Hi !
Featured games (90)
games approved by the League of Dukes
Games in Showcase (725)
Games in Android Showcase (216)
games submitted by our members
Games in WIP (791)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  Zoom on mouse  (Read 1114 times)
0 Members and 1 Guest are viewing this topic.
Offline cborders

Junior Devvie

« Posted 2005-11-09 20:44:57 »

Ok, here's what I am trying to accomplish.  Have you seen those applications that zoom around the mouse?  AutoCAD is a really good example.  The page doesn't center on the mouse but the pointer is the focal point for the zooming action.  I have a program that displays map data on and AWTGLCanvas and I need to implement that same kind of thing.  Here is my idea (feel free to shoot this idea down (In fact please do there has got to be a better way)):

1. Get the mouse location from the MouseEvent
2. Translate that to world coords
3. Zoom
4. Get the new screen coords of where the mouse had been pointing
5. Adjust to reconcile the difference vetween the two sets of screen coords

Now in pseudo-code:
Do you think that'll work?
oldX = mouseEvent.getX();
oldY = mouseEvent.getY();
gluUnProject((float)oldX, (float)oldY, zoomLevel, modelArray, projectionArray, viewportArray, result);
worldX = result[0];
worldY = result[1];
gluProject(worldX, worldY, zoomLevel,  modelArray, projectionArray, viewportArray, result);
newX = result[0];
newY = result[1];
pan(newX - oldX, newY - oldY);
Pages: [1]
  ignore  |  Print  
You cannot reply to this message, because it is very, very old.

Archive (54 views)
2017-04-27 17:45:51

buddyBro (266 views)
2017-04-05 03:38:00

CopyableCougar4 (689 views)
2017-03-24 15:39:42

theagentd (691 views)
2017-03-24 15:32:08

Rule (734 views)
2017-03-19 12:43:22

Rule (709 views)
2017-03-19 12:42:17

Rule (713 views)
2017-03-19 12:36:21

theagentd (723 views)
2017-03-16 05:07:07

theagentd (656 views)
2017-03-15 22:37:06

theagentd (497 views)
2017-03-15 22:32:18
List of Learning Resources
by elect
2017-03-13 14:05:44

List of Learning Resources
by elect
2017-03-13 14:04:45

SF/X Libraries
by philfrei
2017-03-02 08:45:19

SF/X Libraries
by philfrei
2017-03-02 08:44:05

SF/X Libraries
by SkyAphid
2017-03-02 06:38:56

SF/X Libraries
by SkyAphid
2017-03-02 06:38:32

SF/X Libraries
by SkyAphid
2017-03-02 06:38:05

SF/X Libraries
by SkyAphid
2017-03-02 06:37:51 is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!