[Webinar] Learn how to a build a cloud-first strategyRegister Now

x
?
Solved

Figure Out Percentages

Posted on 2010-11-25
8
Medium Priority
?
323 Views
Last Modified: 2012-05-10
I am hoping that the experts can help me out with some calculations.

I am scanning an image (using EZTwain Pro). I place the scanned image in a Picture Box to allow manual cropping. When I place the image in the picture box, it shrinks it down to fit the picture box.

I know the size of the scanned image, and I know the size of the picture box.

I have to figure out how much percent smaller the picture box is than the scanned image. Then, when dragging my crop box over the image, I have to add (or multiply - I'm not sure) the percentage so that I can manipulate the scanned image (in memory).

For example:
The scanned image is 200 High X 100 Wide.
The Picture Box is 100 High X 50 Wide.
How do I figure out how much percent  smaller the Picture Box is than the scanned image?

Then, lets say I drag the crop box as follows:
picBox.Left = 10
picBox.Top = 20
CropBox.Width = 15
CropBox.Heigh = 25

Once I figure out how much percent smaller the PictureBox is, how do I go back to the scanned image and muliply? (by the percentage) the dimensions of my crop box (as if I am working on the  larger scanned image?

0
Comment
Question by:esmyhs
  • 4
  • 3
8 Comments
 
LVL 10

Accepted Solution

by:
hosneylk earned 2000 total points
ID: 34215660
scanned crop box width = cropbox width / pic box width * scanned image width
scanned crop box height = cropbox height / pic box height * scanned image height
0
 
LVL 85

Expert Comment

by:ozo
ID: 34215677
Do you want how much percent smaller for the area or for the linear dimensions?
Does 100% mean no change, or does 0% mean no chang
Can you change the ratio ot width to height?
0
 

Author Comment

by:esmyhs
ID: 34215685
hosneylk:

How would I be able to offset the Top and the Left?

ozo:

I'm not understanding your question. I need to drag the crop box on the visible image, which is proportionality smaller than the actual image in memory. I need to figure out how much smaller the image in the picture box is, and then apply the crop to the image in memory, based on those proportions.
0
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
LVL 10

Expert Comment

by:hosneylk
ID: 34215692
scanned crop box top = cropbox top * scanned image height / pic box height
scanned crop box left = cropbox left * scanned image width / pic box width
0
 

Author Comment

by:esmyhs
ID: 34215704
hosneylk:

Top and Height work perfect.

Width and Left are a little off. The image ends up being too narrow, and starting a little too far over to the right...

Any idea why this would happen?
0
 
LVL 10

Expert Comment

by:hosneylk
ID: 34215713
try using picturebox.ClientRectangle.Left and Height
0
 

Author Comment

by:esmyhs
ID: 34215737
Truth is that the top and height are off by a little as well. I will attribute it to something in the settings on how I am making the crop box. I should be able to find that problem on my own. If not, I'll open a new question.

Your code works perfect! Thanks a lot!
0
 
LVL 10

Expert Comment

by:hosneylk
ID: 34215739
glad to help :)
0

Featured Post

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

It was really hard time for me to get the understanding of Delegates in C#. I went through many websites and articles but I found them very clumsy. After going through those sites, I noted down the points in a easy way so here I am sharing that unde…
This article describes how to use a set of graphical playing cards to create a Draw Poker game in Excel or VB6.
Show developers how to use a criteria form to limit the data that appears on an Access report. It is a common requirement that users can specify the criteria for a report at runtime. The easiest way to accomplish this is using a criteria form that a…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…
Suggested Courses
Course of the Month20 days, 14 hours left to enroll

864 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