java 边界标志算法
时间: 2023-11-10 16:55:49 浏览: 41
Java 中的边界标志算法实际上是字符串匹配算法中的一种,它用于在文本中查找给定的字符串。该算法通过检查文本字符串中是否存在与给定字符串完全匹配的子字符串来确定字符串位置。具体实现方法包括 KMP 算法和 Boyer-Moore 算法等。如果你有更具体的问题或需要了解更多,我可以为你提供更详细的信息。
相关问题
请给出java边界标志算法绘制多边形的代码
以下是Java中实现边界标志算法绘制多边形的代码:
```java
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class PolygonDrawer extends JFrame {
private ArrayList<Point> points;
private int mouseX, mouseY;
private boolean mouseDown = false;
private boolean firstPoint = true;
public PolygonDrawer() {
super("Polygon Drawer");
setSize(640, 480);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// create the list to hold the points
points = new ArrayList<Point>();
// add the mouse listener for the drawing area
JPanel panel = new JPanel() {
public void paintComponent(Graphics g) {
super.paintComponent(g);
drawPolygon(g);
}
};
panel.setBackground(Color.WHITE);
panel.addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent e) {
mouseX = e.getX();
mouseY = e.getY();
mouseDown = true;
if (firstPoint) {
points.add(new Point(mouseX, mouseY));
firstPoint = false;
}
}
public void mouseReleased(MouseEvent e) {
mouseDown = false;
}
});
panel.addMouseMotionListener(new MouseMotionAdapter() {
public void mouseMoved(MouseEvent e) {
mouseX = e.getX();
mouseY = e.getY();
repaint();
}
public void mouseDragged(MouseEvent e) {
mouseX = e.getX();
mouseY = e.getY();
if (mouseDown) {
points.add(new Point(mouseX, mouseY));
repaint();
}
}
});
getContentPane().add(panel);
setVisible(true);
}
public static void main(String[] args) {
new PolygonDrawer();
}
private void drawPolygon(Graphics g) {
if (points.size() > 0) {
int[] xPoints = new int[points.size()];
int[] yPoints = new int[points.size()];
for (int i = 0; i < points.size(); i++) {
xPoints[i] = points.get(i).x;
yPoints[i] = points.get(i).y;
}
g.drawPolygon(xPoints, yPoints, points.size());
}
if (mouseDown) {
if (points.size() > 0) {
int[] xPoints = new int[points.size() + 1];
int[] yPoints = new int[points.size() + 1];
for (int i = 0; i < points.size(); i++) {
xPoints[i] = points.get(i).x;
yPoints[i] = points.get(i).y;
}
xPoints[points.size()] = mouseX;
yPoints[points.size()] = mouseY;
g.drawPolyline(xPoints, yPoints, points.size() + 1);
} else {
g.drawLine(mouseX, mouseY, mouseX, mouseY);
}
}
}
}
```
希望对你有帮助!
用java小程序利用边界标志算法给一个凸五边形填充颜色
非常好的问题!根据您提供的算法,可以使用Java小程序为凸五边形填充颜色。
首先,需要定义凸五边形的顶点。然后,通过边界标志算法,将凸五边形内部的每个像素点都判断为是否在凸五边形内部。最后,对于在凸五边形内部的像素点,填充指定颜色即可。
需要注意的是,边界标志算法在边界上可能会出现像素点重叠的情况,这可以通过设置优先级来解决。
希望这个回答能够帮上您!如果您还有其他的问题,欢迎再次向我提出。
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