The header file graphics.h contains setlinestyle() function which sets the style for all lines drawn by line, lineto, rectangle, drawpoly, and so on.
Syntax :
void setlinestyle(int linestyle, unsigned upattern, int thickness);
Examples :
Input : x = 200, y = 100 Output : x and y are initialized as (200, 100). For every line, value of y increments by 25 to change the position. The line style keep changing corresponding to value of first parameter(c).
Explanation : linestyle specifies in which of several styles subsequent lines will be drawn (such as solid, dotted, centered, dashed).
upattern is a 16-bit pattern that applies only if linestyle is USERBIT_LINE (4). In that case, whenever a bit in the pattern word is 1, the corresponding pixel in the line is drawn in the current drawing color. A value for ‘upattern’ must always be supplied. It is simply ignored if ‘linestyle’ is not USERBIT_LINE (4).
thickness specifies whether the width of subsequent lines drawn will be normal or thick.
Below is the implementation of setlinestyle() function :
// C Implementation for setlinestyle() #include <graphics.h> // driver code int main()
{ // gm is Graphics mode which is
// a computer display mode that
// generates image using pixels.
// DETECT is a macro defined in
// "graphics.h" header file
int gd = DETECT, gm;
// variable to change the
// line styles
int c;
// initial coordinate to
// draw line
int x = 200, y = 100;
// initgraph initializes the
// graphics system by loading a
// graphics driver from disk
initgraph(&gd, &gm, "" );
// To keep track of lines
for ( c = 0 ; c < 5 ; c++ )
{
// setlinestyle function
setlinestyle(c, 0, 1);
// Drawing line
line(x, y, x+200, y);
y = y + 25;
}
getch();
// closegraph function closes the
// graphics mode and deallocates
// all memory allocated by
// graphics system .
closegraph();
return 0;
} |
Output :