#include <graphics.h> void setlinestyle(int linestyle, unsigned upattern, int thickness);
The linesettingstype structure is defined in graphics.h as follows:
struct linesettingstype {
int linestyle;
unsigned upattern;
int thickness;
};
linestyle specifies in which of several styles subsequent lines will be drawn (such as solid, dotted, centered, dashed). The enumeration line_styles, which is defined in graphics.h, gives names to these operators:
| Name | Value | Description
| SOLID_LINE | 0 | Solid line
| DOTTED_LINE | 1 | Dotted line
| CENTER_LINE | 2 | Centered line
| DASHED_LINE | 3 | Dashed line
| USERBIT_LINE | 4 | User-defined line style
| |
| Name | Value | Description
| NORM_WIDTH | 1 | 1 pixel wide
| THICK_WIDTH | 3 | 3 pixels wide
| |
Note: The linestyle parameter does not affect arcs, circles, ellipses, or pie slices. Only the thickness parameter is used.
/* setlinestyle example */
#include <graphics.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <conio.h>
/* the names of the line styles supported */
char *lname[] = { "SOLID_LINE", "DOTTED_LINE", "CENTER_LINE", "DASHED_LINE", "USERBIT_LINE" };
int main(void)
{
/* request autodetection */
int gdriver = DETECT, gmode, errorcode;
int style, midx, midy, userpat;
char stylestr[40];
/* initialize graphics and local variables */
initgraph(&gdriver, &gmode, "");
/* read result of initialization */
errorcode = graphresult();
if (errorcode != grOk) { /* an error occurred */
printf("Graphics error: %s\n", grapherrormsg(errorcode));
printf("Press any key to halt:");
getch();
exit(1); /* terminate with an error code */
}
midx = getmaxx() / 2;
midy = getmaxy() / 2;
/* a user-defined line pattern */
/* binary: "0000000000000001" */
userpat = 1;
for (style=SOLID_LINE; style<=USERBIT_LINE; style++)
{
/* select the line style */
setlinestyle(style, userpat, 1);
/* convert style into a string */
strcpy(stylestr, lname[style]);
/* draw a line */
line(0, 0, midx-10, midy);
/* draw a rectangle */
rectangle(0, 0, getmaxx(), getmaxy());
/* output a message */
outtextxy(midx, midy, stylestr);
/* wait for a key */
getch();
cleardevice();
}
/* clean up */
closegraph();
return 0;
}