在jframe（JAVA）上绘制后保存渐变色对象
好的，这是我的代码。 包mypanal;
/ ** * * @author摩根 * /
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Point;
import java.awt.TextField;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.GradientPaint;
import java.awt.Graphics2D;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
import static mypanal.MyPanel.GradientBox;
public class MyPanel extends JPanel implements MouseListener,
MouseMotionListener {
static ArrayList<String> itemsDrawn;
static String shape, color, color1;
static JCheckBox fillBox, GradientBox;
public static void main(String[] args) {
JFrame frame = new JFrame("Java 2D Drawing");
frame.setSize(400, 400);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
BorderLayout borderLayout = new BorderLayout();
frame.setLayout(borderLayout);
final JPanel panel = new JPanel();
panel.setLayout(new GridLayout(0, 4, 0, 0));
JButton clear = new JButton("Clear");
panel.add(clear);
JButton undo = new JButton("Undo");
panel.add(undo);
String[] itemTypes = { "Oval", "Rectangle", "Line" };
JComboBox<String> shapeChooser = new JComboBox<>(itemTypes);
panel.add(shapeChooser);
shape = "Oval";
fillBox = new JCheckBox("Fill");
panel.add(fillBox);
String[] colors = { "Red", "Green", "Blue", "Black" };
String[] colors1= { "Red", "Green", "Blue", "Black" };
JComboBox<String> colorChooser = new JComboBox<>(colors);
JComboBox<String> colorChooser1 = new JComboBox<>(colors1);
panel.add(colorChooser);
panel.add(colorChooser1);
color = "Red";
color1 = "Blue";
GradientBox = new JCheckBox("Use Gradient");
panel.add(GradientBox);
frame.add(panel, BorderLayout.PAGE_START);
final MyPanel myPanel = new MyPanel();
frame.add(myPanel, BorderLayout.CENTER);
shapeChooser.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
JComboBox<String> cb = (JComboBox<String>) e.getSource();
shape = (String) cb.getSelectedItem();
}
});
colorChooser.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
JComboBox<String> cb = (JComboBox<String>) e.getSource();
color = (String) cb.getSelectedItem();
}
});
colorChooser1.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
JComboBox<String> cb = (JComboBox<String>) e.getSource();
color1 = (String) cb.getSelectedItem();
}
});
clear.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
itemsDrawn = new ArrayList<>();
myPanel.repaint();
}
});
undo.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
if (itemsDrawn.size() != 0) {
itemsDrawn.remove(itemsDrawn.size() - 1);
myPanel.repaint();
}
}
});
frame.setVisible(true);
}
Point start, end;
public MyPanel() {
start = end = null;
addMouseListener(this);
addMouseMotionListener(this);
itemsDrawn = new ArrayList<>();
}
@Override
public void paint(Graphics g) {
// TODO Auto-generated method stub
super.paint(g);
int counter;
String[] temp;
Graphics2D g2d = (Graphics2D)g;
GradientPaint gp;
Color color2 = null;
for (counter = 0; counter < itemsDrawn.size(); counter++) {
temp = itemsDrawn.get(counter).split(" ");
if (temp[1].equals("Red")) {
g.setColor(Color.RED);
} else if (temp[1].equals("Green")) {
g.setColor(Color.GREEN);
} else if (temp[1].equals("Blue")) {
g.setColor(Color.BLUE);
} else if (temp[1].equals("Black")) {
g.setColor(Color.BLACK);
}
if (temp[0].equals("Rectangle")) {
if (Boolean.parseBoolean(temp[6])) {
g.fillRect(
Integer.parseInt(temp[2]) > Integer
.parseInt(temp[4]) ? Integer
.parseInt(temp[4]) : Integer
.parseInt(temp[2]),
Integer.parseInt(temp[3]) > Integer
.parseInt(temp[5]) ? Integer
.parseInt(temp[5]) : Integer
.parseInt(temp[3]), Math.abs(Integer
.parseInt(temp[4])
- Integer.parseInt(temp[2])), Math
.abs(Integer.parseInt(temp[5])
- Integer.parseInt(temp[3])));
} else {
g.drawRect(
Integer.parseInt(temp[2]) > Integer
.parseInt(temp[4]) ? Integer
.parseInt(temp[4]) : Integer
.parseInt(temp[2]),
