1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
#include <stdio.h>
#include <X11/Xaw/Command.h>
#define N 10
typedef struct { double X;
double Y; } COORDINATES;
#define NIL (0)
void PLOT_CURVE(double F[N] , double X[N],
COORDINATES Min, COORDINATES Max )
{ //---------PLOT EDGES IN A BITMAP PICTURE-------//
Display *dpy;
int Width = 400; //Width of picture in pixels
int Height= 400; //Height of picture in pixels
Pixmap Edge_pix;
GC Edge_gc;
dpy = XOpenDisplay(NIL);
Edge_pix = XCreatePixmap (dpy, RootWindowOfScreen (DefaultScreenOfDisplay (dpy)), Width, Height, 1);
int White = BlackPixel (dpy, DefaultScreen (dpy)); //This is strange but there is an inversion of colours
int Black = WhitePixel (dpy, DefaultScreen (dpy));
Edge_gc = XCreateGC (dpy, Edge_pix, 0, 0);
XSetForeground(dpy, Edge_gc, White);
XFillRectangle (dpy, Edge_pix, Edge_gc, 0, 0, Width-1, Height-1);
XSetForeground(dpy, Edge_gc, Black);
//PLOTING EDGE POINTS ON PIXMAP
#include <string.h>
char buffer[5];
int i, Xi, Yi;
for(i = 0; i<N; i++)
{ sprintf(buffer, "%d", i);
Xi = (int)( (X[i]-Min.X)/(Max.X-Min.X)*Width );
Yi = (int)( Height-(F[i]-Min.Y)/(Max.Y-Min.Y)*Height);
XDrawString(dpy, Edge_pix, Edge_gc, Xi, Yi, buffer, strlen(buffer) );
XDrawPoint (dpy, Edge_pix, Edge_gc, Xi, Yi );
}
//WE WRITE A PICTURE YOU CAN CONVERT IN GIF WITH: convert Edges.bmp Edges.gif
XWriteBitmapFile (dpy, "Picture.bmp", Edge_pix, Width, Height, -1, -1);
XFreePixmap(dpy, Edge_pix);
}
int main()
{ double F[N], X[N];
COORDINATES Min, Max; //Extremum points to plot
int i;
for(i=0; i<N; i++)
{ F[i]=(double)(i*i);
X[i]=(double)i;
}
Min.X = 0; Max.X = N;
Min.Y = 0; Max.Y = N*N;
PLOT_CURVE(F, X, Min, Max);
printf("Picture.bmp has been created\n");
return 0;
} |
