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/*----------------------------------------------------------------------*
* X from Haskell (PicoX)
*
* (c) 1993 Andy Gill
*
*----------------------------------------------------------------------*/
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xatom.h>
#include <stdio.h>
#include <strings.h>
/*----------------------------------------------------------------------*/
/* First the X Globals */
Display *MyDisplay;
int MyScreen;
Window MyWindow;
XEvent MyWinEvent;
GC DrawGC;
GC UnDrawGC;
/* and the Haskell globals */
typedef struct {
int HaskButtons[5];
int HaskPointerX,HaskPointerY;
int PointMoved;
} HaskGlobType;
HaskGlobType HaskGlob;
/*----------------------------------------------------------------------*/
/*
* Now the access functions into the haskell globals
*/
int haskGetButtons(int n)
{
return(HaskGlob.HaskButtons[n]);
}
int haskGetPointerX(void)
{
return(HaskGlob.HaskPointerX);
}
int haskGetPointerY(void)
{
return(HaskGlob.HaskPointerY);
}
/*----------------------------------------------------------------------*/
/*
*The (rather messy) initiualisation
*/
haskXBegin(int x,int y,int sty)
{
/*
* later include these via interface hacks
*/
/* (int argc, char **argv) */
int argc = 0;
char **argv = 0;
XSizeHints XHints;
int MyWinFG, MyWinBG,tmp;
if ((MyDisplay = XOpenDisplay("")) == NULL) {
fprintf(stderr, "Cannot connect to X server '%s'\n", XDisplayName(""));
exit(1);
}
MyScreen = DefaultScreen(MyDisplay);
MyWinBG = WhitePixel(MyDisplay, MyScreen);
MyWinFG = BlackPixel(MyDisplay, MyScreen);
XHints.x = x;
XHints.y = y;
XHints.width = x;
XHints.height = y;
XHints.flags = PPosition | PSize;
MyWindow =
XCreateSimpleWindow(
MyDisplay,
DefaultRootWindow(MyDisplay),
x,y, x, y,
5,
MyWinFG,
MyWinBG
);
XSetStandardProperties(
MyDisplay,
MyWindow,
"XLib for Glasgow Haskell",
"XLib for Glasgow Haskell",
None,
argv,
argc,
&XHints
);
/* Create drawing and erasing GC */
DrawGC = XCreateGC(MyDisplay,MyWindow,0, 0);
XSetBackground(MyDisplay,DrawGC,MyWinBG);
XSetForeground(MyDisplay,DrawGC,MyWinFG);
UnDrawGC = XCreateGC(MyDisplay,MyWindow,0, 0);
XSetBackground(MyDisplay,UnDrawGC,MyWinFG);
XSetForeground(MyDisplay,UnDrawGC,MyWinBG);
XSetGraphicsExposures(MyDisplay,DrawGC,False);
XSetGraphicsExposures(MyDisplay,UnDrawGC,False);
XMapRaised(MyDisplay,MyWindow);
/* the user should be able to choose which are tested for
*/
XSelectInput(
MyDisplay,
MyWindow,
ButtonPressMask | ButtonReleaseMask | PointerMotionMask
);
/* later have more drawing styles
*/
switch (sty)
{
case 0:
/* Andy, this used to be GXor not much use for Undrawing so I
changed it. (Not much use for colour either - see next
comment */
XSetFunction(MyDisplay,DrawGC,GXcopy);
XSetFunction(MyDisplay,UnDrawGC,GXcopy);
break;
case 1:
/* Andy, this can have totally bogus results on a colour screen */
XSetFunction(MyDisplay,DrawGC,GXxor);
XSetFunction(MyDisplay,UnDrawGC,GXxor);
break;
default:
/* Andy, is this really a good error message? */
printf(stderr,"Wrong Argument to XSet function\n");
}
/*
* reset the (Haskell) globals
*/
for(tmp=0;tmp<5;tmp++)
{
HaskGlob.HaskButtons[tmp] = 0;
}
HaskGlob.HaskPointerX = 0;
HaskGlob.HaskPointerY = 0;
HaskGlob.PointMoved = 0;
XFlush(MyDisplay);
}
/*----------------------------------------------------------------------*/
/* Boring X ``Do Something'' functions
*/
haskXClose(void)
{
XFreeGC( MyDisplay, DrawGC);
XFreeGC( MyDisplay, UnDrawGC);
XDestroyWindow( MyDisplay, MyWindow);
XCloseDisplay( MyDisplay);
return(0);
}
haskXDraw(x,y,x1,y1)
int x,y,x1,y1;
{
XDrawLine(MyDisplay,
MyWindow,
DrawGC,
x,y,x1,y1);
return(0);
}
haskXPlot(c,x,y)
int c;
int x,y;
{
XDrawPoint(MyDisplay,
MyWindow,
(c?DrawGC:UnDrawGC),
x,y);
return(0);
}
haskXFill(c,x,y,w,h)
int c;
int x, y;
int w, h;
{
XFillRectangle(MyDisplay,
MyWindow,
(c?DrawGC:UnDrawGC),
x, y, w, h);
return(0);
}
/*----------------------------------------------------------------------*/
/* This has to be called every time round the loop,
* it flushed the buffer and handles input from the user
*/
haskHandleEvent()
{
XFlush( MyDisplay);
while (XEventsQueued( MyDisplay, QueuedAfterReading) != 0) {
XNextEvent( MyDisplay, &MyWinEvent);
switch (MyWinEvent.type) {
case ButtonPress:
switch (MyWinEvent.xbutton.button)
{
case Button1: HaskGlob.HaskButtons[0] = 1; break;
case Button2: HaskGlob.HaskButtons[1] = 1; break;
case Button3: HaskGlob.HaskButtons[2] = 1; break;
case Button4: HaskGlob.HaskButtons[3] = 1; break;
case Button5: HaskGlob.HaskButtons[4] = 1; break;
}
break;
case ButtonRelease:
switch (MyWinEvent.xbutton.button)
{
case Button1: HaskGlob.HaskButtons[0] = 0; break;
case Button2: HaskGlob.HaskButtons[1] = 0; break;
case Button3: HaskGlob.HaskButtons[2] = 0; break;
case Button4: HaskGlob.HaskButtons[3] = 0; break;
case Button5: HaskGlob.HaskButtons[4] = 0; break;
}
break;
case MotionNotify:
HaskGlob.HaskPointerX = MyWinEvent.xmotion.x;
HaskGlob.HaskPointerY = MyWinEvent.xmotion.y;
HaskGlob.PointMoved = 1;
break;
default:
printf("UNKNOWN INTERUPT ???? (%d) \n",MyWinEvent.type);
break;
} /*switch*/
} /*if*/
return(0);
}
/*----------------------------------------------------------------------*/
/* A function to clear the screen
*/
haskXCls(void)
{
XClearWindow(MyDisplay,MyWindow);
}
/*----------------------------------------------------------------------*/
/* A function to write a string
*/
haskXDrawString(int x,int y,char *str)
{
return(0);
/* printf("GOT HERE %s %d %d",str,x,y);
XDrawString(MyDisplay,MyWindow,DrawGC,x,y,str,strlen(str));
*/
}
/*----------------------------------------------------------------------*/
extern int prog_argc;
extern char **prog_argv;
haskArgs()
{
return(prog_argc > 1 ? atoi(prog_argv[1]) : 0);
}
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