我想知道是否有人可以帮我复制下面的屏幕截图。我想显示一个计数器，该计数器将以 20 到 100 的增量计数，将在左侧数字上加 1，然后继续以增量计数并复制..
eg:000 > 0/0/20 0/1/60
> 0/0/40 0/1/80
> 0/0/60 0/2/00
> 0/0/80 0/2/20
> 0/1/00 >>>>
> 0/1/20 0/9/80
> 0/1/40 1/0/00
ETC...
这是一个非常基本的例子。它的范围检查有很大的改进空间。
线性滚动条非常简单。最后，我使用了与圆形滚动条相同的基本概念，简单地创建一个BufferedImage带有所有标记的值，并根据该值计算适当的布局位置。
圆形卷轴需要更长的时间才能实现。最终结果非常基本，问题在于计算欠值和溢出值。
圆形滚动简单创建BufferedImage所有可用值。根据它的显示位置，我们要么在它之前或之后绘制另一个副本，以产生流动的错觉......
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.BufferedImage;
import javax.swing.BoundedRangeModel;
import javax.swing.DefaultBoundedRangeModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.LineBorder;
public class Altimiter {
public static void main(String[] args) {
new Altimiter();
}
public Altimiter() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private AltPane altPane;
public TestPane() {
JButton up = new JButton("+");
JButton down = new JButton("-");
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
add(up, gbc);
gbc.gridy++;
add(down, gbc);
gbc.gridx++;
gbc.gridy = 0;
gbc.gridheight = GridBagConstraints.REMAINDER;
altPane = new AltPane();
add(altPane, gbc);
up.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
altPane.setSpeed(25);
}
});
down.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
altPane.setSpeed(-25);
}
});
altPane.setValue(0);
}
}
public class AltPane extends JPanel {
private LinearScrollerPane major;
private CircularScrollerPane minor;
private int altitude = 0;
private int direction = 0;
private Timer timer;
public AltPane() {
major = new LinearScrollerPane();
minor = new CircularScrollerPane();
major.setOpaque(false);
minor.setOpaque(false);
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.fill = GridBagConstraints.VERTICAL;
gbc.weighty = 1;
add(major, gbc);
gbc.gridx++;
add(minor, gbc);
setBorder(new LineBorder(Color.BLUE));
timer = new Timer(1000, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
altitude += direction;
if (altitude < 0) {
((Timer) e.getSource()).stop();
altitude = 0;
} else if (altitude > 20000) {
((Timer) e.getSource()).stop();
altitude = 20000;
}
System.out.println("value = " + altitude);
setValue(altitude);
}
});
timer.setRepeats(true);
timer.setCoalesce(true);
timer.setInitialDelay(0);
}
public void setSpeed(int speed) {
this.direction = speed;
timer.start();
}
public void setValue(int value) {
int hnds = value / 100;
int units = value - (hnds * 100);
if (units == 0) {
if (hnds > 0 && direction > 0) {
units = 100;
} else if (hnds > 0 && direction < 0) {
units = -1;
} else {
units = 0;
}
}
major.setValue(hnds);
minor.setValue(units);
invalidate();
repaint();
}
public int getValue() {
int ths = major.getValue();
int hnds = minor.getValue();
return (ths * 100) + hnds;
}
@Override
public void paint(Graphics g) {
super.paint(g);
Insets insets = getInsets();
int width = getWidth() - (insets.left + insets.top);
int height = getHeight() - (insets.top + insets.bottom);
g.setColor(new Color(255, 0, 0, 128));
int centerY = insets.top + (height / 2);
g.drawLine(insets.left, centerY, insets.left + width, centerY);
}
}
public class CircularScrollerPane extends JPanel {
private BufferedImage baseView;
private BoundedRangeModel model;
private float startValue = 0;
private float currentValue = 0;
private float targetValue = 0;
private int rowCount = 3;
private Timer timer;
private long startTime;
private int runTime = 1000;
public CircularScrollerPane() {
setModel(new DefaultBoundedRangeModel(0, 20, 0, 100));
timer = new Timer(40, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
long now = System.currentTimeMillis();
long diff = now - startTime;
if (diff >= runTime) {
((Timer) (e.getSource())).stop();
diff = runTime;
}
float progress = (float) diff / (float) runTime;
currentValue = calculateProgress(startValue, targetValue, progress);
repaint();
}
});
timer.setRepeats(true);
timer.setCoalesce(false);
}
public int getValue() {
return getModel().getValue();
}
public void setValue(int value) {
timer.stop();
BoundedRangeModel model = getModel();
if (value < model.getMinimum()) {
