新手程序员在这里.

我正在制作一个程序,用于在笛卡尔坐标系中呈现用户输入的方程.目前我遇到一些让用户在坐标中自由移动视图的问题.目前使用mouseDragged,用户可以稍微拖动视图,但是一旦用户释放鼠标并尝试再次移动视图,原点就会快速回到鼠标光标的当前位置.让用户自由移动的最佳方法是什么？提前致谢！

这是绘图区域的代码.

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Point;

import java.awt.Rectangle;

import java.awt.event.MouseEvent;

import java.awt.event.MouseListener;

import java.awt.event.MouseMotionListener;

import java.awt.geom.Line2D;

import java.awt.geom.Point2D;

import javax.swing.JPanel;

public class DrawingArea extends JPanel implements MouseMotionListener {

private final int x_panel = 350; // width of the panel

private final int y_panel = 400; // height of the panel

private int div_x; // width of one square

private int div_y; // height of one square

private int real_y;

private int real_x;

private Point origin; // the origin of the coordinate

private Point temp; // temporary point

private static int y = 0;

private static int x = 0;

DrawingArea() {

setBackground(Color.WHITE);

real_x = x_panel;

real_y = y_panel;

setDivisionDefault();

setOrigin(new Point((real_x / 2), (real_y / 2)));

setSize(x_panel, y_panel);

addMouseMotionListener(this);

}

DrawingArea(Point origin, Point destination) {

this.origin = origin;

this.destination = destination;

panel = new JPanel();

panel.setSize(destination.x, destination.y);

panel.setLocation(origin);

this.panel.setBackground(Color.red);

panel.setLayout(null);

}

@Override

public void paintComponent(Graphics g) {

super.paintComponent(g);

Graphics2D line = (Graphics2D) g;

temp = new Point(origin.x, origin.y);

line.setColor(Color.red);

drawHelpLines(line);

line.setColor(Color.blue);

drawOrigin(line);

line.setColor(Color.green);

for (int i = 0; i < 100; i++) { // This is a test line

//temp = this.suora();

temp.x++;

temp.y++;

line.drawLine(temp.x, temp.y, temp.x, temp.y);

}

}

public void setOrigin(Point p) {

origin = p;

}

public void drawOrigin(Graphics2D line) {

line.drawLine(origin.x, 0, origin.x, y_panel);

line.drawLine(0, origin.y, x_panel, origin.y);

}

public void drawHelpLines(Graphics2D line) {

int xhelp= origin.x;

int yhelp= origin.y;

for (int i = 0; i < 20; i++) {

xhelp+= div_x;

line.drawLine(xhelp, 0, xhelp, y_panel);

}

xhelp= origin.x;

for (int i = 0; i < 20; i++) {

xhelp-= div_x;

line.drawLine(xhelp, 0, xhelp, y_panel);

}

for (int i = 0; i < 20; i++) {

yhelp-= div_y;

line.drawLine(0, yhelp,x_panel, yhelp);

}

yhelp= origin.y;

for (int i = 0; i < 20; i++) {

yhelp+= div_y;

line.drawLine(0, yhelp, x_panel, yhelp);

}

}

public void setDivisionDefault() {

div_x = 20;

div_y = 20;

}

@Override

public void mouseDragged(MouseEvent e) {

//Point temp_point = new Point(mouse_x,mouse_y);

Point coords = new Point(e.getX(), e.getY());

setOrigin(coords);

repaint();

}

@Override

public void mouseMoved(MouseEvent e) {

}

}