Java 如何快速拖动鼠标光标绘制重复椭圆的连续曲线?
此代码用于在JPanel上绘制。在Java 如何快速拖动鼠标光标绘制重复椭圆的连续曲线?,java,swing,paintcomponent,graphics2d,mousemotionlistener,Java,Swing,Paintcomponent,Graphics2d,Mousemotionlistener,此代码用于在JPanel上绘制。在paintComponent(Graphics)中,我试图通过重复的Graphics2D#fillOval(x,y,with,height)绘制曲线 应用程序工作正常,当我慢慢拖动鼠标光标时;它根据我的需要画了一条连续的曲线。但当我加速拖动鼠标光标时,结果是分离的点,而不是连续的曲线 那么,即使我加速拖动,如何让它绘制一条连续曲线呢 import java.awt.*; import java.awt.event.*; import java.util.Arra
paintComponent(Graphics)
中,我试图通过重复的Graphics2D#fillOval(x,y,with,height)
绘制曲线
应用程序工作正常,当我慢慢拖动鼠标光标时;它根据我的需要画了一条连续的曲线。但当我加速拖动鼠标光标时,结果是分离的点,而不是连续的曲线
那么,即使我加速拖动,如何让它绘制一条连续曲线呢
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import javax.swing.*;
public class Painter extends JPanel {
int x, y;
ArrayList<Point> points;
public Painter() {
setBackground(Color.white);
points = new ArrayList<>();
MouseHandler listener = new MouseHandler();
this.addMouseMotionListener(listener);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(600, 600);
}
private class MouseHandler extends MouseAdapter implements MouseMotionListener {
@Override
public void mouseDragged(MouseEvent e) {
Point point = new Point(e.getX(), e.getY());
points.add(point);
repaint();
}
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
for (Point point : points) {
g2d.fillOval(point.x, point.y, 15, 15);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame f = new JFrame();
f.setContentPane(new Painter());
f.pack();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
});
}
}
import java.awt.*;
导入java.awt.event.*;
导入java.util.ArrayList;
导入javax.swing.*;
公共类油漆工扩展JPanel{
int x,y;
阵列列表点;
公共画家(){
挫折地面(颜色:白色);
points=新的ArrayList();
MouseHandler listener=新的MouseHandler();
this.addMouseMotionListener(listener);
}
@凌驾
公共维度getPreferredSize(){
返回新维度(600600);
}
私有类MouseHandler扩展了MouseAdapter,实现了MouseMotionListener{
@凌驾
公共无效鼠标标记(鼠标事件e){
点=新点(e.getX(),e.getY());
点。添加(点);
重新油漆();
}
}
@凌驾
受保护组件(图形g){
超级组件(g);
Graphics2D g2d=(Graphics2D)g;
用于(点:点){
g2d.圆角(点x、点y、点15、点15);
}
}
公共静态void main(字符串[]args){
SwingUtilities.invokeLater(新的Runnable(){
@凌驾
公开募捐{
JFrame f=新的JFrame();
f、 setContentPane(新画师());
f、 包装();
f、 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f、 setVisible(真);
}
});
}
}
如您对之前类似问题的评论中所述:
- 不要在paintComponent方法中绘制离散的椭圆
- 而是通过在相邻点之间绘制线来连接paintComponent中列表中的点
- 如果需要使线条更粗,请使用厚度更宽的线条更改Graphics2D对象的笔划属性
- 但是,请注意笔划,因为通常不希望特性更改沿绘制链向下传播。这意味着您有时需要复制图形对象,并在新图形对象上设置笔划,然后使用该笔划进行绘制,然后将其丢弃
- 创建笔划的最简单方法是使用BasicStroke类,例如,
将获得一条漂亮的粗曲线new BasicStroke(6f)
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import javax.swing.*;
public class Painter2 extends JPanel {
private static final float STROKE_WIDTH = 15f;
private static final Stroke STROKE = new BasicStroke(STROKE_WIDTH, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
int x, y;
ArrayList<Point> points;
public Painter2() {
setBackground(Color.white);
points = new ArrayList<>();
MouseHandler listener = new MouseHandler();
this.addMouseMotionListener(listener);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(600, 600);
}
private class MouseHandler extends MouseAdapter implements MouseMotionListener {
@Override
public void mouseDragged(MouseEvent e) {
Point point = new Point(e.getX(), e.getY());
points.add(point);
repaint();
}
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setStroke(STROKE);
for (int i = 1; i < points.size(); i++) {
int x1 = points.get(i - 1).x;
int y1 = points.get(i - 1).y;
int x2 = points.get(i).x;
