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在画布上写字java代码 java画布如何画三角形

代码IT技术

JAVA画布类编程实现Runnable接口类，new Thread(this).start(); 开启线程自己写个方法 函数外定义一个 long oldTime=System.currentTimeMillis(); //旧的记录时间 if(System.currentTimeMillis()-oldTime30000){//这里面要执行的语句 。
oldTime =System.currentTimeMillis();
}
java 在JTextField输入文字 按Enter键 这个文字显示在画布里面 Graphics方法从JTextField获得字符串,然后把字符串画在里面就可以了.
具体方法:
JTextField jtf=new JTextField();//new JTextField
String str=jtf.getText();//获取字符串
Graphics g=newGraphics();//newGraphics
g.drawString(str,100,100);//根据给定字符串,长度宽度画出字符串.
java从JTextField输入文字 ， 按Enter键盘在画布里面显示JTextField输入文字多个也可以标准在画布上写字java代码的答案!在JTextField添加键盘事件在画布上写字java代码，判断按键是否是Enter键在画布上写字java代码，如果是在画布上写字java代码，就将JTextField在画布上写字java代码的值取出来，显示在画布里
java 如何在画布某个坐标上写字canvas中有一个函数translate（）是用来实现画布平移在画布上写字java代码的在画布上写字java代码 ， 画布的原状是以左上角为原点在画布上写字java代码，向左是x轴正方向在画布上写字java代码，向下是y轴正方向，如下图所示，也就是（0,0） 。
java 涂鸦画板
import java.awt.BasicStroke;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Label;
import java.awt.Panel;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
public class MouseDrawPanel extends Frame
{
private static final long serialVersionUID = 1L;
MouseEvent e = null;
int startX = -1;
int startY = -1;
int endX = -1;
int endY = -1;
boolean left = false;
public MouseDrawPanel ( String title )
{
setTitle (title);
setLayout (new BorderLayout ());
setResizable (false);
setSize (500, 400);
setLocationRelativeTo (null);
addWindowListener (new WindowAdapter ()
{
@Override
public void windowClosing ( WindowEvent e )
{
System.exit (0);
}
});
}
@Override
public void paintComponents ( Graphics g )
{
float lineWidth = 8.0f;
( (Graphics2D) g ).setStroke (new BasicStroke (lineWidth));
g.setColor (Color.YELLOW);
g.drawLine (startX, startY, endX, endY);
g.dispose ();
}
public static void main ( String[] args )
{
final MouseDrawPanel mdp = new MouseDrawPanel ("Use Mouse Draw");
Panel panel = new Panel ();
panel.setLayout (new FlowLayout (FlowLayout.LEFT));
Label startL = new Label ("start: ");
Label endL = new Label ("end: ");
final Label nowL = new Label ("now: ");
final Label startR = new Label ("000,000");
final Label endR = new Label ("000,000");
【在画布上写字java代码 java画布如何画三角形】final Label nowN = new Label ("000,000");
panel.add (startL);
panel.add (startR);
panel.add (endL);
panel.add (endR);
panel.add (nowL);
panel.add (nowN);
mdp.add (panel, "South");
mdp.addMouseMotionListener (new MouseMotionListener ()
{
@Override
public void mouseMoved ( MouseEvent e )
{
if (mdp.left)
{
nowN.setText (e.getX () + " , " + e.getY ());
}
}
@Override
public void mouseDragged ( MouseEvent e )

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