1 / 7

Intro to Graphics in Java: Drawing Shapes, Lines, and Text

Learn how to draw shapes, lines, and text using Java's Graphics class. Explore different methods and create your own creative drawings. Step-by-step instructions provided.

poteet
Download Presentation

Intro to Graphics in Java: Drawing Shapes, Lines, and Text

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Please open JCreator and follow these steps: • Configure  Options • JDK Tools • Choose Run Applet from drop-down • Click Default, then Edit • Click the 3 dots next to the Command box, then go to D Drive (Temp Local Storage)  Java software  jdk1.7.0_45 bin, then double-click appletviewer. • OK, then Apply, then OK

  2. Intro to Graphics • Graphics are often created using an applet • An applet is simply a Java program that is embedded in an HTML document, and (usually) is designed to be Web-accessible • You must compile an applet file before embedding it in an HTML file (the HTML file only takes the bytecode, which can then be run using any browser – this is one of Java’s major advantages over other languages) • Applet files… • Have no main • Import 2 or more packages • Must extend the class called Applet • Once embedded, can be viewed with a browser or appletviewer

  3. To draw graphics, define the paint method that is inherited from Applet • The paint method accepts one parameter, of type Graphics • Using the Graphics object, you can draw using methods such as drawRect( ), drawOval( ), drawLine( ), etc. • Java uses an xy-coordinate system, with the top-left corner being the origin (0,0) • When drawing shapes, you pass parameters specifying where to begin the shape, and how far to draw it. • Example: page.drawRect(100,100,80,50) /* draws a rectangle starting at (100,100) and with length=80 and height=50. page is the Graphics object */ • Demo….GraphicsDemo

  4. To draw a line: drawLine(startX,startY,endX,endY) // note how this is different from rectangles! • Demo… • To draw an oval, you specify the dimensions of its bounding rectangle, the rectangle that it would fit into • To draw a circle: the bounding rectangle must have equal sides (a square) • Demo… • To draw an arc (part of a circle): like drawing an oval, but also give the starting angle and the measure of the angle • Demo…

  5. To write text: drawString(String,x,y) // x,y is bottom left with Strings!! • Demo…. • The Color class has a bunch of predefined colors, such as Color.yellow and Color.red • You can set the background by simply typing setBackground(Color), but to set a shape’s color, you must use the Graphics object (i.e. page.setColor(Color.Blue) ) • Demo: Snowman

  6. When creating the HTML documents for your assignments, it is easiest to create a New HTML Document, then copy the code from Graphics.html, then change the “______.class” and the width and height. • Very important – you must save your .java and .html files in the same folder!

  7. Assignments • Make sure you save all graphics assignments in your Unit 5 Assignments folder. • P. 118 # 14 (call it P118num14) • P. 118 # 15 • (Drawing1) Create a drawing of your own – be creative, and experiment with all of the methods of the Graphics class that we learned.

More Related