Field Trip #29

1. Creating an Event Calendar with Java By Keith Lynn Field Trip #29

2. JFrame • A JFrame is a top-level container • It can run in a stand alone program • It can contain independent panels • The JFrame has a title

3. JButton • A JButton is a component that we can place on a JFrame • It is a push button • We can place a label in the button • A JButton has a margin. If the label won't display, we can obtain the insets of the button and change the margin

4. JTextComponent • In order to get input from the user, we will use a JtextField • A JtextField is a JtextComponent • It is a box on the screen • We can retrieve the text in a box with the method getText()

5. iText • We will use a third party library called iText • iText was written by Bruno Lowagie • It allows us to directly create PDF documents • We begin with creating a Document object and then a PdfWriter • The PdfWriter is created using the Document and a FileOutputStream attached to a file • After we have completed the document, we need to save it

6. PdfContentByte • There are many things we can place in a PDF document • One way of adding content is to draw directly on it • In order to do this, we obtain the PdfContentByte of the document • We use the method getDirectContent on the PdfWriter

7. Finding Days of Month • We make use of the Calendar class • The Calendar class is found in the java.util package • When we create a Calendar object, we will set the year, month, and day of the month the user specified • Then using the field DAY_OF_WEEK, we can determine where the current day falls • We can then fill in the numbers of the month

8. Drawing a Grid • In order to draw the grid on the screen, we will use the PdfContentByte • To create a line on the screen, we move to a certain location with the moveTo method • Then we move to another location with the lineTo method • After we have moved to all the locations, we call the method stroke • Repeating this, we can draw a rectangle

9. Displaying Event • We will make use of arrays in this app • An array is a collection of elements of the same type • The array we will create will contain objects that contain information about the current day of the week • In particular, we will include whatever event the user entered

10. Displaying the Month • After we have created the object representing the days of the week and the events, we use the method setTextMatrix to hold text • We can change the font • We can change the color • We can change the font using a BaseFont • We can change the color using a BaseColor • After the events are displayed, we can save the document

11. The Calendar