我正在使用 java 图形制作声速曲线图。我绘制了静态图（运行程序时弹出的图），但我正在尝试实现它，如果用户单击 x 或 y 轴，那么它将放大以便您查看声速剖面更接近。我还没有图表中的声速曲线（我已经知道如何做到这一点，我只是节省了绘制它的努力，直到我弄清楚了缩放功能）。有没有人对如何使这项工作有任何想法？我见过有人尝试将仿射变换用于类似的任务，但我不确定这是正确的做法，或者我是否正确地执行此操作。要查看的特定代码是paint()、zoomIn() 和mouseClicked() 方法。想法将不胜感激！
public class SoundSpeedProfile extends JPanel implements MouseListener, ActionListener {
private String title;
private String subTitle;
private JFrame frame;
private Graphics g;
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/**Draws the sound speed profile and surrounding graphics
* @param Graphics g - graphics object
*/
public void paint(Graphics g){
this.g = g;
super.paint(g); //the super knows how to draw "standard" components like squares, rectangles, circles, etc
g.setColor(Color.DARK_GRAY);
//1) Set up the graph the sound speed profile lives in
//X-Axis for Speeds
g.drawLine(100, 150, 450, 150);//the graphics display has 0,0 in the upper left corner versus the lower left corner
int i = 120;
int k = 1460;
while (i<440){
g.drawString("|", i, 155);
g.drawString("" + k + "", i-2, 140);
k = k + 20;
i = i + 60;
}
//Y-Axis
g.drawLine(100, 500, 100, 150);
k= 7000;
int j = 500;
while (j>160){
g.drawString("" + k, 60, j);
g.drawString("--", 94, j);
k = k - 1000;
j = j - 50;
}
Font f1 = new Font("Serif", 4, 15);
g.setFont(f1);
g.drawString(this.title, 200,30);//Graph Title
g.drawString(this.subTitle, 225, 50);
Font f2 = new Font("Serif", 2, 15);
g.setFont(f2);
g.drawString("Sound Speed ", 200, 110);//x-axis label
g.drawString("(" + spdUnits + ")", 290, 110); //Units label--taken from input array
g.drawString("Depth", 10, 180); //y-axis label
g.drawString("(" + depUnits + ")", 07, 200); //Units label--taken from input array
//((Graphics2D)g).scale(20, 20);
}
/**Creates and shows the GUI drawing of the sound speed profile in a JFrame
*/
private void createAndShowGUI(){
frame = new JFrame("Sound Speed Profile");
canvas = new Canvas();
frame.add(canvas);
frame.addMouseListener(this);
frame.setBackground(Color.cyan);
frame.setSize(600,800);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLayout(new BorderLayout());
frame.add(this, BorderLayout.CENTER);//add the sound speed profile graphic and set a Border Layout
//frame.pack();
frame.setVisible(true);
}
/**
* Runs test cases
* @param args
*/
public static void main (String [] args){
ssp.setTitle("Sound Speed Profile 1");
ssp.setSubtitle("June 1, 2012");
ssp.createAndShowGUI();
ssp.repaint(); //necessary?
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mouseClicked(MouseEvent arg0) {
int x = arg0.getX();
//System.out.println("x: " + x);
int xMin = x - 50;
int xMax = x + 50;
int y = arg0.getY();
//System.out.println("y: " + y);
int yMin = y-50;
int yMax = y + 50;
//If the user clicked on the x-axis
if ( 160<y && y<180 && 100<x && x<450){
System.out.println("About to zoom in on the x-axis");
zoomIn(x, y);
//System.out.println("zooming in on the x-axis");
}
//If the user clicked on the y-axis
if (90<x && x<110 && 150 <y && y<500){
//System.out.println("zooming in on the y-axis");
}
}
public void zoomIn(int x, int y){
AffineTransform old = ((Graphics2D) g).getTransform();
for (double zoom = 1; zoom >=0.1; zoom=-0.1){
AffineTransform tr2 =AffineTransform.getTranslateInstance(-x, -y);
AffineTransform tr= AffineTransform.getScaleInstance(zoom,zoom);
tr.concatenate(tr2); tr2=tr;
tr =AffineTransform.getTranslateInstance(x, y);
tr.concatenate(tr2); tr2=tr;
tr= new AffineTransform(old);
tr.concatenate(tr2); tr2=tr;
((Graphics2D)g).setTransform(tr2);
((Graphics2D)g).drawRect(x, y, 10, 10);
((Graphics2D)g).setTransform(old);
}
}