根据框大小绘制复选框勾号？

Question

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勾号。

要绘制勾号，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

问题是打勾的size/points是根据默认复选框大小指定的，我从这篇文章中得到的主要思想：

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号：

问题

如何动态修改我对 DrawTick 方法中的点所做的算术以修复其他框尺寸的刻度尺寸？

Answer 1

您需要一个比例因子来确定每个 "x" 和 "y" 坐标增加多少。下面是一个示例（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)
        }

根据框大小绘制复选框勾号？

Draw checkbox tick according to the box size?

.net

vb.net

user-controls

gdi+

winforms

简介

问题

问题