Java Reference
In-Depth Information
void fillOval(int x, int y, int width, int height)
ing box whose upper-left corner is at ( x , y ) and whose extents are ( width ,
height ).
void fillRect(int x, int y, int width, int height)
drawsafilledrectangleinthecurrentcolorwhoseupper-leftcornerisat( x , y )
andwhoseextentsare( width , height ),suchthattherightedgeislocatedat
x+width-1 and the bottom edge is located at y+height-1 .
State methods include the following:
void setColor(Color c) sets the current color to the
java.awt.Color instancepassedto c . Color declaresseveraluppercase/
lowercase Color constants for common colors (e.g., RED / red ,
GREEN / green ,and BLUE / blue )andconstructorsfordescribingarbitrarycol-
ors—it'sconventionaltousetheuppercasecolorconstants.Acompanion Co-
lor getColor() method returns the current color.
void setFont(Font f) setsthecurrentfonttothe java.awt.Font in-
stancepassedto f .Acompanion Font getFont() methodreturnsthecur-
rent font.
The following example demonstrates various drawing and state methods:
public void paint(Graphics g)
g.drawLine(10, 10, 20, 20);
g.setFont(new Font("Arial", Font.BOLD, 10));
g.drawString("Hello", 35, 35);
The first statement sets the current color to Color.RED and the second statement
drawsalineinthiscolorfromstartingpoint( 10 , 10 )toendingpoint( 20 , 20 ).(When
you don't specify a color before drawing, the color defaults to the component's back-
ground color, which is returned from Component 's Color getBackground()
The third statement calls Font 's Font(String name, int style, int
size) constructor to create a Font object that describes a font named Arial with
style BOLD andpointsize 10 —a point isatypographicmeasurementthat'sapproxim-
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