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xcolormap
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xcolormap.c
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C/C++ Source or Header
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1992-01-11
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5KB
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175 lines
/*
* Copyright 1991 John L. Cwikla
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appears in all copies and that
* both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of John L. Cwikla or
* University of Illinois not be used in advertising or publicity
* pertaining to distribution of the software without specific, written
* prior permission. John L. Cwikla and University of Illinois make no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* John L. Cwikla and University of Illinois disclaim all warranties with
* regard to this software, including all implied warranties of
* merchantability and fitness, in no event shall John L. Cwikla or
* University of Illinois be liable for any special, indirect or
* consequential damages or any damages whatsoever resulting from loss of
* use, data or profits, whether in an action of contract, negligence or
* other tortious action, arising out of or in connection with the use or
* performance of this software.
*
* Author:
* John L. Cwikla
* Materials Research Laboratory Center for Computation
* University Of Illinois at Urbana-Champaign
* 104 S. Goodwin
* Urbana, IL 61801
*
* cwikla@uimrl7.mrl.uiuc.edu
*/
#include <X11/IntrinsicP.h>
#include <X11/Intrinsic.h>
#include <X11/StringDefs.h>
#include <X11/Shell.h>
#include <X11/Core.h>
#include <stdio.h>
#include <math.h>
#define APPNAME "XColormap"
#ifdef ULONG_NEEDED
typedef unsigned long ulong;
#endif
static Display *TheDisplay;
static GC TheGC;
static ulong NumColors;
static ulong Width = 10; /* Of the squares */
static ulong Height = 10; /* Of the squares */
static ulong Margin = 2; /* space between squares */
static ulong Xcolor, Ycolor; /* Number of colors per direction in the matrix */
static int TheScreenNo;
static void DrawSquare(Drawable d, int i)
{
int row, col, x, y;
row = i / Xcolor;
col = i % Xcolor;
x = (Width + Margin) * col + Margin;
y = (Height + Margin) * row + Margin;
XSetForeground(TheDisplay, TheGC, i);
XFillRectangle(TheDisplay, d, TheGC, x, y,
Width, Height);
}
static void RedrawWindow(Drawable d)
{
int i;
for(i=0;i<NumColors;i++)
DrawSquare(d, i);
}
static void Redraw(Widget w)
{
RedrawWindow(XtWindow(w));
}
static void Resize(Widget wid)
{
Width = (wid->core.width - Margin)/Xcolor - Margin;
Height = (wid->core.height - Margin)/Xcolor - Margin;
XClearWindow(TheDisplay, XtWindow(wid));
Redraw(wid);
}
static void QuitIt()
{
printf("Have a nice day. --JLC\n");
exit(1);
}
main(int argc, char *argv[])
{
Widget colorwidget, toplevel;
XtAppContext app;
Arg warg[2];
int n;
ulong xWindowWidth, yWindowHeight;
XtToolkitInitialize();
app = XtCreateApplicationContext();
TheDisplay = XtOpenDisplay (app, NULL, APPNAME, APPNAME,
NULL, 0, &argc, argv);
if (!TheDisplay)
{
XtWarning ("%s: can't open display, exiting...", APPNAME);
exit (0);
}
TheScreenNo = DefaultScreen(TheDisplay);
NumColors = XDisplayCells(TheDisplay, TheScreenNo);
Xcolor = (int)floor(sqrt(NumColors)); /* Best try at a square */
Ycolor = NumColors/Xcolor;
if ((argc == 2) && (!strncmp(argv[1], "-root", 5)))
{
Drawable TheWindow;
Pixmap ThePixmap;
xWindowWidth = DisplayWidth(TheDisplay, TheScreenNo);
yWindowHeight = DisplayHeight(TheDisplay, TheScreenNo);
Width = (xWindowWidth - Margin)/Xcolor - Margin;
Height = (yWindowHeight - Margin)/Xcolor - Margin;
printf("Display is %d x %d.\n", xWindowWidth, yWindowHeight);
TheWindow = RootWindow(TheDisplay, TheScreenNo);
ThePixmap = XCreatePixmap(TheDisplay, TheWindow,
xWindowWidth, yWindowHeight, DefaultDepth(TheDisplay, TheScreenNo));
TheGC = XCreateGC(TheDisplay, TheWindow, NULL, 0);
RedrawWindow(ThePixmap);
XSetWindowBackgroundPixmap(TheDisplay, TheWindow,
ThePixmap);
XClearWindow(TheDisplay, TheWindow);
while(XtAppPending(app))
{
XEvent event;
XtAppNextEvent(app, &event);
XtDispatchEvent(&event);
}
XFreeGC(TheDisplay, TheGC);
XFreePixmap(TheDisplay, ThePixmap);
exit(0);
}
colorwidget = XtAppCreateShell (APPNAME, APPNAME,
applicationShellWidgetClass, TheDisplay, NULL, 0);
xWindowWidth = Xcolor * (Width + Margin) + Margin; /* Actual window width */
yWindowHeight = Ycolor * (Height + Margin) + Margin; /* Actual window height */
n = 0;
XtSetArg(warg[n], XtNwidth, xWindowWidth); n++;
XtSetArg(warg[n], XtNheight, yWindowHeight); n++;
toplevel = XtCreateManagedWidget("TopLevel", widgetClass,
colorwidget, warg, n);
XtRealizeWidget(colorwidget);
XtAddEventHandler(toplevel, ButtonPressMask, FALSE, QuitIt, NULL);
XtAddEventHandler(toplevel, ExposureMask, FALSE, Redraw, NULL);
XtAddEventHandler(toplevel, StructureNotifyMask, FALSE, Resize, NULL);
TheGC = XCreateGC(TheDisplay, XtWindow(toplevel), NULL, 0);
XtAppMainLoop(app);
}