Integer.parseInt(temp[3]) > Integer
.parseInt(temp[5]) ? Integer
.parseInt(temp[5]) : Integer
.parseInt(temp[3]), Math.abs(Integer
.parseInt(temp[4])
- Integer.parseInt(temp[2])), Math
.abs(Integer.parseInt(temp[5])
- Integer.parseInt(temp[3])));
}
} else if (temp[0].equals("Oval")) {
if (Boolean.parseBoolean(temp[6])) {
g.fillOval(
Integer.parseInt(temp[2]) > Integer
.parseInt(temp[4]) ? Integer
.parseInt(temp[4]) : Integer
.parseInt(temp[2]),
Integer.parseInt(temp[3]) > Integer
.parseInt(temp[5]) ? Integer
.parseInt(temp[5]) : Integer
.parseInt(temp[3]), Math.abs(Integer
.parseInt(temp[4])
- Integer.parseInt(temp[2])), Math
.abs(Integer.parseInt(temp[5])
- Integer.parseInt(temp[3])));
} else {
g.drawOval(
Integer.parseInt(temp[2]) > Integer
.parseInt(temp[4]) ? Integer
.parseInt(temp[4]) : Integer
.parseInt(temp[2]),
Integer.parseInt(temp[3]) > Integer
.parseInt(temp[5]) ? Integer
.parseInt(temp[5]) : Integer
.parseInt(temp[3]), Math.abs(Integer
.parseInt(temp[4])
- Integer.parseInt(temp[2])), Math
.abs(Integer.parseInt(temp[5])
- Integer.parseInt(temp[3])));
}
} else if (temp[0].equals("Line")) {
g.drawLine(Integer.parseInt(temp[2]),
Integer.parseInt(temp[3]), Integer.parseInt(temp[4]),
Integer.parseInt(temp[5]));
}
}
if (start != null && end != null) {
if (color.equals("Red")) {
g.setColor(Color.RED);
} else if (color.equals("Green")) {
g.setColor(Color.GREEN);
} else if (color.equals("Blue")) {
g.setColor(Color.BLUE);
} else if (color.equals("Black")) {
g.setColor(Color.black);
}
if (start != null && end != null) {
if (color1.equals("Red")) {
color2 = Color.RED;
} else if (color1.equals("Green")) {
color2 = Color.GREEN;
} else if (color1.equals("Blue")) {
color2 = Color.BLUE;
} else if (color1.equals("Black")) {
color2 = Color.black;
}
if (shape.equals("Oval")) {
if (fillBox.isSelected()) {
if(GradientBox.isSelected()){
gp = new GradientPaint(start.x > end.x ? end.x : start.x,
start.y > end.y ? end.y : start.y,g.getColor(),
Math.abs(end.x - start.x),
Math.abs(end.y - start.y),color2);
g2d.setPaint(gp);
g2d.fillOval(start.x > end.x ? end.x : start.x,
start.y > end.y ? end.y : start.y,
Math.abs(end.x - start.x),
Math.abs(end.y - start.y));
}
else{
g.fillOval(start.x > end.x ? end.x : start.x,
start.y > end.y ? end.y : start.y,
Math.abs(end.x - start.x),
Math.abs(end.y - start.y));
}
} else {
g.drawOval(start.x > end.x ? end.x : start.x,
start.y > end.y ? end.y : start.y,
Math.abs(end.x - start.x),
Math.abs(end.y - start.y));
}
} else if (shape.equals("Rectangle")) {
if (fillBox.isSelected()) {
if(GradientBox.isSelected()){
gp = new GradientPaint(start.x > end.x ? end.x : start.x,
start.y > end.y ? end.y : start.y,g.getColor(),
Math.abs(end.x - start.x),
Math.abs(end.y - start.y),color2);
g2d.setPaint(gp);
g2d.fillRect(start.x > end.x ? end.x : start.x,
start.y > end.y ? end.y : start.y,
Math.abs(end.x - start.x),
Math.abs(end.y - start.y));
}
else{
g.fillRect(start.x > end.x ? end.x : start.x,
start.y > end.y ? end.y : start.y,
Math.abs(end.x - start.x),
Math.abs(end.y - start.y));
}
} else {
g.drawRect(start.x > end.x ? end.x : start.x,
start.y > end.y ? end.y : start.y,
Math.abs(end.x - start.x),
Math.abs(end.y - start.y));
}
} else if (shape.equals("Line")) {
g.drawLine(start.x, start.y, end.x, end.y);
}
}
}
}
@Override
public void mouseDragged(MouseEvent arg0) {
// TODO Auto-generated method stub
end = arg0.getPoint();
repaint();
}
@Override
public void mouseMoved(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub
start = arg0.getPoint();
}
@Override
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub
if (start != null && end != null) {
itemsDrawn.add(shape + " " + color + " " + start.x + " " + start.y
+ " " + end.x + " " + end.y + " " + fillBox.isSelected());
}
start = null;
end = null;
}
}
很久我知道对不起..