int y2 = points.get(i).y;
g2d.drawLine(x1, y1, x2, y2);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame f = new JFrame();
f.setContentPane(new Painter2());
f.pack();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
});
}
}
import java.awt.*;
导入java.awt.event.*;
导入java.util.ArrayList;
导入javax.swing.*;
公共类画家2扩展JPanel{
专用静态最终浮动行程_宽度=15f;
私有静态最终冲程=新的基本冲程(冲程宽度、基本冲程.CAP\u轮、基本冲程.JOIN\u轮);
int x,y;
阵列列表点;
公共画家2(){
挫折地面(颜色:白色);
points=新的ArrayList();
MouseHandler listener=新的MouseHandler();
this.addMouseMotionListener(listener);
}
@凌驾
公共维度getPreferredSize(){
返回新维度(600600);
}
私有类MouseHandler扩展了MouseAdapter,实现了MouseMotionListener{
@凌驾
公共无效鼠标标记(鼠标事件e){
点=新点(e.getX(),e.getY());
点。添加(点);
重新油漆();
}
}
@凌驾
受保护组件(图形g){
超级组件(g);
Graphics2D g2d=(Graphics2D)g;
g2d.设定行程(行程);
对于(int i=1;i
或者更好:
import java.awt.*;
import java.awt.event.*;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;
@SuppressWarnings("serial")
public class Painter2 extends JPanel {
private static final float STROKE_WIDTH = 15f;
private static final Stroke STROKE = new BasicStroke(STROKE_WIDTH, BasicStroke.CAP_ROUND,
BasicStroke.JOIN_ROUND);
private static final Color CURVES_COLOR = Color.BLUE;
private static final Color TEMP_CURVE_COLOR = Color.PINK;
private List<List<Point>> curvesList = new ArrayList<>();
private List<Point> tempCurve = null;
public Painter2() {
setBackground(Color.white);
MouseHandler listener = new MouseHandler();
addMouseListener(listener);
addMouseMotionListener(listener);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(600, 600);
}
private class MouseHandler extends MouseAdapter implements MouseMotionListener {
@Override
public void mousePressed(MouseEvent e) {
tempCurve = new ArrayList<>();
tempCurve.add(e.getPoint());
repaint();
}
@Override
public void mouseDragged(MouseEvent e) {
tempCurve.add(e.getPoint());
repaint();
}
@Override
public void mouseReleased(MouseEvent e) {
tempCurve.add(e.getPoint());
curvesList.add(tempCurve);
tempCurve = null;
repaint();
}
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2 = (Graphics2D) g.create();
g2.setStroke(STROKE);
g2.setColor(CURVES_COLOR);
for (List<Point> curve : curvesList) {
drawCurve(g2, curve);
}
if (tempCurve != null) {
g2.setColor(TEMP_CURVE_COLOR);
drawCurve(g2, tempCurve);
}
g2.dispose();
}
private void drawCurve(Graphics2D g2, List<Point> ptList) {
for (int i = 1; i < ptList.size(); i++) {
int x1 = ptList.get(i - 1).x;
int y1 = ptList.get(i - 1).y;
int x2 = ptList.get(i).x;
int y2 = ptList.get(i).y;
g2.drawLine(x1, y1, x2, y2);
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
JFrame f = new JFrame();
f.setContentPane(new Painter2());
f.pack();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
});
}
}
import java.awt.*;
导入java.awt.event.*;
导入java.util.ArrayList;
导入java.util.List;
导入javax.swing.*;
@抑制警告(“串行”)
公共类画家2扩展JPanel{
专用静态最终浮动行程_宽度=15f;
专用静态最终行程行程=新的基本行程(行程宽度、基本行程.CAP\U圆形、,
基本行程。加入(轮);
私有静态最终颜色曲线\u Color=Color.BLUE;
专用静态最终颜色温度曲线颜色=Color.PINK;
private List curvesList=new ArrayList();
私有列表tempcrove=null;
公共画家2(){
挫折地面(颜色:白色);
MouseHandler listener=新的MouseHandler();
addMouseListener(监听器);
addMouseMotionListener(listener);
}
@凌驾
公共维度getPreferredSize(){
返回新维度(600600);
}
私有类MouseHandler扩展了MouseAdapter,实现了MouseMotionListener{
@凌驾
公共无效鼠标按下(MouseEvent e){
tempCurve=新的ArrayList();
添加(例如getPoint());
重新油漆();
}
@凌驾
公共无效鼠标标记(鼠标事件e){
添加(例如getPoint());
重新油漆();
}
@凌驾
公共无效MouseEvent(MouseEvent e){
添加(例如getPoint());