Class DrawingPanel. Public final class DrawingPanel extends Object implements ImageObserver DrawingPanel is a simplified Java drawing window class to accompany Building Java Programs textbook and associated materials. Authors: Marty Stepp (Stanford University) and Stuart Reges (University of Washington).

Java and the Mac OS X Terminal

This page is obsolete.

This document instructs you on how to use the Mac OS X Terminal with Java.

Java

You will use the Java compiler javac to compile your Java programs andthe Java interpreter java to run them.To verify that Apple's implementation of Java 2 Standard Edition (Java SE 6) isalready installed:

• Run Software Update.
• Run Applications/Utilities/Java/Java Preferencesand verify that the Java SE 6 - 64-bit entry is checked andfirst in the list; if not, drag to change the preferred order.

Command-line interface

You will type commands in an application called the Terminal.

• Open a terminal window. You can find this underGo -> Applications -> Utilities. Drag the Terminal to your dock sinceyou will be using it frequently.
• You should now have a Terminal window somewhere on the screen.It will have a prompt that looks something like:

  To check that you are running the right version of Java, typethe commands in boldface below. You should see something similar to the information printed below. The importantpart is that it says 1.6 or 1.5 (and not 1.4).

  Then type

  Since you will be using the Terminal frequently, you may want tocustomize the default window settings (e.g., Monaco 13pt font with antialiasing).

Compile the program

You will use the javac command to convert your Java program into a form moreamenable for execution on a computer.

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• From the Terminal, navigate to the directory containing your .javafiles, say ~wayne/introcs/hello, by typing the cd commandbelow.

  Assuming the file, say HelloWorld.java is in the currentworking directory, type the javac command below to compile it.

  If everything went well, you should see no error messages.

Execute the program

You will use the java command to execute your program.

• From the Terminal, type the java command below.If all goes well, you should see the output of the program -Hello, World.

Input and Output

If your program gets stuck in an infinite loop, type Ctrl-c to break out.

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If you are entering input from the keyboard, you can signifyto your program that there is no more data by typingCtrl-d for EOF (end of file).You should type this character on its own line.

Troubleshooting

When I try to run java I get: Exception in thread 'main' java.lang.NoClassDefFoundError.First, be sure that HelloWorld.class is in the current directory.Be sure to type java HelloWorld without a trailing .classor .java.If this was not your problem, it's possiblethat your CLASSPATH was set by some other program so that it no longerincludes the current working directory.Try running your program with the command line

If this works, your classpath is set incorrectly.

I get the error 'class file has wrong version 50.0, should be 49.0' when I compilefrom the Terminal. What does this mean?It's probably because DrJava is configured to use Java 6.0 and and your Terminal is configured to use Java 5.0.To change the default version of Java in your Terminal, launchJava Preferencest. Drag the Java SE 6 - 64-bit entryto appear first.

How do I get the menu to display at the topof the screen instead of at the top of the frame?Execute with java -Dapple.laf.useScreenMenuBar=true

Where can I learn more about the command line?Here is a short tutorial on thecommand-line.

You already know how to create different geometric primitives and more complicated shapes. This lesson teaches how to add some color and fancy outlines to your graphics and represents filling and stroking:

• Filling – is a process of painting the shape’s interior with solid color or a color gradient, or a texture pattern
• Stroking – is a process of drawing a shape’s outline applying stroke width, line style, and color attribute

To apply fancy line styles and fill patterns to geometric primitives change the stroke and paint attributes in the Graphics2D context before rendering. For example, draw a dashed line by creating an appropriate Stroke object. To add this stroke to the Graphics2D context before you render the line call the setStroke method. Similarly, you apply a gradient fill to a Shape object by creating a GradientPaint object and adding it to the Graphics2D context.

The following code lines enrich geometric primitives with filling and stroking context:

The ShapesDemo2D.java code example represents additional implementations of stoking and filling.

Defining Fancy Line Styles and Fill Patterns

Using the Java 2D Stroke and Paint classes, you can define fancy line styles and fill patterns.

Line Styles

Line styles are defined by the stroke attribute in the Graphics2D rendering context. To set the stroke attribute, you create a BasicStroke object and pass it into the Graphics2DsetStroke method.

A BasicStroke object holds information about the line width, join style, end-cap style, and dash style. This information is used when a Shape is rendered with the draw method.

The line width is the thickness of the line measured perpendicular to its trajectory. The line width is specified as a float value in user coordinate units, which are roughly equivalent to 1/72 of an inch when the default transform is used.

The join style is the decoration that is applied where two line segments meet. BasicStroke supports the following three join styles:

JOIN_BEVEL

JOIN_MITER

JOIN_ROUND

The end-cap style is the decoration that is applied where a line segment ends. BasicStroke supports the following three end-cap styles:

CAP_BUTT

CAP_ROUND

CAP_SQUARE

The dash style defines the pattern of opaque and transparent sections applied along the length of the line. The dash style is defined by a dash array and a dash phase. The dash array defines the dash pattern. Alternating elements in the array represent the dash length and the length of the space between dashes in user coordinate units. Element 0 represents the first dash, element 1 the first space, and so on. The dash phase is an offset into the dash pattern, also specified in user coordinate units. The dash phase indicates what part of the dash pattern is applied to the beginning of the line.

Fill Patterns

Fill patterns are defined by the paint attribute in the Graphics2D rendering context. To set the paint attribute, you create an instance of an object that implements the Paint interface and pass it into the Graphics2DsetPaint method.

The following three classes implement the Paint interface: Color, GradientPaint, and TexturePaint.

To create a GradientPaint, you specify a beginning position and color and an ending position and color. The gradient changes proportionally from one color to the other color along the line connecting the two positions. For example:

The pattern for a TexturePaint class is defined by a BufferedImage class. To create a TexturePaint object, you specify the image that contains the pattern and a rectangle that is used to replicate and anchor the pattern. The following image represents this feature: