introduction to java simple graphics. objects and methods recall that a method is an action which...

Introduction to Java Simple Graphics

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Introduction to Java

Simple Graphics

Objects and Methods

• Recall that a method is an action which can be performed by an object.– The action takes place as the result of a method

call also known a a method invocation.– The calling objects calls or invokes the method.

• In this section, we’ll name our object canvas and we’ll use it to draw figures inside an applet display.

Page 3: Introduction to Java Simple Graphics. Objects and Methods Recall that a method is an action which can be performed by an object. –The action takes place

A Sample Graphics Applet• class HappyFace (page 34)

Page 4: Introduction to Java Simple Graphics. Objects and Methods Recall that a method is an action which can be performed by an object. –The action takes place

A Sample Graphics Applet, cont.

• The paint method specifies what is drawn in the applet.

• The paint method is invoked automatically when the applet is run.

Page 5: Introduction to Java Simple Graphics. Objects and Methods Recall that a method is an action which can be performed by an object. –The action takes place

Drawing Ovals and Circles

• The drawOval method draws only the outline of the oval.

canvas.drawOval(100, 50, 90, 50);• The fillOval method draws a filled-in oval.

canvas.fillOval(100, 50, 90, 50);

Page 6: Introduction to Java Simple Graphics. Objects and Methods Recall that a method is an action which can be performed by an object. –The action takes place

Drawing Ovals and Circles, cont.

• The drawOval and fillOval methods take four arguments.– The first two arguments indicate the upper-left

corner of an invisible rectangle around the oval.– The last two arguments indicate the width and

height of the oval.

• A circle is just an oval whose height is the same as its width.

Page 7: Introduction to Java Simple Graphics. Objects and Methods Recall that a method is an action which can be performed by an object. –The action takes place

Size and Positions of Figures

• Sizes and positions in a Java applet are given in pixels.

• Think of the display surface for the applet as being a two-dimensional grid of individual pixels.

Page 8: Introduction to Java Simple Graphics. Objects and Methods Recall that a method is an action which can be performed by an object. –The action takes place

Screen Coordinate System

Page 9: Introduction to Java Simple Graphics. Objects and Methods Recall that a method is an action which can be performed by an object. –The action takes place

Screen Coordinate System, cont.

• The x-coordinate the the number of pixels from the left.

• The y-coordinate is the number of pixels from the top (not from the bottom).

Page 10: Introduction to Java Simple Graphics. Objects and Methods Recall that a method is an action which can be performed by an object. –The action takes place

Drawing Arcs

• The drawArc method draws an arc. drawArc(100, 50, 200, 200, 180, 180);

• The drawArc method takes six arguments.– The first four arguments are the same as the four

arguments needed by the drawOval method.– The last two arguments indicate where the arc

starts, and the number of degrees through which is sweeps.

– 0 degrees is horizontal and to the right.

Page 11: Introduction to Java Simple Graphics. Objects and Methods Recall that a method is an action which can be performed by an object. –The action takes place

Specifying an Arc

Page 12: Introduction to Java Simple Graphics. Objects and Methods Recall that a method is an action which can be performed by an object. –The action takes place

Running and Closing an Applet

• There are two ways to run an applet:– embed the applet in a Web site and run it– use an applet viewer from the IDE.

• There are two corresponding ways to end an applet:– if you are running the applet from a Web site,

close the page or navigate away from the page– if you are using an applet viewer, use the mouse

to click the close-window button.

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