OpenGl dots look like dash -

what cause opengl dots dash lines? trying draw 2 separate lines. 1 contains dashes , other 1 contain dots. supposed dotted line, appears dashes when compile , run program. here code:

#include <windows.h> #include <gl/gl.h> #include <gl/glu.h> #include <gl/glut.h>      // (or others, depending on system in use) //#include <stdlib.h>   void init() {     glclearcolor (1.0, 1.0, 1.0, 0.0);  /* set display-window color white.                                            r,g,b,alpha alpha 0.0 transparent */     glmatrixmode (gl_projection);       //  set projection parameters.      gluortho2d (0.0, 250.0, 0.0, 250.0); // set display area } void linesegment() { glclear (gl_color_buffer_bit);  // clear display window. color buffer     glcolor3f (0.0, 0.0, 1.0);      // set line segment color green.  //glenable(gl_line_stipple);   int p1 [] = {0,80}; int p2 [] = {50, 50}; int p3 [] = {100, 100}; int p4 [] = {150, 75}; int p5 [] = {200, 120}; int p6 [] = {0, 50}; int p7 [] = {50, 100}; int p8 [] = {100,80 }; int p9 [] = {150, 150}; int p10 [] = {200, 60};   //double width dashed line  glenable(gl_line_stipple); gllinewidth(2); gllinestipple (1, 0x00ff); /* dashed */ glbegin(gl_line_strip); glvertex2iv (p1); glvertex2iv(p2); glvertex2iv (p3); glvertex2iv (p4); glvertex2iv (p5);   gldisable (gl_line_stipple);   glend();   glcolor3f (1.0, 0.0, 1.0);      // set line segment color green.  glenable(gl_line_stipple);          gllinewidth(3); gllinestipple (1, 0x0101); /* dotted */ glbegin(gl_line_strip); glvertex2iv (p6); glvertex2iv(p7); glvertex2iv (p8); glvertex2iv (p9); glvertex2iv (p10);   gldisable (gl_line_stipple);    glend();                           glflush ( );     // process opengl routines possible.  }  int main(int argc, char *argv[]) {     glutinit (&argc, argv);                         // initialize glut.     glutinitdisplaymode (glut_single | glut_rgb);   // set display mode, single buffering.     glutinitwindowposition (50, 100);   // set top-left display-window position.     glutinitwindowsize (400, 300);      // set display-window width , height.     glutcreatewindow ("dash , dots "); // create display window.     init( );                            // execute initialization procedure.     glutdisplayfunc (linesegment);       // send graphics display window.     glutmainloop ( );                    // display , wait.     return exit_success;    } 

set line width on dotted line 1.0.