How to draw line ( slanting line ) vertically in an image in c++?

Question

4.00/5 (1 vote)

See more:

Hello,

How to draw line ( slanting line ) vertically ???

For Ex :
Consider X1 = 100, Y1 = 80; And X2=100, Y2 = 185;

So This is for Straight LINE

C++

for(nRow = Y1; nRow < Y2; nRow++)
{
  for(nCol = X1; nCol < X2; nCol++)
  {
     nPixPos = nRow*nEffectiveWidth+nCol*3; 

     Image[nPixPos] = 0 ;
     Image[nPixPos+1] = 0 ;
     Image[nPixPos+2] = 0 ;
  }
}

If i want to draw Line for EX :X1 = 100 , Y1 = 80 and X2 = 115 , Y2 = 185

HOW TO DRAW Slanting Line for the above CO-ORDINATES - how to use for loop then ???

Posted 9-May-12 19:44pm

Pixel86

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2012-05-09T19:55:00

Solution 1

Oh boy! I haven't implemented one of those in what...twenty years?

There are a lot of ways to do it: some simple, and some much, much better. Wiki has a list: http://en.wikipedia.org/wiki/Line_drawing_algorithm[^] - pick one you like and off you go!

(But don't expect them to look as good as the standard Windows line drawing functions unless you put in a lot of work. Look up antialiasing while you are at it.)

Posted 9-May-12 19:55pm

OriginalGriff

Comments

JackDingler 10-May-12 15:38pm

We don't do much in the way of primitives work anymore. The current graphics cards and APIs handle that very well.

It is a fascinating area to work in though.