ADVANCED GUIS AND GRAPHICS - Java Programming: From Problem Analysis to Program Design - page 800

class Graphics
This section presents a glimpse of the class Graphics , which is contained in the
package java.awt . The class Graphics provides methods for drawing items such
as lines, ovals, and rectangles on the screen. Some methods of the class Graphics draw
shapes; others draw bitmap images. This class also contains methods to set the properties
of graphic elements including fonts and colors. Table 12-7 shows some of the construc-
tors and methods of the class Graphics .
TABLE 12-7 Some Constructors and Methods of the class Graphics
protected Graphics()
//Constructs a Graphics object that defines a context in which the
//user can draw. This constructor cannot be called directly.
public void draw3DRect( int x, int y, int w, int h, boolean t)
//Draws a 3D rectangle at (x, y) of the width w and height h. If t is
//true, the rectangle will appear raised.
public abstract void drawArc( int x, int y, int w, int h,
int sangle, int aangle)
//Draws an arc in the rectangle at the position (x, y) of width w
//and height h. The arc starts at the angle sangle with an arc angle
//aangle. Both angles are measured in degrees.
public abstract boolean drawImage(Image img, int xs1, int ys1,
int xs2, int ys2, int xd1, int yd1,
int xd2, int yd2, Color c, ImageObserver ob)
//Draws the image specified by img from the area defined by the
//bounding rectangle, (xs1, ys1) to (xs2, ys2), in the area defined
//by the rectangle (xd1, yd1) to (xd2, yd2). Any transparent color
//pixels are drawn in the color c. The ob monitors the progress of
//the image.
public abstract void drawLine( int xs, int ys, int xd, int yd)
//Draws a line from (xs, ys) to (xd, yd).
public abstract void drawOval( int x, int y, int w, int h)
//Draws an oval at the position (x, y) of width w and height h.
public abstract void drawPolygon( int [] x, int [] y, int num)
//Draws a polygon with the points (x[0], y[0]), ...,
//(x[num - 1], y[num - 1]). Here num is the number of points in
//the polygon.
public abstract void drawPolygon(Polygon poly)
//Draws a polygon as defined by the object poly.
public abstract void drawRect( int x, int y, int w, int h)
//Draws a rectangle at the position (x, y) of width w and
//height h.