THE "Pen" INTERFACE NAMES LIKE "clearRect" and "fillRect" ENABLE YOUR APPLET TO TELL THE BROWSER WHAT TO DO. THESE ARE ALSO "METHOD" NAMES. THE METHODS ARE PROVIDED BY THE BROWSER SO THEY ARE NOT DESCRIBED IN YOUR JAVA CODE. THE METHODS THAT CAN BE USED ARE PRESPECIFIED. clearRect,fillRect,drawString,clearString,drawLine,... THE PARAMETERS THAT MAY OR MUST BE INCLUDED ARE ALSO FIXED. "clearRect" EXPECTS EITHER A SET OF FOUR COORDINATES SPECIFYING THE BOUNDARY OF A RECTANGLE OR NOTHING.

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This page is part of a section of lecture slides related to " Basics of Java Graphics " within the topic "Java -- Executable Web Content". Other slides within this section and other sections of slides for the topic "Java -- Executable Web Content" can be accessed using the links below. Limitations of the Client/Server Model THE CLIENT/SERVER MODEL LIMITS THE WEB FORMS PROVIDE LIMITED INTERACTIVITY How Applets Fit ACTIVE DOCUMENTS JAVA Applet Structure APPLET STRUCTURE METHOD STRUCTURE METHOD PARAMETERS Event Handling THE "EVENT" INTERFACE Basics of Java Graphics IDENTIFYING PIXELS THE "Pen" INTERFACE GRAPHIC PRIMITIVES DRAWING TEXT OPTIONAL PARAMETERS LINE DRAWING Shape Drawing Methods SHAPE DRAWING SHAPE DRAWING (cont.) CLEAR METHODS DRAWING + CLEARING = INVERSION Specifying Colors User Interface Components User Interface Components Component Constructors The Slider Constructor Method The Slider Constructor Method (cont.) Variables Naming Components Instance Variable Names Associating Names with Components Component Layout Management Adding Components to the Display The Layout Manager Event Handlers for Components Component Event Handlers THE scroll METHOD COMPONENT ACCESS METHODS THE SLIDER getValue METHOD More on Methods PUBLIC VS. PRIVATE PRIVATE METHODS VOID vs. NON-VOID METHODS FUNCTIONS