Ink.NearestPoint 方法 (Point)

项目
10/28/2008

返回 Ink 对象中离指定 Point（采用墨迹空间 坐标）最近的 Stroke 对象。

命名空间： Microsoft.Ink
程序集： Microsoft.Ink（在 Microsoft.Ink.dll 中）

语法

声明
Public Function NearestPoint ( _
    point As Point _
) As Stroke
用法
Dim instance As Ink
Dim point As Point
Dim returnValue As Stroke

returnValue = instance.NearestPoint(point)

public Stroke NearestPoint(
    Point point
)

public:
Stroke^ NearestPoint(
    Point point
)

public Stroke NearestPoint(
    Point point
)

public function NearestPoint(
    point : Point
) : Stroke

参数

point
类型：System.Drawing.Point
Ink 对象中的指定点，以墨迹空间坐标表示。

返回值

类型：Microsoft.Ink.Stroke
Stroke ，它包含离 Ink 对象中的指定 point 最近的 Point。如果多个笔画包含与已知 Point 距离相同的 Point，则此结果的值可以是任意的。如果 Ink 对象包含零个 Stroke 对象，则返回值为 nullnull 引用（在 Visual Basic 中为 Nothing）（在 Visual Basic 中为 Nothing）。

示例

在此示例中，离墨迹控件中心最近的 Stroke 对象的颜色更改为红色。

Dim inkControl As Control = mInkOverlay.AttachedControl
' get the center of the ink control
Dim centerPt As Point = New Point(inkControl.Width / 2, inkControl.Height / 2)
Using g As Graphics = inkControl.CreateGraphics()
    ' convert center point to ink space coordinates
    mInkOverlay.Renderer.PixelToInkSpace(g, centerPt)
End Using
' get the nearest stroke
Dim nStroke As Stroke = mInkOverlay.Ink.NearestPoint(centerPt)
' nStroke will be null if there aren't any strokes
If Not IsNothing(nStroke) Then
    ' change the color of the nearest stroke to red
    nStroke.DrawingAttributes.Color = Color.Red
    inkControl.Invalidate()
End If

Control inkControl = mInkOverlay.AttachedControl;
// get the center of the ink control
Point centerPt = new Point(inkControl.Width / 2, inkControl.Height / 2);
using (Graphics g = inkControl.CreateGraphics())
{
    // convert center point to ink space coordinates
    mInkOverlay.Renderer.PixelToInkSpace(g, ref centerPt);
}

// get the nearest stroke
Stroke nStroke = mInkOverlay.Ink.NearestPoint(centerPt);

// nStroke will be null if there aren't any strokes
if (nStroke != null)
{
    // change the color of the nearest stroke to red
    nStroke.DrawingAttributes.Color = Color.Red;
    inkControl.Invalidate();
}