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May 29, 2019 01:04
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WeatherWizard Java Tutorial example without Applets
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/* | |
* Copyright (c) 1995, 2008, Oracle and/or its affiliates. All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions | |
* are met: | |
* | |
* - Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* | |
* - Redistributions in binary form must reproduce the above copyright | |
* notice, this list of conditions and the following disclaimer in the | |
* documentation and/or other materials provided with the distribution. | |
* | |
* - Neither the name of Oracle or the names of its | |
* contributors may be used to endorse or promote products derived | |
* from this software without specific prior written permission. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR | |
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
*/ | |
import java.awt.AlphaComposite; | |
import java.awt.BorderLayout; | |
import java.awt.Color; | |
import java.awt.Component; | |
import java.awt.Composite; | |
import java.awt.Dimension; | |
import java.awt.Font; | |
import java.awt.Graphics2D; | |
import java.awt.Graphics; | |
import java.awt.font.FontRenderContext; | |
import java.awt.geom.Rectangle2D; | |
import java.awt.image.BufferedImage; | |
import java.net.URL; | |
import javax.imageio.ImageIO; | |
import javax.swing.JFrame; | |
import javax.swing.JLabel; | |
import javax.swing.JPanel; | |
import javax.swing.JSlider; | |
import javax.swing.UIManager; | |
import javax.swing.event.ChangeEvent; | |
import javax.swing.event.ChangeListener; | |
public class WeatherWizard extends JPanel implements ChangeListener { | |
WeatherPainter painter; | |
public void init() { | |
/* Turn off metal's use of bold fonts */ | |
UIManager.put("swing.boldMetal", Boolean.FALSE); | |
initComponents(); | |
} | |
public static void main(String[] args) { | |
WeatherWizard ww = new WeatherWizard(); | |
ww.init(); | |
JFrame f = new JFrame("Weather Wizard"); | |
f.getContentPane().add(ww, BorderLayout.CENTER); | |
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); | |
f.setSize(450, 125); | |
f.pack(); | |
f.setVisible(true); | |
} | |
private BufferedImage loadImage(String name) { | |
String imgFileName = "images/weather-"+name+".png"; | |
URL url = WeatherWizard.class.getResource(imgFileName); | |
BufferedImage img = null; | |
try { | |
img = ImageIO.read(url); | |
} catch (Exception e) { | |
} | |
return img; | |
} | |
public void initComponents() { | |
setLayout(new BorderLayout()); | |
JPanel p = new JPanel(); | |
p.add(new JLabel("Temperature:")); | |
JSlider tempSlider = new JSlider(20, 100, 65); | |
tempSlider.setMinorTickSpacing(5); | |
tempSlider.setMajorTickSpacing(20); | |
tempSlider.setPaintTicks(true); | |
tempSlider.setPaintLabels(true); | |
tempSlider.addChangeListener(this); | |
p.add(tempSlider); | |
add("North", p); | |
painter = new WeatherPainter(); | |
painter.sun = loadImage("sun"); | |
painter.cloud = loadImage("cloud"); | |
painter.rain = loadImage("rain"); | |
painter.snow = loadImage("snow"); | |
painter.setTemperature(65); | |
p.add("Center", painter); | |
} | |
public void stateChanged(ChangeEvent e) { | |
JSlider slider = (JSlider)e.getSource(); | |
painter.setTemperature(slider.getValue()); | |
} | |
} | |
class WeatherPainter extends Component { | |
int temperature = 65; | |
String[] conditions = { "Snow", "Rain", "Cloud", "Sun"}; | |
BufferedImage snow = null; | |
BufferedImage rain = null; | |
BufferedImage cloud = null; | |
BufferedImage sun = null; | |
Color textColor = Color.yellow; | |
String condStr = ""; | |
String feels = ""; | |
Composite alpha0 = null, alpha1 = null; | |
