如何：建立具圖案的 Windows Form

發行項
2024-10-03

這個範例會讓表單呈現橢圓形的形狀，且該形狀會隨著表單重設大小。

範例

protected:
    virtual void OnPaint(
        System::Windows::Forms::PaintEventArgs^ e) override
    {
        System::Drawing::Drawing2D::GraphicsPath^ shape =
            gcnew System::Drawing::Drawing2D::GraphicsPath();
        shape->AddEllipse(0, 0, this->Width, this->Height);
        this->Region = gcnew System::Drawing::Region(shape);
    }

protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
{
    System.Drawing.Drawing2D.GraphicsPath shape = new System.Drawing.Drawing2D.GraphicsPath();
    shape.AddEllipse(0, 0, this.Width, this.Height);
    this.Region = new System.Drawing.Region(shape);
}

 Protected Overrides Sub OnPaint( _
ByVal e As System.Windows.Forms.PaintEventArgs)
     Dim shape As New System.Drawing.Drawing2D.GraphicsPath
     shape.AddEllipse(0, 0, Me.Width, Me.Height)
     Me.Region = New System.Drawing.Region(shape)
 End Sub

編譯程式碼

這個範例需要：

System.Windows.Forms 和 System.Drawing 命名空間的參考。

本範例會覆寫 OnPaint 方法來變更表單的形狀。若要使用此程式碼，請複製方法宣告，以及方法內的繪圖程式碼。

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