value = model.getMaximum() + (value + 1);
currentValue += model.getMaximum(); // overflow
} else if (value > model.getMaximum() - model.getExtent()) {
value = model.getMinimum() + (value - model.getMaximum());
currentValue -= model.getMaximum(); // underflow
}
startValue = currentValue;
targetValue = value;
model.setValue(value);
startTime = System.currentTimeMillis();
timer.start();
}
@Override
public Dimension getPreferredSize() {
FontMetrics fm = getFontMetrics(getFont());
return fm == null ? super.getPreferredSize() : new Dimension(fm.stringWidth("MMM"), fm.getHeight() * getRowCount());
}
public void setRowCount(int value) {
if (value != rowCount) {
int old = rowCount;
rowCount = value;
invalidate();
repaint();
firePropertyChange("rowCount", old, rowCount);
}
}
public int getRowCount() {
return rowCount;
}
public void setModel(BoundedRangeModel value) {
if (value != null) {
BoundedRangeModel old = model;
model = value;
if (model != null) {
currentValue = model.getValue();
targetValue = model.getValue();
} else {
currentValue = 0;
targetValue = 0;
}
baseView = null;
firePropertyChange("model", old, model);
}
}
public BoundedRangeModel getModel() {
return model;
}
@Override
public void invalidate() {
super.invalidate();
baseView = null;
}
public float getViewOffSet(float value) {
Font font = getFont();
FontMetrics fm = getFontMetrics(font);
int rowHeight = fm.getHeight();
int extent = model.getExtent();
int min = model.getMinimum();
int max = model.getMaximum();
int viewRange = max - min;
int ticks = viewRange / extent;
float p = value / (float) viewRange;
return ((rowHeight * ticks) * p) + ((fm.getAscent() + fm.getDescent()) / 2);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
BufferedImage masterView = getMasterView();
if (masterView != null) {
Insets insets = getInsets();
int width = getWidth() - (insets.left + insets.right);
int height = getHeight() - (insets.top + insets.bottom);
int centerY = height / 2;
FontMetrics fm = g.getFontMetrics();
int yOffset = centerY - (int) getViewOffSet(currentValue);
g.drawImage(masterView, insets.left, insets.top + yOffset, this);
// Heading image...
if (yOffset > 0) {
g.drawImage(masterView, insets.left, insets.top + yOffset - masterView.getHeight(), this);
}
// Tailing image...
if (yOffset + masterView.getHeight() < height) {
g.drawImage(masterView, insets.left, insets.top + yOffset + masterView.getHeight(), this);
}
}
}
protected String pad(int value) {
StringBuilder sb = new StringBuilder(value);
sb.ensureCapacity(3);
sb.append(value);
while (sb.length() < 3) {
sb.insert(0, "0");
}
return sb.toString();
}
protected BufferedImage getMasterView() {
if (baseView == null) {
Insets insets = getInsets();
int width = getWidth() - (insets.left + insets.right);
int height = getHeight() - (insets.top + insets.bottom);
BoundedRangeModel model = getModel();
int extent = model.getExtent();
int min = model.getMinimum();
int max = model.getMaximum();
int viewRange = max - min;
int ticks = viewRange / extent;
Font font = getFont();
FontMetrics fm = getFontMetrics(font);
baseView = new BufferedImage(width, fm.getHeight() * ticks, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = baseView.createGraphics();
g2d.setFont(font);
g2d.setColor(Color.BLACK);
int yPos = 0;
for (int index = min; index < max; index += extent) {
String value = pad(index);
g2d.drawString(value, width - fm.stringWidth(value), yPos + fm.getAscent());
yPos += fm.getHeight();
}
}
return baseView;
}
}
public class LinearScrollerPane extends JPanel {
private BufferedImage baseView;
private BoundedRangeModel model;
private float startValue = 0;
private float currentValue = 0;
private float targetValue = 0;
private int rowCount = 3;
private Timer timer;
private long startTime;
private int runTime = 1000;
public LinearScrollerPane() {
Font font = UIManager.getFont("Label.font");
setFont(font.deriveFont(Font.BOLD, font.getSize() + 4));
setModel(new DefaultBoundedRangeModel(0, 0, 0, 20));
timer = new Timer(40, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
