Solved

How can the scale (zoom in/out) be changed?

Posted on 1997-11-04
2
620 Views
Last Modified: 2013-11-20
How can the scale (zoom in/out) be changed?

I am trying to change the 'scale' of  drawn images (lines, rectangles…).I have tried using ScaleViewportExt() and ScaleWindowExt() in combination with MapMode(MM_ANISOTROPIC), SetWindowOrg(), SetWindowExt(), SetViewportOrg() and SetViewportExt(), but have had no luck -my image remains unchanged. Any help dealing with drawings using the CClientDC would be a great, thanks.
0
Comment
Question by:Malek103197
2 Comments
 
LVL 23

Accepted Solution

by:
chensu earned 50 total points
ID: 1309379
The following code scales 2 times in X direction and 5 times in Y direction.

CClientDC dc(this);

dc.SetMapMode(MM_ANISOTROPIC);
dc.SetWindowExt(1, 1);
dc.SetViewportExt(2, 5);

// your drawing code
...

0
 

Author Comment

by:Malek103197
ID: 1309380
The basic concept provided in the answer is correct, but I still had to adddress the issue of changing the origin as the scale changes, otherwise the image would "walk" across the screen. Thanks for the help.
0

Featured Post

Courses: Start Training Online With Pros, Today

Brush up on the basics or master the advanced techniques required to earn essential industry certifications, with Courses. Enroll in a course and start learning today. Training topics range from Android App Dev to the Xen Virtualization Platform.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Generic progress indicator 6 116
Expand data scrubbing tool 13 32
twoTwo  challenge 35 101
Unix Command -- Challenging  question 7 88
Introduction: Load and Save to file, Document-View interaction inside the SDI. Continuing from the second article about sudoku.   Open the project in visual studio. From the class view select CSudokuDoc and double click to open the header …
If you use Adobe Reader X it is possible you can't open OLE PDF documents in the standard. The reason is the 'save box mode' in adobe reader X. Many people think the protected Mode of adobe reader x is only to stop the write access. But this fe…
This video will show you how to get GIT to work in Eclipse.   It will walk you through how to install the EGit plugin in eclipse and how to checkout an existing repository.
Email security requires an ever evolving service that stays up to date with counter-evolving threats. The Email Laundry perform Research and Development to ensure their email security service evolves faster than cyber criminals. We apply our Threat…

776 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