Solved

How can I calculate the area of an odd shape?

Posted on 2008-10-10
2
1,371 Views
Last Modified: 2008-12-10
I am developing a small graphics program in which users can draw a variety of shapes and then get the area of the shape by clicking inside the shape or on the shape itself. However, I've run into a problem...How can I get the area of a shape when a user clicks inside of it?

I would like to be able to calculate the area without having to store specific lines and location for each shape. Something similar to the FloodFill API would be great, where it just looks for lines that intersect of a specific color and then returns the area it found.
0
Comment
Question by:chan1928
2 Comments
 
LVL 84

Accepted Solution

by:
ozo earned 500 total points
ID: 22688551
0
 
LVL 8

Expert Comment

by:BdLm
ID: 22694812
the algo Floodfill
---------------------

       Create an empty   Pixel/ Bitarray(x,y)  x:= 0....x_max,   y:=0...y_max
       
       set all Pixel/ bits to zero  eg:  Bit(x,y) :=0 ;
     
       draw all your polygon lines on this Pixel/bitarray, set these bits to 1
       
      get a starting pixel/Bit
     
     
      repeat
            repeat
                 setall Pixel(xi,y) to your color
           until  next xi+1 Pixel is 1
            move one line up
                 
       until  can't find a Pixel(xy) = 0 in the next row          

       

can you code byyourself using drectly a Bitmap ?
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Whether you’re a college noob or a soon-to-be pro, these tips are sure to help you in your journey to becoming a programming ninja and stand out from the crowd.
If you need to start windows update installation remotely or as a scheduled task you will find this very helpful.
The goal of the tutorial is to teach the user how to use functions in C++. The video will cover how to define functions, how to call functions and how to create functions prototypes. Microsoft Visual C++ 2010 Express will be used as a text editor an…
This lesson covers basic error handling code in Microsoft Excel using VBA. This is the first lesson in a 3-part series that uses code to loop through an Excel spreadsheet in VBA and then fix errors, taking advantage of error handling code. This l…

863 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

27 Experts available now in Live!

Get 1:1 Help Now