根据框大小绘制复选框？答案

【问题标题】：Draw checkbox tick according to the box size?根据框大小绘制复选框？
【发布时间】：2015-07-13 07:07:18
【问题描述】：

简介

我正在编写一个简单的复选框用户控件，它将以自定义颜色绘制背景和刻度。

要画勾号，我这样做：

    ''' <summary>
    ''' Draws the checkbox tick.
    ''' </summary>
    ''' <param name="g">The drawing surface.</param>
    ''' <param name="rect">The box rectangle.</param>
    ''' <param name="checkState">The checkbox state.</param>
    Private Sub DrawTick(ByVal g As Graphics,
                         ByVal rect As Rectangle,
                         ByVal checkState As CheckState)

        Select Case checkState

            Case checkState.Checked

                Dim points As PointF() =
                    New PointF() {
                        New PointF(rect.X + 3, rect.Y + 5),
                        New PointF(rect.X + 5, rect.Y + 7),
                        New PointF(rect.X + 9, rect.Y + 3),
                        New PointF(rect.X + 9, rect.Y + 4),
                        New PointF(rect.X + 5, rect.Y + 8),
                        New PointF(rect.X + 3, rect.Y + 6),
                        New PointF(rect.X + 3, rect.Y + 7),
                        New PointF(rect.X + 5, rect.Y + 9),
                        New PointF(rect.X + 9, rect.Y + 5)
                    }

                Using checkPen As New Pen(Me.TickColor, 1)
                    g.DrawLines(checkPen, points)
                End Using

            Case checkState.Indeterminate

                Using checkBrush As New SolidBrush(Me.TickColor)

                    g.FillRectangle(checkBrush, New Rectangle(rect.X + 3,
                                                              rect.Y + 3,
                                                              rect.Width - 5,
                                                              rect.Height - 5))
                End Using

            Case checkState.Unchecked
                ' Do Nothing.

        End Select

    End Sub

这是结果：

问题

问题是tick的大小/点是根据默认复选框大小指定的，我从这篇文章中得到了主要思想：

True Transparency support for the .NET CheckBox control

所以，假设我增加了复选框的框（上面代码的rect var 的宽度和高度）然后它会画一个像这样的小勾：

问题

如何动态修改我在 DrawTick 方法中使用 Points 执行的算术以修复其他框大小的刻度大小？

【问题讨论】：

标签： .net vb.net winforms user-controls gdi+

【解决方案1】：

您需要一个比例因子来确定每个“x”和“y”坐标增加多少。这是一个示例（假设默认复选框宽度为 12 像素，这只是一个猜测）：

    Dim scaleFactor As Single = CType(rect.Width, Single) / 12.0
    Dim points As PointF() =
        New PointF() {
            New PointF(rect.X + scaleFactor * 3, rect.Y + scaleFactor * 5),
            New PointF(rect.X + scaleFactor * 5, rect.Y + scaleFactor * 7),
            New PointF(rect.X + scaleFactor * 9, rect.Y + scaleFactor * 3),
            New PointF(rect.X + scaleFactor * 9, rect.Y + scaleFactor * 4),
            New PointF(rect.X + scaleFactor * 5, rect.Y + scaleFactor * 8),
            New PointF(rect.X + scaleFactor * 3, rect.Y + scaleFactor * 6),
            New PointF(rect.X + scaleFactor * 3, rect.Y + scaleFactor * 7),
            New PointF(rect.X + scaleFactor * 5, rect.Y + scaleFactor * 9),
            New PointF(rect.X + scaleFactor * 9, rect.Y + scaleFactor * 5)
        }

【讨论】：