viewer-core

viewer-core

A Java Swing Panel that allows rotation, translation and zooming

The Viewer class is a JPanel that allows rotating, translating and zooming the painted objects. The actual painting is therefore delegated to the Painter interface, which receives information about the world-to-screen transformation as an AffineTransform, and may paint the the transformed elements.

The basic usage is demonstrated in the ViewerTest class, which also demonstrates some of the additional capabilities, and uses two implementations of the Painter interface to show the crucial difference between applying a transform to the Graphics2D, and applying a transform to the painted objects.

The control of the viewer is usually done with MouseListeners, MouseMotionListeners and MouseWheelListeners. Default implementations (for default controls) are summarized in the MouseControls class, which can conveniently be attached to the viewer.

Changes

0.X.X :

• ...

0.1.1 :

• The default MouseControl now allows rotation and translation only when no modifier (SHIFT, ALT, ALT-GR or CTRL) is pressed. This allows adding specific functionality for the cases where these modifiers are pressed.

0.1.0 :

• Project restructuring, combining the different viewer libraries

0.0.3 :

• Replaced GeomUtils class with dependency to de.javagl:geom:0.0.1
• Added zoom limiting in Viewer to prevent rendering errors for very large or very small zooming factors
• Added the painters package, containing default Painter implementations
• Added methods in the Painters class to create transformed and composed Painter instances.

0.0.2 :

• Added convenience methods in viewer
• Handled the case that the state of maintaining the aspect ratio interferes with setting the world area

0.0.1 :

• Initial commit