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Graphics Programming with the Java 2D API

Nov 22, 2002

📄 Contents

␡

The Basic Java 2D Recipe
Set the Graphics2D Context...
...and Render Something
Rendering on Components
Shape Primitives
Graphics Stroking
Fill Attributes and Painting
Transparency and Compositing
Text
Clipping
Coordinate Space Transformations
Techniques for Graphical User Input
Double Buffering
Comprehensive Example: Kspace Visualization
Summary

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Java Media APIs: Cross-Platform Imaging, Media and Visualization

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Techniques for Graphical User Input

Most user interaction problems in 2D consist of determining whether the user clicked on a particular shape or text area and other forms of so-called hit testing. Two methods, Graphics2D.hit() and the Shape.contains(), are particularly useful for solving shape clicking problems. Shape.contains() can be placed in the mouseEvent methods such as mousePressed() and mouseClicked() to test if a particular shape has been selected after the desired mouse event. An example of using the contains() method is provided in Listing 3.3.

Graphics2D.hit() can be used in more or less the same fashion; however, it is necessary to pass the hit() method a rectangular area of device space in which to search for the selected object.

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