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好的，这是我的代码。 包mypanal;在jframe上绘制后保存渐变色对象（JAVA）
/** * * @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;
}
}
长，我知道对不起..
但是我的继承人问题。 如果你看看程序调用渐变色来绘制它的效果，并绘制一个椭圆或长方形与2渐变颜色。然而，只要我开始绘制下一个形状，对象的颜色就会变成所选的第一种颜色。
我相信错误是在这里 公共无效的mouseReleased（的MouseEvent为arg0）{// TODO自动生成方法存根
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弄清楚如何拯救梯度颜色而不是纯色。 请帮忙。 谢谢 （如果你需要更好的解释我可以上传一些图片）
好的，所以你使用一个'String'作为你想绘制和后来解析它的表示，在一个面向对象的编程语言中......为什么不创建一个'Drawable'对象，它有一个简单的“绘画”方法，它知道如何绘画自己。当你创建它时，传入一个描述控件当前状态的'State'对象，并允许它确定它需要的信息，以便稍后重新绘制自己的内容......这样你就可以不断向内容添加内容'国家'，只有'可绘制的'关心将需要访问它...只是说... – MadProgrammer
即时通讯不太确定我明白你的建议..你能给我一个例子在代码？ – Lewmor71
花了一段时间，但我已经添加了一个我正在谈论的例子 – MadProgrammer