long now = System.currentTimeMillis();
long diff = now - startTime;
if (diff >= runTime) {
((Timer) (e.getSource())).stop();
diff = runTime;
}
float progress = (float) diff / (float) runTime;
currentValue = calculateProgress(startValue, targetValue, progress);
repaint();
}
});
timer.setRepeats(true);
timer.setCoalesce(false);
}
public int getValue() {
return getModel().getValue();
}
public void setValue(int value) {
timer.stop();
BoundedRangeModel model = getModel();
if (value < model.getMinimum()) {
value = model.getMinimum();
} else if (value > model.getMaximum() - model.getExtent()) {
value = model.getMaximum() - model.getExtent();
}
startValue = currentValue;
targetValue = value;
model.setValue(value);
startTime = System.currentTimeMillis();
timer.start();
}
@Override
public Dimension getPreferredSize() {
FontMetrics fm = getFontMetrics(getFont());
return fm == null ? super.getPreferredSize() : new Dimension(fm.stringWidth("MM"), fm.getHeight() * getRowCount());
}
public void setRowCount(int value) {
if (value != rowCount) {
int old = rowCount;
rowCount = value;
invalidate();
repaint();
firePropertyChange("rowCount", old, rowCount);
}
}
public int getRowCount() {
return rowCount;
}
public void setModel(BoundedRangeModel value) {
if (value != null) {
BoundedRangeModel old = model;
model = value;
if (model != null) {
currentValue = model.getValue();
targetValue = model.getValue();
} else {
currentValue = 0;
targetValue = 0;
}
baseView = null;
firePropertyChange("model", old, model);
}
}
public BoundedRangeModel getModel() {
return model;
}
@Override
public void invalidate() {
super.invalidate();
baseView = null;
}
public float getViewOffSet(float value) {
Font font = getFont();
FontMetrics fm = getFontMetrics(font);
int rowHeight = fm.getHeight();
int min = model.getMinimum();
int max = model.getMaximum();
int viewRange = max - min;
int ticks = getTicks();
float p = value / (float) viewRange;
return ((rowHeight * ticks) * p) + ((fm.getAscent() + fm.getDescent()) / 2);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
BufferedImage masterView = getMasterView();
if (masterView != null) {
Insets insets = getInsets();
int width = getWidth() - (insets.left + insets.right);
int height = getHeight() - (insets.top + insets.bottom);
int centerY = height / 2;
FontMetrics fm = g.getFontMetrics();
int yOffset = centerY - (int) getViewOffSet(currentValue);
g.drawImage(masterView, insets.left, insets.top + yOffset, this);
}
}
protected String pad(int value) {
StringBuilder sb = new StringBuilder(value);
sb.ensureCapacity(3);
sb.append(value);
while (sb.length() < 3) {
sb.insert(0, "0");
}
return sb.toString();
}
protected int getTicks() {
BoundedRangeModel model = getModel();
int extent = model.getExtent();
int min = model.getMinimum();
int max = model.getMaximum();
int viewRange = max - min;
int ticks = viewRange;
if (extent > 0) {
ticks = viewRange / extent;
}
return ticks;
}
protected BufferedImage getMasterView() {
if (baseView == null) {
Insets insets = getInsets();
int width = getWidth() - (insets.left + insets.right);
int height = getHeight() - (insets.top + insets.bottom);
BoundedRangeModel model = getModel();
int extent = model.getExtent();
int min = model.getMinimum();
int max = model.getMaximum();
int ticks = getTicks() + 1;
Font font = getFont();
FontMetrics fm = getFontMetrics(font);
baseView = new BufferedImage(width, fm.getHeight() * ticks, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2d = baseView.createGraphics();
g2d.setFont(font);
g2d.setColor(Color.BLACK);
int yPos = 0;
for (int index = min; index < max + 1; index += Math.max(1, extent)) {
String value = String.valueOf(index);
g2d.drawString(value, width - fm.stringWidth(value), yPos + fm.getAscent());
yPos += fm.getHeight();
}
g2d.dispose();
}
return baseView;
}
}
public static float calculateProgress(float startValue, float endValue, double fraction) {
float value = 0;
float distance = endValue - startValue;
value = (float) (distance * fraction);
value += startValue;
return value;
}
}