheWidth, TheHeight,
TheDepth);
if (!ThePixmap) return 0 ;
TheDrawable = ThePixmap;
if (Dv) {
XMapWindow(TheDisplay, TheWindow);
XSelectInput(TheDisplay, TheWindow, ExposureMask |
StructureNotifyMask |
PointerMotionMask |
ButtonPressMask |
KeyPressMask );
}
if (Dv) {
vals.graphics_exposures = 0; // False
TheWindowContext = XCreateGC(TheDisplay, TheWindow,
GCGraphicsExposures, &vals);
if (!TheWindowContext) return 0;
}
ThePixmapContext = XCreateGC(TheDisplay, ThePixmap, 0, 0);
if (!ThePixmapContext) return 0;
TheColormap = DefaultColormap(TheDisplay, TheScreenNumber);
TheFontInfo = XLoadQueryFont(TheDisplay, TheFont) ;
// XSetFont(TheDisplay, TheWindowContext, TheFontInfo->fid) ;
XSetFont(TheDisplay, ThePixmapContext, TheFontInfo->fid) ;
if (Dv) {
XClearArea(TheDisplay, TheWindow, 0,0,0,0,True);
}
// most people expect a white piece of paper
// with a black pencil
Set_Color_Rgb_X (255,255,255) ; // white
Clear_Buffer_X() ; // otherwise you can inherit garbage
// from the parent window
Copy_Buffer_X() ;
if (Dv) {
XFlush(TheDisplay);
}
Set_Color_Rgb_X (0,0,0) ; // black pencil
return 1 ;
}
int Init_X (int swidth, int sheight)
{
XGCValues vals;
Colormap TheColormap;
XColor TheColor;
int i;
TheWidth = swidth ;
TheHeight = sheight ;
TheDisplay = XOpenDisplay("\0");
TheRootWindow = DefaultRootWindow(TheDisplay);
TheScreenNumber = DefaultScreen(TheDisplay);
TheDepth = DefaultDepth(TheDisplay, TheScreenNumber);
if (TheDepth != 24) {
printf("24 bit color not supported.\n") ;
printf("Color function not likely to work.\n") ;
}
TheWindow = XCreateSimpleWindow(TheDisplay, TheRootWindow,
0, 0, TheWidth, TheHeight, 0, 0, 0);
if (!TheWindow) return 0 ;
ThePixmap = XCreatePixmap(TheDisplay, TheRootWindow, TheWidth, TheHeight,
TheDepth);
if (!ThePixmap) return 0 ;
TheDrawable = ThePixmap;
XMapWindow(TheDisplay, TheWindow);
XSelectInput(TheDisplay, TheWindow, ExposureMask |
StructureNotifyMask |
PointerMotionMask |
ButtonPressMask |
KeyPressMask );
/*
TheWindowContext = XCreateGC(TheDisplay, TheWindow, 0, 0);
// this is a bad idea ... see test t02.c for an example
// of what can happen to the behavior of the event handler,
// int Handle_Events_X(int *px, int *py)
// if you do this, you'll get runaway calls to Handle_Events
// with the default condition being met and this produces
// a great deal of tearing in the animation of t02.c
*/
/* also a bad idea...same behavior as above
vals.graphics_exposures = 1; // True
*/
// so this is what you want :
vals.graphics_exposures = 0; // False
TheWindowContext = XCreateGC(TheDisplay, TheWindow,
GCGraphicsExposures, &vals);
if (!TheWindowContext) return 0;
ThePixmapContext = XCreateGC(TheDisplay, ThePixmap, 0, 0);
if (!ThePixmapContext) return 0;
TheColormap = DefaultColormap(TheDisplay, TheScreenNumber);
for(i = 0; i < 256; i++) {
TheColor.green = TheColor.blue = TheColor.red = (i << 8) | i;
TheColor.flags = DoRed | DoGreen | DoBlue;
XAllocColor(TheDisplay, TheColormap, &TheColor);
Grays[i] = TheColor.pixel;
}
TheFontInfo = XLoadQueryFont(TheDisplay, TheFont) ;
XSetFont(TheDisplay, TheWindowContext, TheFontInfo->fid) ;
// XClearWindow(TheDisplay, TheWindow);
// XClearArea(TheDisplay, TheWindow, 0,0,0,0,False); // same as above
XClearArea(TheDisplay, TheWindow, 0,0,0,0,True);
// Does the boolean matter here?
// most people expect a white piece of paper
// with a black pencil
Set_Color_Rgb_X (255,255,255) ; // white
Clear_Buffer_X() ; // otherwise you can inherit garbage
// from the parent window
// Set_Color_Rgb_X (255,0,255) ; // purple
// Fill_Rectangle_X(10,10,50,80) ;
// above was just a test
Copy_Buffer_X() ;
XFlush(TheDisplay);
// XSync(TheDisplay, False) ; // seems unnecessary
Set_Color_Rgb_X (0,0,0) ; // black pencil
return 1 ;
}