更多"下面程序是由鼠标事件在窗体上画图，如果按下鼠标将可以画图，双击窗体可以"的相关试题:
[填空题]下面程序是由鼠标事件在窗体上画图，如果按下鼠标将可以画图，双击窗体可以清除所画图形。补充完整下面的程序。
首先在窗体层定义如下变量：
Dim PaintStart As Boolean
编写如下事件过程：
Private Sub Form_Load（ ）
DrawWidth=2
ForeColor=vbGreen
End Sub
Private Sub Form_MouseDown(Button As Integer，Shift As Integer，_
X As Single，Y As Single)
【 】
End Sub
Private Sub Form_MouseMove(Button As Integer，Shift As Integer，_
X As Single，Y As Single)
If PaintStart Then
PSet(X，Y)
End If
End Sub
Private Sub Form_MouseUp(Button As Integer，Shift As Integer，_
X As Single，Y As Single)
【 】
End Sub
Private Sub Form_Db1Click（ ）
【 】
End Sub
[填空题]下面的程序是由鼠标事件在窗体上画图，如果按下鼠标将可以画图，双击窗体可以清除所画图形。补充完整下面的程序。首先在窗体层定义如下变量：
Dim PaIntStart As Boolean
编写如下事件过程：
Private Sub Form_Load（ ）
DrawWidth=2
ForeColor=vbGreen
End Sub
Private Sub Form_MouscDown(Button As Integer，Shift As Integer，_
X As Single，Y As Single)
[13]
End Sub
Private Sub Form_MouseMove(Button As Integer，Shift As Integer，_
X As Single，Y As Single)
If PaintStart Then
PSet(X，Y)
End If
End Sub
Private Sub Form_MouseUp(Button As Integer，Shift As Integer，_
X As Single，Y As Single)
[14]
End Sub
Private Sub Form_DblClick（ ）
[15]
End Sub
[填空题]下面程序是由鼠标事件在窗体上画图，如果按下鼠标将可以画图，双击窗体可以清除所画图形。补充完整下而的程序。
首先在窗体层定义如下变量：
Dim PaintStart As Boolean
编写如下事件过程：
Private Sub Form_Load（ ）
DrawWidth=2
ForeColor=vbGreen
End Sub
Private Sub Form_MouseDown(Button As Integer，Shift As Integer,_X As Single，Y As Single)
PaintStart=True
End Sub
Private Sub Form_MouseMove(Button As Integer，Shift As Integer,_x As Single，Y As Single)
If PaintStart Then
PSet(X,Y)
End If
End Sub
Private Sub Form_MouseUp(Button As Integer，Shift As Integer,_X As Single，Y As Single)
______
End Sub
Private Sub Form-DblClick（ ）
Cls
End Sub
[简答题]下面是一个Applet程序，程序的功能是用鼠标画图。本题是通过单击鼠标后画出一个Java字。请改正程序中的错误(有下划线的语句)，使程序能输出正确的结果。
注意；不改动程序的结构，不得增行或减行。
源程序文件代码清单如下；
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
/*
＜applet code=SimpleHitMouse.java width=800 height=400＞
＜/applet＞
*/
public class SimpleHitMouse implements Applet
{
private java.util.Vector points=new java.util.Vector（ ）;
public void init（ ）
{
addMouseListener(new MouseAdapter（ ）
{
public void mousePressed(MouseEvent e)
{
points.add(new Point(e.getX（ ）,e.getY（ ）)
paint（ ）;
}
});
}
public void update(Graphics g)
}
repaint(g);
}
public void paint(Graphics g)
{
for(int i=0;i＜points.size（ ）;i++)
{
Point dot=(Point)points.elementAt(i);
g.drawString("x",dot.x,dot.y);
}
}
public static void main(String args[ ])
{
Frame fram=new Frame("CelayTree");
SimpleHitMouse dot=new SimpleHitMouse（ ）;
dot.i