但继承人我的问题。 如果你看一下，程序调用要绘制的渐变颜色，它就会起作用，并用2种渐变颜色绘制一个椭圆形或矩形。 但是，一旦我开始绘制下一个形状，对象的颜色就会变为所选的第一个颜色。
我相信错误就在这里 public void mouseReleased（MouseEvent arg0）{ // TODO自动生成的方法存根
if (start != null && end != null) {
itemsDrawn.add(shape + " " + color + " " + start.x + " " + start.y
+ " " + end.x + " " + end.y + " " + fillBox.isSelected());
但我不能为我的生活找出如何保存渐变色而不是纯色。 请帮忙。 谢谢 （如果您需要图片以获得更好的解释，我可以上传一些）
1 个答案:
答案 0 :(得分：1)
不是依赖于String解析，而是实际定义可以绘制的对象及其属性。
这意味着当用户开始在表面上绘图时，您需要创建一个新的“可绘制”对象并使用所需的属性对其进行种子处理，例如......
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Cursor;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.LinearGradientPaint;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Shape;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JCheckBox;
import javax.swing.JColorChooser;
import javax.swing.JComboBox;
import javax.swing.JComponent;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.border.CompoundBorder;
import javax.swing.border.EmptyBorder;
import javax.swing.border.LineBorder;
public class MyPaint {
public static void main(String[] args) {
new MyPaint();
}
public MyPaint() {
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());
DrawablePane dp = new DrawablePane();
ControlPane cp = new ControlPane(dp);
frame.add(dp);
frame.add(cp, BorderLayout.WEST);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class State {
private final Color foreground;
private final Color background;
private final boolean gradient;
public State(Color foreground, Color background, boolean gradient) {
this.foreground = foreground;
this.background = background;
this.gradient = gradient;
}
public Color getBackground() {
return background;
}
public Color getForeground() {
return foreground;
}
public boolean isGradient() {
return gradient;
}
}
public class ControlPane extends JPanel {
private JComboBox shapes;
private JLabel foreground;
private JLabel background;
private JCheckBox gradient;
private DrawablePane drawablePane;
public ControlPane(DrawablePane pane) {
// I'd prefer to use some kind of factory, but this is just an example..
