在使用Spread.Net的时候，可以采用注释的模式创建一个Free-Hand图形。

下面是具体的示例代码：

》》》免费下载Spread.Net

C#

private void button1_Click(object sender, EventArgs e)

        {

            fpSpread1.StartAnnotationMode(true);

            //fpSpread1.StartAnnotationMode();

        }

 

        private void button2_Click(object sender, EventArgs e)

        {

            fpSpread1.StopAnnotationMode();

        }

 

        private void fpSpread1_AnnotationModeStarting(object sender, FarPoint.Win.Spread.AnnotationModeEventArgs e)

        {

            

            e.DrawingSurface.ForeColor = Color.BlueViolet;

            e.DrawingSurface.BackColor = Color.Thistle;

        }

 

        private void fpSpread1_AnnotationModeEnding(object sender, FarPoint.Win.Spread.AnnotationModeEventArgs e)

        {

            listBox1.Items.Add("Stop Drawing");

        }

VB

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        FpSpread1.StartAnnotationMode(True)

        'FpSpread1.StartAnnotationMode()

    End Sub

 

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        FpSpread1.StopAnnotationMode()

    End Sub

 

    Private Sub FpSpread1_AnnotationModeStarting(ByVal sender As System.Object, ByVal e As FarPoint.Win.Spread.AnnotationModeEventArgs) Handles FpSpread1.AnnotationModeStarting

        e.DrawingSurface.ForeColor = Color.BlueViolet

        e.DrawingSurface.BackColor = Color.Thistle

    End Sub

 

    Private Sub FpSpread1_AnnotationModeEnding(ByVal sender As System.Object, ByVal e As FarPoint.Win.Spread.AnnotationModeEventArgs) Handles FpSpread1.AnnotationModeEnding

        ListBox1.Items.Add("Stop Drawing")

    End Sub