Displaying Graphics in Applet
java.awt.Graphics class provides many methods for graphics programming.
To display graphics in an applet, you can use the Graphics class. The Graphics class provides methods for drawing lines, shapes, images, and text on a canvas.
Here is an example of an applet that displays a rectangle and an oval:
javaimport java.applet.Applet;
import java.awt.Graphics;
public class MyGraphicsApplet extends Applet {
public void paint(Graphics g) {
g.drawRect(10, 10, 50, 50);
g.drawOval(70, 70, 50, 50);
}
}
In this example, the MyGraphicsApplet class extends the Applet class and overrides the paint() method to draw a rectangle using the drawRect() method and an oval using the drawOval() method.
The drawRect() method takes four arguments: the x and y coordinates of the top-left corner of the rectangle, and its width and height. The drawOval() method takes four arguments: the x and y coordinates of the top-left corner of the bounding rectangle of the oval, and its width and height.
You can also draw lines using the drawLine() method:
javag.drawLine(10, 10, 50, 50);
In this example, the drawLine() method takes four arguments: the x and y coordinates of the starting point of the line, and the x and y coordinates of the ending point of the line.
To draw text, you can use the drawString() method:
javag.drawString("Hello, world!", 10, 10);
In this example, the drawString() method takes three arguments: the text to be drawn, and the x and y coordinates of the starting point of the text.
There are many other methods available in the Graphics class for drawing shapes, images, and text. You can also set the color, font, and other properties of the graphics context using the methods of the Graphics class.
Commonly used methods of Graphics class:
- public abstract void drawString(String str, int x, int y): is used to draw the specified string.
- public void drawRect(int x, int y, int width, int height): draws a rectangle with the specified width and height.
- public abstract void fillRect(int x, int y, int width, int height): is used to fill rectangle with the default color and specified width and height.
- public abstract void drawOval(int x, int y, int width, int height): is used to draw oval with the specified width and height.
- public abstract void fillOval(int x, int y, int width, int height): is used to fill oval with the default color and specified width and height.
- public abstract void drawLine(int x1, int y1, int x2, int y2): is used to draw line between the points(x1, y1) and (x2, y2).
- public abstract boolean drawImage(Image img, int x, int y, ImageObserver observer): is used draw the specified image.
- public abstract void drawArc(int x, int y, int width, int height, int startAngle, int arcAngle): is used draw a circular or elliptical arc.
- public abstract void fillArc(int x, int y, int width, int height, int startAngle, int arcAngle): is used to fill a circular or elliptical arc.
- public abstract void setColor(Color c): is used to set the graphics current color to the specified color.
- public abstract void setFont(Font font): is used to set the graphics current font to the specified font.