Thread: How can i draw a line?

What am i missing?

Code:

#include <stdio.h>
#include <graphics.h>

int main(void){
	InitGraphics(0.5, 0.5);
	Drawline(0.0, 1.0);
return 0;
}

Grab a pen & paper, put the pen in your hand, make sure the tip is exposed & start moving the tip of the pen on the paper.

Originally Posted by madmax2006

Grab a pen & paper, put the pen in your hand, make sure the tip is exposed & start moving the tip of the pen on the paper.

You forgot 2 important steps:

1) get out of bed in the morning...

2) turn off the computer...

Then start using the the pencil and paper.

Brack, you should be able to get to help on this, by putting your cursor on the word (maybe Drawline() here), and pressing a key combination: f1,and ctrl+f1 are popular choices.

This is how it's done in Turbo C, and some info.

Code:

 /*
 line   Draws a line between two specified points.

 Syntax:
   void far line(int x1, int y1, int x2, int y2);

 Prototype in:
 graphics.h

 Remarks:
Draws a line from (x1,y1) to (x2,y2) using the current color, line style,
and thickness. It does not update the current position (CP).

 Return Value: None.

 Portability:
This function is unique to Turbo C++.

It works only with IBM PCs and compatibles equipped with supported graphics
display adapters.

 See Also:
  getlinesettings    lineto      setlinestyle
  linerel            setcolor    setwritemode

 Example:
 */

 #include <graphics.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <conio.h>

 int main(void)
 {
    /* request auto detection */
    int gdriver = DETECT, gmode, errorcode;
    int xmax, ymax;

    /* initialize graphics and local variables */
    initgraph(&gdriver, &gmode, "");

    /* read result of initialization */
    errorcode = graphresult();
    /* an error occurred */
    if (errorcode != grOk)
    {
       printf("Graphics error: %s\n", grapherrormsg(errorcode));
       printf("Press any key to halt:");
       getch();
       exit(1);
    }

    setcolor(getmaxcolor());
    xmax = getmaxx();
    ymax = getmaxy();

    /* draw a diagonal line */
    line(0, 0, xmax, ymax);
    /* draw a rectangle */
    line(70, 50, 300, 50);
    line(300, 50, 300, 150);
    line(300, 150, 70, 150);
    line(70, 150, 70, 50);
    /* clean up */
    getch();
    closegraph();
    return 0;
 }

This works in Windows XP.

Originally Posted by Salem

Without you telling us which OS / Compiler / graphics library you're using - who the hell knows.

I mean, you didn't even post any error messages.

thank you salem...

I did not knew that OS/Compiler needed...
i use ubuntu 10.04 LTS. and my programs are written in gedit and compiled with the gcc/g++ command (in terminal).

If there is anything else you want to know please let me know...
oh, i don' t know which library i should use. Actually this is my problem...

Grab a pen & paper, put the pen in your hand, make sure the tip is exposed & start moving the tip of the pen on the paper.

Oh, so you can not write a program...only using paper eh? you probably have some more things to learn...

Code:

Quote:
Originally Posted by madmax2006 View Post
Grab a pen & paper, put the pen in your hand, make sure the tip is exposed & start moving the tip of the pen on the paper.
You forgot 2 important steps:

1) get out of bed in the morning...

2) turn off the computer...

Then start using the the pencil and paper.

advice: grab a pc and start programing so as sometime you can draw in the screen...

thank you...i' ll check this out...

You didn't load the graphics driver.

See my info and program in this thread, post #5 for how to do it.

and Welcome to the forum, Nellaikrishna!