import javax.swing.JApplet;
import java.awt.*;
public class Snowman extends JApplet {
//---------------------------------------------
// Draws a snowman.
//---------------------------------------------
public void paint (Graphics page)
{
final int MID = 150;
final int TOP = 50;
setBackground (Color.cyan);
page.setColor(Color.blue);
page.fillRect(0, 175, 300, 50); // ground
page.setColor (Color.yellow);
page.fillOval (-40, -40, 80, 80); // sun
page.setColor (Color.white);
page.fillOval (MID-20, TOP, 40, 40); // head
page.fillOval (MID-35, TOP+35, 70, 50); // upper torso
page.fillOval (MID-50, TOP+80, 100, 60); // lower torso
page.setColor (Color.black);
page.fillOval(MID-10, TOP+10, 5, 5);
page.fillOval(MID+5, TOP+10, 5, 5);
page.drawArc(MID-10, TOP+20, 20, 10, 190, 160); // smile
page.drawLine (MID-25, TOP+60, MID-50, TOP+40); // left arm
page.drawLine (MID+25, TOP+60, MID+55, TOP+60); // right arm
page.drawLine (MID-20, TOP+5, MID+20, TOP+5); // brim of hat
page.fillRect(MID-15, TOP-20, 30, 25); // top of hat
}
}
This is all the code. The setBackground is stated after I declare the two final variables, thanks in advance, I got this code from a book, "Java Software Solutions", I looked over it over and over, and no luck :/ thanks in advance :)
//<applet code='Snowman' width=300 height=200></applet>
import javax.swing.*;
import java.awt.*;
public class Snowman extends JApplet {
//---------------------------------------------
// Draws a snowman.
//---------------------------------------------
public void init() {
add(new SnowmanPanel());
validate();
}
}
class SnowmanPanel extends JPanel {
final int MID = 150;
final int TOP = 50;
SnowmanPanel() {
setBackground (Color.cyan);
}
public void paintComponent(Graphics page)
{
super.paintComponent(page);
page.setColor(Color.blue);
page.fillRect(0, 175, 300, 50); // ground
page.setColor (Color.yellow);
page.fillOval (-40, -40, 80, 80); // sun
page.setColor (Color.white);
page.fillOval (MID-20, TOP, 40, 40); // head
page.fillOval (MID-35, TOP+35, 70, 50); // upper torso
page.fillOval (MID-50, TOP+80, 100, 60); // lower torso
page.setColor (Color.black);
page.fillOval(MID-10, TOP+10, 5, 5);
page.fillOval(MID+5, TOP+10, 5, 5);
page.drawArc(MID-10, TOP+20, 20, 10, 190, 160); // smile
page.drawLine (MID-25, TOP+60, MID-50, TOP+40); // left arm
page.drawLine (MID+25, TOP+60, MID+55, TOP+60); // right arm
page.drawLine (MID-20, TOP+5, MID+20, TOP+5); // brim of hat
page.fillRect(MID-15, TOP-20, 30, 25); // top of hat
}
}
JPanel
or JComponent
and paint there. For custom painting in the latter, override paintComponent(Graphics)
super.paintComponent(Graphics)
init()
) rather than in the paint method. BufferedImage
and put the image in an ImageIcon
in a JLabel
. Which is simpler. Try this code
import java.awt.*;
import javax.swing.JApplet;
public class SnowMan extends JApplet
{
public SnowMan()
{
setBackground(Color.cyan);
}
//---------------------------------------------
// Draws a snowman.
//---------------------------------------------
@Override
public void paint(Graphics page)
{
final int MID = 150;
final int TOP = 50;
page.setColor(Color.blue);
page.fillRect(0, 175, 300, 50); // ground
page.setColor(Color.yellow);
page.fillOval(-40, -40, 80, 80); // sun
page.setColor(Color.white);
page.fillOval(MID - 20, TOP, 40, 40); // head
page.fillOval(MID - 35, TOP + 35, 70, 50); // upper torso
page.fillOval(MID - 50, TOP + 80, 100, 60); // lower torso
page.setColor(Color.black);
page.fillOval(MID - 10, TOP + 10, 5, 5);
page.fillOval(MID + 5, TOP + 10, 5, 5);
page.drawArc(MID - 10, TOP + 20, 20, 10, 190, 160); // smile
page.drawLine(MID - 25, TOP + 60, MID - 50, TOP + 40); // left arm
page.drawLine(MID + 25, TOP + 60, MID + 55, TOP + 60); // right arm
page.drawLine(MID - 20, TOP + 5, MID + 20, TOP + 5); // brim of hat
page.fillRect(MID - 15, TOP - 20, 30, 25); // top of hat
}
}
setBackground (Color.cyan);
It is working properly in my IDE. I also changed the color of background.It works nice and properly. No need to change the code.Make sure when you are creating the class.
The paint(Graphics)
method is used only to paint the parameter (in your case page
). The application applet background color has already been processed by this stage.
That is why you can fix the problem by setting it in the constructor:
public Snowman()
{
this.setBackground(Color.cyan);
}
我认为你需要使用,getContentPane()。setBackground()
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