shapes = new JComboBox<>(new String[]{"Rectangle", "Oval"});
foreground = createColorLable(Color.BLACK);
foreground.setToolTipText("Foreground");
background = createColorLable(Color.WHITE);
background.setToolTipText("Background");
gradient = new JCheckBox("Gradient");
JPanel panel = new JPanel();
panel.add(foreground);
panel.add(background);
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 1;
add(shapes, gbc);
add(panel, gbc);
gbc.weighty = 1;
gbc.anchor = GridBagConstraints.NORTH;
add(gradient, gbc);
setBorder(new CompoundBorder(new LineBorder(Color.BLACK), new EmptyBorder(12, 12, 12, 12)));
this.drawablePane = pane;
MouseHandler mouseHandler = new MouseHandler();
drawablePane.addMouseListener(mouseHandler);
drawablePane.addMouseMotionListener(mouseHandler);
}
protected Drawable createDrawable() {
Drawable drawable = null;
State state = new State(foreground.getBackground(), background.getBackground(), gradient.isSelected());
String selected = (String) shapes.getSelectedItem();
if ("rectangle".equalsIgnoreCase(selected)) {
drawable = new Square(state);
} else if ("oval".equalsIgnoreCase(selected)) {
drawable = new Circle(state);
}
return drawable;
}
protected JLabel createColorLable(Color base) {
final JLabel label = new JLabel();
label.setBackground(base);
label.setBorder(new LineBorder(Color.BLACK));
label.setPreferredSize(new Dimension(25, 25));
label.setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
label.setOpaque(true);
label.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
Color color = JColorChooser.showDialog(label, "Color", label.getBackground());
if (color != null) {
label.setBackground(color);
}
}
});
return label;
}
public class MouseHandler extends MouseAdapter {
private Drawable drawable;
private Point clickPoint;
@Override
public void mousePressed(MouseEvent e) {
drawable = createDrawable();
drawable.setLocation(e.getPoint());
drawablePane.addDrawable(drawable);
clickPoint = e.getPoint();
}
@Override
public void mouseDragged(MouseEvent e) {
Point drag = e.getPoint();
Point start = clickPoint;
int maxX = Math.max(drag.x, start.x);
int maxY = Math.max(drag.y, start.y);
int minX = Math.min(drag.x, start.x);
int minY = Math.min(drag.y, start.y);
int width = maxX - minX;
int height = maxY - minY;
drawable.setLocation(new Point(minX, minY));
drawable.setSize(new Dimension(width, height));
drawablePane.repaint();
}
}
}
public interface Drawable {
public void paint(JComponent parent, Graphics2D g2d);
public void setLocation(Point location);
public void setSize(Dimension size);
public State getState();
public Rectangle getBounds();
}
public abstract class AbstractDrawable implements Drawable {
private Rectangle bounds;
private State state;
public AbstractDrawable(State state) {
bounds = new Rectangle();
this.state = state;
}
@Override
public State getState() {
return state;
}
public abstract Shape getShape();
@Override
public void setLocation(Point location) {
bounds.setLocation(location);
}
@Override
public void setSize(Dimension size) {
bounds.setSize(size);
}
@Override
public Rectangle getBounds() {
return bounds;
}
@Override
public void paint(JComponent parent, Graphics2D g2d) {
Shape shape = getShape();
State state = getState();
Rectangle bounds = getBounds();
if (state.isGradient()) {
if (bounds.width > 0 && bounds.height > 0) {
Point2D startPoint = new Point2D.Double(bounds.x, bounds.y);
Point2D endPoint = new Point2D.Double(bounds.x + bounds.width, bounds.y + bounds.height);
LinearGradientPaint gp = new LinearGradientPaint(
startPoint,
endPoint,
new float[]{0f, 1f},
new Color[]{state.getForeground(), state.getBackground()});
g2d.setPaint(gp);
g2d.fill(shape);
}
} else {
g2d.setPaint(state.getBackground());
g2d.fill(shape);
g2d.setPaint(state.getForeground());
g2d.draw(shape);
}
}
}
public class Square extends AbstractDrawable {
public Square(State state) {
super(state);
}
@Override
public Shape getShape() {
return getBounds();
}
}
public class Circle extends AbstractDrawable {
public Circle(State state) {
super(state);
}
@Override
public Shape getShape() {
Rectangle bounds = getBounds();
return new Ellipse2D.Float(bounds.x, bounds.y, bounds.width, bounds.height);
}
}
public class DrawablePane extends JPanel {
private List<Drawable> itemsDrawn;
public DrawablePane() {
itemsDrawn = new ArrayList<>();
}
@Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
for (Drawable d : itemsDrawn) {
d.paint(this, g2d);
}
g2d.dispose();
}
public void addDrawable(Drawable drawable) {
itemsDrawn.add(drawable);
repaint();
}
}
}
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