VB如何绘制鼠标拖动轨迹

Dim xx As Double, yy As Double

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Private Sub Form_MouseMove(Button As Integer, Shift As Integer, X As Single, Y As Single)

If xx = 0 And yy = 0 Then

xx = X: yy = Y

Else

Form1.Line (xx, yy)-(X, Y), 1

End If

xx = X: yy = Y

End Sub

我调试成功的例子。

VB.net怎样按住鼠标移动无边框窗体

1.在mouse事件中实现

2.调用windows API

实现方式为：

1.在mouse事件中实现

[csharp] view plain copy

Point mouseOff;//鼠标移动位置变量

bool leftFlag;//标签是否为左键

private void groupControl1_MouseUp(object sender, MouseEventArgs e)

{

if (leftFlag)

{

leftFlag = false;//释放鼠标后标注为false;

}

}

private void groupControl1_MouseMove(object sender, MouseEventArgs e)

{

if (leftFlag)

{

Point mouseSet = Control.MousePosition;

mouseSet.Offset(mouseOff.X, mouseOff.Y); //设置移动后的位置

Location = mouseSet;

}

}

private void groupControl1_MouseDown(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

mouseOff = new Point(-e.X, -e.Y); //得到变量的值

leftFlag = true; //点击左键按下时标注为true;

}

}

private void groupControl1_MouseDown(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

mouseOff = new Point(-e.X, -e.Y); //得到变量的值

leftFlag = true; //点击左键按下时标注为true;

}

}

2.调用windows API

调用前需要添加using System.Runtime.InteropServices;

[csharp] view plain copy

[DllImport("user32.dll")]

public static extern bool ReleaseCapture();

[DllImport("user32.dll")]

public static extern bool SendMessage(IntPtr hwnd, int wMsg, int wParam, int lParam);

private void groupControl1_MouseDown(object sender, MouseEventArgs e)

{

if (e.Button == MouseButtons.Left)

{

ReleaseCapture(); //释放鼠标捕捉

//发送左键点击的消息至该窗体(标题栏)

SendMessage(Handle, 0xA1, 0x02, 0);

}

}

怎样用VB实现:用鼠标拖动绘制实圆与多种虚线圆

Dim

s

As

Boolean,

ci

As

Integer,

xianxing

As

Integer,

xiankuan

As

Integer

Dim

x0

As

Single,

y0

As

Single

Private

Sub

Command1_Click()

s

=

True

Command1.Enabled

=

False

End

Sub

Private

Sub

Form_Load()

Dim

b

b

=

Array("透明",

"实线",

"虚线",

"点线",

"点划线",

"双点划线")

Frame1.Move

100,

100,

1300,

3500

Frame1.Caption

=

"线型"

Frame2.Move

Width

-

1500,

100,

1300,

3500

Frame2.Caption

=

"线宽"

For

i

=

To

5

Option1(i).Move

100,

300

+

i

*

500,

1100,

300

Option1(i).Caption

=

b(i)

Option2(i).Move

100,

500

+

i

*

500,

800,

300

Option2(i).Caption

=

i

+

1

"点宽"

Next

i

Shape1(0).Visible

=

False

Shape1(1).Visible

=

False

s

=

ci

=

-1

Command1.Caption

=

"开始画圆"

Command1.ToolTipText

=

"点击按钮后在窗体内按下鼠标左键处为圆心，拖到半径处松开鼠标左键即可"

End

Sub

Private

Sub

Form_MouseDown(Button

As

Integer,

Shift

As

Integer,

X

As

Single,

Y

As

Single)

If

s

And

Button

=

1

Then

x0

=

X

y0

=

Y

ci

=

ci

+

1

If

ci

1

Then

Load

Shape1(ci)

Shape1(ci).Visible

=

True

Shape1(ci).BorderStyle

=

xianxing

Shape1(ci).Move

x0,

y0,

0,

Shape1(ci).Shape

=

3

Shape1(ci).BorderWidth

=

xiankuan

End

If

End

Sub

Private

Sub

Form_MouseMove(Button

As

Integer,

Shift

As

Integer,

X

As

Single,

Y

As

Single)

If

s

And

Button

=

1

Then

banjing

=

Sqr((x0

-

X)

*

(x0

-

X)

+

(y0

-

Y)

*

(y0

-

Y))

Shape1(ci).Move

x0

-

banjing,

y0

-

banjing,

2

*

banjing,

2

*

banjing

End

If

End

Sub

Private

Sub

Form_MouseUp(Button

As

Integer,

Shift

As

Integer,

X

As

Single,

Y

As

Single)

Command1.Enabled

=

True

s

=

False

End

Sub

Private

Sub

Option1_Click(Index

As

Integer)

For

i

=

To

5

If

Option1(i)

Then

xianxing

=

i

Next

i

If

i

=

1

Then

Frame2.Enabled

=

True

Else

Frame2.Enabled

=

False

xiankuan

=

1

End

If

End

Sub

Private

Sub

Option2_Click(Index

As

Integer)

For

i

=

To

5

If

Option2(i)

Then

xiankuan

=

1

+

i

Next

i

End

Sub

界面稍微复杂了点：

一个按钮，两个框架，第一框架上option1共六个，第二个框架上option2也是六个。

网页标题：vb.net鼠标拖动画,vb拖动控件
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