Datalogi A 6: 13/10

Java and swing Graphics programming: Windows with menus Buttons, textfields, scroll panels etc Animations, images, Events from mouse clicks, keyboard etc. Can be quite complicated…

EmptyFrame.java import javax.swing.JFrame; public class EmptyFrame{ public static void main(String args[]){ JFrame frame=new JFrame("EmptyFrame"); frame.setSize(600,600); frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }

EmptyFrame

Add a canvas to the window public static void main(String args[]){ JFrame frame=new JFrame(); frame.setSize(600,600); frame.setTitle("DrawShapes"); frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE); JCanvas canvas = new JCanvas(); frame.add(canvas); frame.setVisible(true);.. }

Coordinate system:

drawLine(135,230,335,370)

drawOval(135,230,200,140)

What to draw on a canvas: Line Oval/ellipsis Arcs (parts of an ellipsis Rectangles Curves, quadratic, qubic, bezier Images Text

The state when drawing: Current Font Current Stroke (width of lines) Current Paint (color of areas) Current Transform (scaling, rotation, deformation of drawings) Current Composite (new items can be made partially transparent Current clipping area. (limit the area in which you can draw)

setFont(new Font("Serif",Font.BOLD,150)); drawString("(GyÑ)",50,200);

Paint canvas.setPaint(Color.red); canvas.fillRect(50,50,100,100); canvas.setPaint(Color.blue); canvas.fillOval(250,50,100,100); canvas.setPaint(Color.green); canvas.fillArc(450,50,100,100,45,270); canvas.setPaint(new GradientPaint( 50,350,Color.red,450,350,Color.blue)); canvas.fillRect(50,300,500,100);

Paint

Java swing components Windows and components

Example

JLabel A bit of text and/or an icon new JLabel(”Label 1”,new IconImage(..))

JButton A button you can press. Text and/or an image (icon)

Radiobutton and checkbox Press to select or de-select

JTextField TextField: a line where you can enter text using the keyboard.

JTextArea TextArea: a multi-line area for entering text

JSlider A slider: select a value By dragging a knob

JSpinner Select a value by stepping through a bounded range of values

JComboBox Select a value from a drop-down list

JList Select an a value or an interval of values from a list

Horizontal boxes and glue JBox.hbox(…)

Vertical box JBox.vbox(..)

Split pane, scroll pane

Borders Examples:

Making borders t1.setBorder(BorderFactory. createBevelBorder(BevelBorder.RAISED)); t2.setBorder(BorderFactory. createEtchedBorder()); t3.setBorder(BorderFactory. createMatteBorder(2,5,2,5,Color.red)); t4.setBorder(BorderFactory. createTitledBorder("My Title")); b1.setBorder(BorderFactory. createLineBorder(Color.blue,4));

Next time: events How to get information about user input.