BufferedImage img0 = null, img1 = null; | |
void setTemperature(int temp) { | |
temperature = temp; | |
repaint(); | |
} | |
public Dimension getPreferredSize(){ | |
return new Dimension(450, 125); | |
} | |
void setupText(String s1, String s2) { | |
if (temperature <= 32) { | |
textColor = Color.blue; | |
feels = "Freezing"; | |
} else if (temperature <= 50) { | |
textColor = Color.green; | |
feels = "Cold"; | |
} else if (temperature <= 65) { | |
textColor = Color.yellow; | |
feels = "Cool"; | |
} else if (temperature <= 75) { | |
textColor = Color.orange; | |
feels = "Warm"; | |
} else { | |
textColor = Color.red; | |
feels = "Hot"; | |
} | |
condStr = s1; | |
if (s2 != null) { | |
condStr += "/" + s2; | |
} | |
} | |
void setupImages(BufferedImage i0) { | |
alpha0 = null; | |
alpha1 = null; | |
img0 = i0; | |
img1 = null; | |
} | |
void setupImages(int min, int max, BufferedImage i0, BufferedImage i1) { | |
float alpha = (max-temperature)/(float)(max-min); | |
alpha0 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, alpha); | |
alpha1 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 1-alpha); | |
img0 = i0; | |
img1 = i1; | |
} | |
void setupWeatherReport() { | |
if (temperature <= 32) { | |
setupImages(snow); | |
setupText("Snow", null); | |
} else if (temperature <= 40) { | |
setupImages(32, 40, snow, rain); | |
setupText("Snow", "Rain"); | |
} else if (temperature <= 50) { | |
setupImages(rain); | |
setupText("Rain", null); | |
} else if (temperature <= 58) { | |
setupImages(50, 58, rain, cloud); | |
setupText("Rain", "Cloud"); | |
} else if (temperature <= 65) { | |
setupImages(cloud); | |
setupText("Cloud", null); | |
} else if (temperature <= 75) { | |
setupImages(65, 75, cloud, sun); | |
setupText("Cloud", "Sun"); | |
} else { | |
setupImages(sun); | |
setupText("Sun", null); | |
} | |
} | |
public void paint(Graphics g) { | |
Graphics2D g2 = (Graphics2D) g; | |
Dimension size = getSize(); | |
Composite origComposite; | |
setupWeatherReport(); | |
origComposite = g2.getComposite(); | |
if (alpha0 != null) g2.setComposite(alpha0); | |
g2.drawImage(img0, | |
0, 0, size.width, size.height, | |
0, 0, img0.getWidth(null), img0.getHeight(null), | |
null); | |
if (img1 != null) { | |
if (alpha1 != null) g2.setComposite(alpha1); | |
g2.drawImage(img1, | |
0, 0, size.width, size.height, | |
0, 0, img1.getWidth(null), img1.getHeight(null), | |
null); | |
} | |
g2.setComposite(origComposite); | |
// Freezing, Cold, Cool, Warm, Hot, | |
// Blue, Green, Yellow, Orange, Red | |
Font font = new Font("Serif", Font.PLAIN, 36); | |
g.setFont(font); | |
String tempString = feels + " " + temperature+"F"; | |
FontRenderContext frc = ((Graphics2D)g).getFontRenderContext(); | |
Rectangle2D boundsTemp = font.getStringBounds(tempString, frc); | |
Rectangle2D boundsCond = font.getStringBounds(condStr, frc); | |
int wText = Math.max((int)boundsTemp.getWidth(), (int)boundsCond.getWidth()); | |
int hText = (int)boundsTemp.getHeight() + (int)boundsCond.getHeight(); | |
int rX = (size.width-wText)/2; | |
int rY = (size.height-hText)/2; | |
g.setColor(Color.LIGHT_GRAY); | |
g2.fillRect(rX, rY, wText, hText); | |
g.setColor(textColor); | |
int xTextTemp = rX-(int)boundsTemp.getX(); | |
int yTextTemp = rY-(int)boundsTemp.getY(); | |
g.drawString(tempString, xTextTemp, yTextTemp); | |
int xTextCond = rX-(int)boundsCond.getX(); | |
int yTextCond = rY-(int)boundsCond.getY() + (int)boundsTemp.getHeight(); | |
g.drawString(condStr, xTextCond, yTextCond); | |
} | |
} |
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Modified version of the Java Graphics tutorial example WeatherWizard.java, but without Applets.
Needs the image files in a folder named
images
beside the java file, with this 4 images: