方法 : Direct3D オブジェクトを変換します。
[このドキュメントはプレビュー版であり、後のリリースで変更されることがあります。 空白のトピックは、プレースホルダーとして挿入されています。]
ワールド変換を使用して Direct3D オブジェクトをシーン内で移動できます。
注意
マネージの Direct3D モバイル アプリケーションが、Pocket PC やスマートフォン Windows Mobile 5. 0 ソフトウェアを必要です。.NET の外部のリソース フレームワークを最適化します。 Windows Mobile ソフトウェアおよび SDK についてを参照してください。
ワールド空間は、すべての方向に無限に拡張される 3 次元のデカルト領域に似ています。 ワールド変換は、ビュー トランスフォーム ワールド空間からスクリーン空間にオブジェクトを変換する前に Direct3D オブジェクトはワールド空間で配置される位置を定義します。 ワールド変換を使用して変換 (移動)、回転、でき Direct3D オブジェクトを拡張できます。
、オブジェクトに複数のワールド変換を結合するには、変換行列を乗算する必要があります。 この例では、回転行列と平行移動行列が掛け Multiply メソッドを使用してられます。 希望する結果を取得する正しい順序で行列を変換する必要があります。 たとえば、回転行列と平行移動行列を乗算にする必要があります変換する回転変換をする前に次の使用例のように。
使用例
次の使用例のアニメーションが、出荷を表すプリミティブ ボックス メッシュを再生されます。 使用例は、用意されている完全なフォームを次のオブジェクトを含むことができます。
船を表すプリミティブ Mesh オブジェクト。
建物を表すプリミティブ Mesh オブジェクトのセット。
ライトを提供するいくつかの Light オブジェクト。 これらのオブジェクトは、出荷エンジンからの光を表します。
Device オブジェクトを返します。
Imports System
Imports System.Drawing
Imports System.Windows.Forms
Imports Microsoft.WindowsMobile.DirectX
Imports Microsoft.WindowsMobile.DirectX.Direct3D
Class MatrixTransformsHowTo
Inherits Form
' Mesh representing the ship.Private shipMesh As Mesh = Nothing ' Meshes representing buildings.Private wallMeshes(2) As Mesh
Private meshColor As Color = Color.Goldenrod
' Description of the Direct3D light.Private lightData As Light
Private device As Device
PrivateEnum ShipStatus
SS_LIFTOFF = 1
SS_TURNING = 2
SS_ENGINEON = 3
EndEnumPrivate myShipStatus As ShipStatus = ShipStatus.SS_LIFTOFF
Private firstTick AsInteger = 0
Private newTick AsInteger = 0
Private yVal AsSingle = - 2F
Private zVal AsSingle = 2F
PrivateConst midAltitude AsInteger = 85
Private yCameraPosition AsSingle = - 1
Private xCameraPosition AsSingle = - 2
Private startAngle AsSingle = 0F
Private angle AsSingle = 0.1F
Private lastIncrement AsSingle = 0F
Private isEngineFired AsBoolean = FalsePrivate isShipDeparted AsBoolean = FalsePrivate isNewRotationOperation AsBoolean = TruePublicSubNew()
Dim present As PresentParameters
Me.Text = "Flying Ship"
' Enable the form to be closed. ' Required so that Hwnd of the form changes.Me.MinimizeBox = False
present = New PresentParameters()
present.Windowed = True
present.AutoDepthStencilFormat = DepthFormat.D16
present.EnableAutoDepthStencil = True
present.SwapEffect = SwapEffect.Discard
device = New Device(0, DeviceType.Default, Me, CreateFlags.None, present)
AddHandler device.DeviceReset, AddressOf OnDeviceReset
Dim i AsIntegerFor i = 0 To wallMeshes.Length
wallMeshes(i) = NothingNext i
OnDeviceReset(Nothing, EventArgs.Empty)
EndSubPrivateSub OnDeviceReset(ByVal sender AsObject, ByVal e As EventArgs)
' Meshes must be recreated whenever the device ' is reset, no matter which pool they are created in. ' Instead of loading a mesh from a file, ' this sample uses primitive box meshes ' to represent the ship and the buildings.
shipMesh = Mesh.Box(device, 0.8F, 0.18F, 2.2F)
wallMeshes(0) = Mesh.Box(device, 0.5F, 3.6F, 1F)
wallMeshes(1) = Mesh.Box(device, 0.5F, 1.8F, 2F)
wallMeshes(2) = Mesh.Box(device, 0.2F, 1F, 0.75F)
device.RenderState.Ambient = Color.White
' Provides main directional lighting.
device.Lights(0).Type = LightType.Directional
device.Lights(0).Direction = New Vector3(0.3F, - 0.5F, 0.2F)
device.Lights(0).Diffuse = Color.LightBlue
device.Lights(0).Update()
' Provides frontal lighting.
device.Lights(1).Type = LightType.Directional
device.Lights(1).Direction = New Vector3(0F, - 1F, - 3F)
device.Lights(1).Diffuse = Color.DarkSlateGray
device.Lights(1).Update()
' Turn on the lights.
device.Lights(0).Enabled = True
device.Lights(1).Enabled = True ' Turn off the light representing the engine.
device.Lights(2).Enabled = False
' For the projection matrix, set up a perspective transform (which ' transforms geometry from 3-D view space to 2-D viewport space, with ' a perspective divide that makes objects smaller in the distance). To build ' a perspective transform, you need the field of view (1/4 PI is common), ' the aspect ratio, and the near and far clipping planes (which define at ' the distances at which geometry should be no longer be rendered).
device.Transform.Projection = Matrix.PerspectiveFovLH(System.Convert.ToSingle(Math.PI) / 4F, System.Convert.ToSingle(Me.ClientSize.Width) / System.Convert.ToSingle(Me.ClientSize.Height), 1F, 80F)
EndSubProtectedOverridesSub OnPaintBackground(ByVal e As PaintEventArgs)
' Do nothing.EndSubProtectedOverridesSub OnPaint(ByVal e As PaintEventArgs)
Dim material AsNew Material()
Dim engineMaterial AsNew Material()
' Begin the scene and clear the back buffer to black.
device.Clear(ClearFlags.Target Or ClearFlags.ZBuffer, Color.Black, 1F, 0)
device.BeginScene()
material.Diffuse = Color.WhiteSmoke
' Specifies the ambient color for the engines.
engineMaterial.Ambient = Color.White
SetupMatrices()
device.Material = material
' Draw ship on the screen.
shipMesh.DrawSubset(0)
SetupMovingLight()
If isEngineFired Then
device.Material = engineMaterial
device.Lights(2).Enabled = True ' Bind the vertex buffers of the primitive ' mesh to the Device object.
device.SetStreamSource(0, shipMesh.VertexBuffer, 0)
' Redraw the face of the ship representing the engine. ' A Box mesh has 4 vertices per face. The 20th vertex ' is the first vertex representing the engine. To use ' adjacent triangles, set the type to Primitive.TriangleFan.
device.DrawPrimitives(PrimitiveType.TriangleFan, 20, 2)
EndIf
material.Diffuse = Color.GhostWhite
device.Material = material
' Draw buildings, providing coordinates to locate each ' building on the x, y, and z planes. Because the camera is placed ' "behind" the scene initially (at a positive z-axis value in ' the call to Matrix.LookAtLH), positive z-axis values draw ' objects closer to the camera. In addition, positive x-axis ' values draw objects farther to the left instead of to the right. ' Draw the tall building.
device.Transform.World = Matrix.Translation(0.75F, - 0.2F, - 2F)
wallMeshes(0).DrawSubset(0)
' Draw the medium-sized buildings.
device.Transform.World = Matrix.Translation(- 1F, - 0.9F, 0F)
wallMeshes(1).DrawSubset(0)
device.Transform.World = Matrix.Translation(0F, - 0.9F, 0F)
wallMeshes(1).DrawSubset(0)
device.Transform.World = Matrix.Translation(1F, - 0.9F, 0F)
wallMeshes(1).DrawSubset(0)
device.Transform.World = Matrix.Translation(2F, - 0.9F, 0F)
wallMeshes(1).DrawSubset(0)
' Draw the small buildings.
device.Transform.World = Matrix.Translation(- 2F, - 1.5F, 5F)
wallMeshes(2).DrawSubset(0)
device.Transform.World = Matrix.Translation(- 1.25F, - 1.5F, 5F)
wallMeshes(2).DrawSubset(0)
device.Transform.World = Matrix.Translation(- 0.5F, - 1.5F, 5F)
wallMeshes(2).DrawSubset(0)
device.Transform.World = Matrix.Translation(0.75F, - 1.5F, 5F)
wallMeshes(2).DrawSubset(0)
' Finish the scene and present it on the screen.
device.EndScene()
device.Present()
' Repaint the scene.Me.Invalidate()
EndSubPrivateSub SetupMatrices()
' Set the transformation matrices.Dim fAngle AsSingle = angle
' To render the ship, combine a rotation on the y-axis with a ' translation (move) using the Matrix.Multiply method.
device.Transform.World = Matrix.Multiply(Matrix.RotationY(fAngle + startAngle), Matrix.Translation(- 0.5F, yVal, zVal))
' Set up the view matrix. You can define a view matrix with a camera position, ' a point to look at (camera target), and an "up" direction. ' First vector passed to LookAtLH is the camera position. ' Second vector passed to LookAtLH is the camera target. ' Third vector passed to LookAtLH defines the "up" direction. ' In this example, you set the camera seven units up along the z-axis ("behind" ' the scene), down one unit, and left two units. You then point the camera ' just above the origin and define "up" to be in the y-direction.IfNot isShipDeparted Then
device.Transform.View = Matrix.LookAtLH(New Vector3(- 2, - 1, 7), New Vector3(0, 1, 0), New Vector3(0, 1, 0))
Else ' Handles movement of camera after ' the ship "fires" the main engines.
device.Transform.View = Matrix.LookAtLH(New Vector3(xCameraPosition, yCameraPosition, 7), New Vector3(0, 1, 0), New Vector3(0, 1, 0))
xCameraPosition += 0.01F
yCameraPosition += 0.01F
EndIf ' Use the system time to control the animation. ' The high-resolution timer, if present for ' the hardware, could be used instead.Dim tick AsInteger = System.Environment.TickCount
If newTick = 0 Then
firstTick = tick / 100
EndIf
newTick = tick / 100 - firstTick + 1
' Use the tick count to change the current ' ship status. Animation is then ' dependent on the current status.If newTick <= 10 Then
myShipStatus = ShipStatus.SS_LIFTOFF
ElseIf newTick <= midAltitude Then
myShipStatus = ShipStatus.SS_TURNING
Else
myShipStatus = ShipStatus.SS_ENGINEON
EndIfSelectCase myShipStatus
Case ShipStatus.SS_LIFTOFF
yVal += 0.015F
Case ShipStatus.SS_TURNING
yVal += 0.015F
angle = SetRotation(angle, 180F)
Case ShipStatus.SS_ENGINEON
isEngineFired = True
zVal = zVal - 0.04F
yVal = yVal + 0.005F
angle = SetRotation(angle, 180F)
If newTick > midAltitude + 30 Then
isShipDeparted = TrueEndIfEndSelectEndSubPrivateFunction SetRotation(ByVal tempAngle AsSingle, ByVal rotationThreshold AsSingle) AsSingle ' SetRotation manipulates rotation values to simulate a vessel that ' gradually increases in turning speed, and then slows to ' a stop. rotationThreshold should be <= 180 degrees.If isNewRotationOperation Then ' Reset values if this is a new rotation operation. ' Starting angle of ship must be added back in ' before the call to Matrix.RotationY.
tempAngle = 0.1F
isNewRotationOperation = FalseEndIf
rotationThreshold = DegreesToRadians(rotationThreshold)
If tempAngle < rotationThreshold ThenDim increment AsSingle = tempAngle
' Provide a gradual but increasing turning speed.
tempAngle *= 1.015F
lastIncrement = tempAngle - increment
Return tempAngle
Else ' Provide a gradual slowing to a stop.
tempAngle += lastIncrement * 0.75F
lastIncrement = lastIncrement * 0.75F
Return tempAngle
EndIfEndFunctionPrivateFunction DegreesToRadians(ByVal degrees AsSingle) AsSingleDim radians AsSingle = degrees *(3.141593F / 180F)
Return radians
EndFunctionPrivateSub SetupMovingLight()
device.Lights(2).Type = LightType.Point
lightData = device.Lights(2)
device.Lights(2).Diffuse = Color.White
device.Lights(2).Range = 200F
IfNot device.DeviceCaps.VertexProcessingCaps.SupportsPositionalLights ThenIf device.LightsFixed(2).Type = LightType.Point Then
device.LightsFixed(2).Type = LightType.Directional
EndIfEndIf ' Handle positioning for the light that emanates ' from the ship, representing the light from ' the main engines.SelectCase device.Lights(2).Type
Case LightType.Point
device.Lights(2).Position = New Vector3(0, yVal, zVal)
device.Lights(2).Attenuation1 = 0.2F
Case LightType.Directional
EndSelect ' Not implemented.
device.Lights(2).Update()
EndSubSharedSub Main()
TryDim d3dApp AsNew MatrixTransformsHowTo()
System.Windows.Forms.Application.Run(d3dApp)
Catch
MessageBox.Show("Your device does not have the needed 3-D " + "support to run this sample")
Catch
MessageBox.Show("Your device does not have the needed 3-D " + "support to run this sample")
Catch e As Exception
MessageBox.Show("The sample has run into an error and needs" + "to close: " + e.Message)
EndTryEndSubEndClass
using System;
using System.Drawing;
using System.Windows.Forms;
using Microsoft.WindowsMobile.DirectX;
using Microsoft.WindowsMobile.DirectX.Direct3D;
namespace MatrixTransforms
{
class MatrixTransformsHowTo : Form
{
// Mesh representing the ship.
Mesh shipMesh = null;
// Meshes representing buildings.
Mesh[] wallMeshes = new Mesh[3];
Color meshColor = Color.Goldenrod;
// Description of the Direct3D light.private Light lightData;
Device device;
privateenum ShipStatus
{
SS_LIFTOFF = 1,
SS_TURNING = 2,
SS_ENGINEON = 3
}
ShipStatus myShipStatus = ShipStatus.SS_LIFTOFF;
int firstTick = 0;
int newTick = 0;
float yVal = -2.0f;
float zVal = 2.0f;
constint midAltitude = 85;
float yCameraPosition = -1;
float xCameraPosition = -2;
float startAngle = 0.0f;
float angle = 0.1f;
float lastIncrement = 0.0f;
bool isEngineFired = false;
bool isShipDeparted = false;
bool isNewRotationOperation = true;
public MatrixTransformsHowTo()
{
PresentParameters present;
this.Text = "Flying Ship";
// Enable the form to be closed.// Required so that Hwnd of the form changes.this.MinimizeBox = false;
present = new PresentParameters();
present.Windowed = true;
present.AutoDepthStencilFormat = DepthFormat.D16;
present.EnableAutoDepthStencil = true;
present.SwapEffect = SwapEffect.Discard;
device = new Device(0, DeviceType.Default, this,
CreateFlags.None, present);
device.DeviceReset += new EventHandler(OnDeviceReset);
for (int i = 0; i < wallMeshes.Length; i++)
{
wallMeshes[i] = null;
}
OnDeviceReset(null, EventArgs.Empty);
}
privatevoid OnDeviceReset(object sender, EventArgs e)
{
// Meshes must be recreated whenever the device// is reset, no matter which pool they are created in.// Instead of loading a mesh from a file,// this sample uses primitive box meshes// to represent the ship and the buildings.
shipMesh = Mesh.Box(device, .8f, 0.18f, 2.2f);
wallMeshes[0] = Mesh.Box(device, 0.5f, 3.6f, 1.0f);
wallMeshes[1] = Mesh.Box(device, 0.5f, 1.8f, 2.0f);
wallMeshes[2] = Mesh.Box(device, .2f, 1.0f, 0.75f);
device.RenderState.Ambient = Color.White;
// Provides main directional lighting.
device.Lights[0].Type = LightType.Directional;
device.Lights[0].Direction = new Vector3(0.3f, -0.5f, 0.2f);
device.Lights[0].Diffuse = Color.LightBlue;
device.Lights[0].Update();
// Provides frontal lighting.
device.Lights[1].Type = LightType.Directional;
device.Lights[1].Direction = new Vector3(0.0f, -1.0f, -3.0f);
device.Lights[1].Diffuse = Color.DarkSlateGray;
device.Lights[1].Update();
// Turn on the lights.
device.Lights[0].Enabled = true;
device.Lights[1].Enabled = true;
// Turn off the light representing the engine.
device.Lights[2].Enabled = false;
// For the projection matrix, set up a perspective transform (which// transforms geometry from 3-D view space to 2-D viewport space, with// a perspective divide that makes objects smaller in the distance). To build// a perspective transform, you need the field of view (1/4 PI is common),// the aspect ratio, and the near and far clipping planes (which define at// the distances at which geometry should be no longer be rendered).
device.Transform.Projection = Matrix.PerspectiveFovLH((float)Math.PI / 4.0F,
(float)this.ClientSize.Width / (float)this.ClientSize.Height,
1.0f, 80.0f);
}
protectedoverridevoid OnPaintBackground(PaintEventArgs e)
{
// Do nothing.
}
protectedoverridevoid OnPaint(PaintEventArgs e)
{
Material material = new Material();
Material engineMaterial = new Material();
// Begin the scene and clear the back buffer to black.
device.Clear(ClearFlags.Target | ClearFlags.ZBuffer, Color.Black,
1.0f, 0);
device.BeginScene();
material.Diffuse = Color.WhiteSmoke;
// Specifies the ambient color for the engines.
engineMaterial.Ambient = Color.White;
SetupMatrices();
device.Material = material;
// Draw ship on the screen.
shipMesh.DrawSubset(0);
SetupMovingLight();
if (isEngineFired)
{
device.Material = engineMaterial;
device.Lights[2].Enabled = true;
// Bind the vertex buffers of the primitive// mesh to the Device object.
device.SetStreamSource(0, shipMesh.VertexBuffer, 0);
// Redraw the face of the ship representing the engine.// A Box mesh has 4 vertices per face. The 20th vertex// is the first vertex representing the "engine." To use
// adjacent triangles, set the type to Primitive.TriangleFan.
device.DrawPrimitives(PrimitiveType.TriangleFan, 20, 2);
}
material.Diffuse = Color.GhostWhite;
device.Material = material;
// Draw buildings, providing coordinates to locate each// building on the x, y, and z planes. Because the camera is placed// "behind" the scene initially (at a positive z-axis valuein// the call to Matrix.LookAtLH), positive z-axis values draw// objects closer to the camera. In addition, positive x-axis// values draw objects farther to the left instead of to the right.// Draw the tall building.
device.Transform.World = Matrix.Translation(.75f, -0.2f, -2.0f);
wallMeshes[0].DrawSubset(0);
// Draw the medium-sized buildings.
device.Transform.World = Matrix.Translation(-1.0f, -0.9f, 0.0f);
wallMeshes[1].DrawSubset(0);
device.Transform.World = Matrix.Translation(0.0f, -0.9f, 0.0f);
wallMeshes[1].DrawSubset(0);
device.Transform.World = Matrix.Translation(1.0f, -0.9f, 0.0f);
wallMeshes[1].DrawSubset(0);
device.Transform.World = Matrix.Translation(2.0f, -0.9f, 0.0f);
wallMeshes[1].DrawSubset(0);
// Draw the small buildings.
device.Transform.World = Matrix.Translation(-2.0f, -1.5f, 5.0f);
wallMeshes[2].DrawSubset(0);
device.Transform.World = Matrix.Translation(-1.25f, -1.5f, 5.0f);
wallMeshes[2].DrawSubset(0);
device.Transform.World = Matrix.Translation(-0.5f, -1.5f, 5.0f);
wallMeshes[2].DrawSubset(0);
device.Transform.World = Matrix.Translation(0.75f, -1.5f, 5.0f);
wallMeshes[2].DrawSubset(0);
// Finish the scene and present it on the screen.
device.EndScene();
device.Present();
// Repaint the scene.this.Invalidate();
}
privatevoid SetupMatrices()
{
// Set the transformation matrices.float fAngle = angle;
// To render the ship, combine a rotation on the y-axis with a// translation (move) using the Matrix.Multiply method.
device.Transform.World = Matrix.Multiply(Matrix.RotationY(fAngle + startAngle), Matrix.Translation(-0.5f, yVal, zVal));
// Set up the view matrix. You can define a view matrix with a camera position,// a point to look at (camera target), and an "up" direction.
// First vector passed to LookAtLH is the camera position.// Second vector passed to LookAtLH is the camera target.// Third vector passed to LookAtLH defines the "up" direction.
// Here, you set the camera seven units up along the z-axis ("behind"// the scene), down one unit, and left two units. You then point the camera// just above the origin and define "up" to be in the y-direction.
if (!isShipDeparted)
{
device.Transform.View = Matrix.LookAtLH(new Vector3(-2, -1, 7),
new Vector3(0, 1, 0), new Vector3(0, 1, 0));
}
else
{
// Handles movement of camera after // the ship "fires" the main engines.
device.Transform.View = Matrix.LookAtLH(new Vector3(xCameraPosition,
yCameraPosition, 7), new Vector3(0, 1, 0), new Vector3(0, 1, 0));
xCameraPosition += 0.01f;
yCameraPosition += 0.01f;
}
// Use the system time to control the animation.// The high-resolution timer, if present for// the hardware, could be used instead.int tick = System.Environment.TickCount;
if (newTick == 0) { firstTick = tick / 100; }
newTick = (tick / 100) - firstTick + 1;
// Use the tick count to change the current// ship status. Animation is then// dependent on the current status.if (newTick <= 10) { myShipStatus = ShipStatus.SS_LIFTOFF; }
elseif (newTick <= midAltitude) { myShipStatus = ShipStatus.SS_TURNING; }
else { myShipStatus = ShipStatus.SS_ENGINEON; }
switch (myShipStatus)
{
case ShipStatus.SS_LIFTOFF:
yVal += 0.015f;
break;
case ShipStatus.SS_TURNING:
yVal += 0.015f;
angle = SetRotation(angle, 180.0f);
break;
case ShipStatus.SS_ENGINEON:
isEngineFired = true;
zVal = zVal - 0.04f;
yVal = yVal + 0.005f;
angle = SetRotation(angle, 180.0f);
if (newTick > midAltitude + 30) { isShipDeparted = true; }
break;
}
}
privatefloat SetRotation(float tempAngle, float rotationThreshold)
{
// SetRotation manipulates rotation values to simulate a vessel that// gradually increases in turning speed, and then slows to// a stop. rotationThreshold should be <= 180 degrees.if (isNewRotationOperation)
{
// Reset values if this is a new rotation operation.// Starting angle of ship must be added back in// before the call to Matrix.RotationY.
tempAngle = 0.1f;
isNewRotationOperation = false;
}
rotationThreshold = DegreesToRadians(rotationThreshold);
if (tempAngle < rotationThreshold)
{
float increment = tempAngle;
// Provide a gradual but increasing turning speed.
tempAngle *= 1.015f;
lastIncrement = tempAngle - increment;
return tempAngle;
}
else
{
// Provide a gradual slowing to a stop.
tempAngle += (lastIncrement * 0.75f);
lastIncrement = lastIncrement * 0.75f;
return tempAngle;
}
}
privatefloat DegreesToRadians(float degrees)
{
float radians = degrees * (3.141592654f / 180.0f);
return radians;
}
privatevoid SetupMovingLight()
{
device.Lights[2].Type = LightType.Point;
lightData = device.Lights[2];
device.Lights[2].Diffuse = Color.White;
device.Lights[2].Range = 200.0f;
if(!device.DeviceCaps.VertexProcessingCaps.SupportsPositionalLights)
{
if (device.LightsFixed[2].Type == LightType.Point)
device.LightsFixed[2].Type = LightType.Directional;
}
// Handle positioning for the light that emanates// from the ship, representing the light from// the main engines.switch (device.Lights[2].Type)
{
case LightType.Point:
device.Lights[2].Position = new Vector3(0,
yVal, zVal);
device.Lights[2].Attenuation1 = 0.2f;
break;
case LightType.Directional:
// Not implemented.break;
}
device.Lights[2].Update();
}
staticvoid Main()
{
try
{
MatrixTransformsHowTo d3dApp = new MatrixTransformsHowTo();
System.Windows.Forms.Application.Run(d3dApp);
}
catch(NotSupportedException)
{
MessageBox.Show("Your device does not have the needed 3-D " +
"support to run this sample");
}
catch(DriverUnsupportedException)
{
MessageBox.Show("Your device does not have the needed 3-D " +
"support to run this sample");
}
catch(Exception e)
{
MessageBox.Show("The sample has run into an error and needs" +
"to close: " + e.Message);
}
}
}
}
コードのコンパイル方法
この例では、次の名前空間への参照が必要です。
参照
処理手順
方法 : High-Resolution、タイマーを使用します。
概念
.NET コンパクトなフレームワーク方法を説明したトピックの検索