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The name of the program
The name of this program is Svg21a . You can see that name on the line following the word class in Listing 2 . You can use just about any name you want as long as the first character is a letter and the remainder of the namecontains only letters and numbers. However, the name of the program, as shown in Listing 2 , must match the name of the file containing that program except that the file name must have an extension of .java.
For example, this program named Svg21a is stored in a file named Svg21a.java .
Also be aware that everything in Java, including program names and file names, is case sensitive. By that I mean that Joe is not the same as jOe, which is notthe same as joE.
The next code fragment is shown at the top of Listing 3 . This fragment contains two Java programming statements.
(Usually Java program statements end with a semicolon.)
These must be the first two statements in your Java program and they must appear only once.
The first statement, down to the semicolon, creates the canvas on which the drawing will appear. You may modify this statement as explained below.
The second statement at the bottom of Listing 3 is a housekeeping statement and must not be modified.
| Listing 3 . Create a drawing canvas. |
|---|
//ONLY THE CODE BELOW THIS LINE CAN BE MODIFIED//CREATE A DRAWING CANVAS
//This must be the first statement that you write in// the program and it must appear only once.
//The following statement creates a canvas that is// 8.5x11 inches in size in a landscape layout.
Element svg = SvgLib21.makeSvg(ns,"Document Title",
11, //width8.5 //height
);//DO NOT MODIFY THE FOLLOWING STATEMENT//This statement must immediately follow the call to
// the makeSvg method above and this statement MUST// NOT BE MODIFIED.
Document doc = new Document(svg,docType); |
What does this code mean?
The first statement shown in Listing 3 creates a canvas that is 8.5 x 11 inches in size in a landscape layout. In other words, the canvas hasa width of 11 inches and a height of 8.5 inches. When you print the drawing produced on this canvas, it should fit perfectly on 8.5x11 inch paper providedthat you tell the printer to print in landscape (as opposed to portrait) mode.
If your printer uses 8.5 x 11 inch paper, the only modification that you will want to make to this statement is to sometimes reverse the order of thewidth and height values (see the comments) to cause the canvas to accommodate portrait mode.
If your printer uses larger paper, you might want to modify the width and height values to accommodate the actual size of your printer paper.
When modifying the width and height values in the first statement, be careful not to delete the comma and DON'T MAKE ANY OTHER CHANGES to thestatement with the possible exception of the "Document Title" parameter discussed below.
The Document Title
The makeSvg method, and most of the other makeZzz methods discussed below have a parameter that adds a title to the SVG element. These parameters have default values in this program such as"Document Title", "line", "rectangle", "circle", "ellipse", "polyline", and "polygon".
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