定義好三角形的三個點,用line畫線連接即可。
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示例如下:
Private?Sub?Form_Load()
Me.AutoRedraw?=?True
Dim?x?As?Integer
Dim?y?As?Integer
CurrentX?=?1500
CurrentY?=?500
Line?-(3000,?2000),?RGB(0,?0,?255)
Line?-(1500,?2000),?RGB(0,?0,?255)
Line?-(1500,?500),?RGB(0,?0,?255)
End?Sub
運行效果:
有幾個地方要注意:
1、VB中的三角函數(shù)的角度全部是用弧度制表示的,如果是度數(shù)的話,應(yīng)先乘以180再除以π轉(zhuǎn)成弧度,再用函數(shù)計算結(jié)果。
2、VB中直接支持的三角函數(shù)有:Sin()、Cos()、Tan(),如果涉及到其它三角函數(shù),可以從下面列出的代碼中自己選擇相應(yīng)的函數(shù):
Function
Sec(X)
As
Double
'正割
Sec
=
1
/
Cos(Angle)
End
Function
Function
Csc(X)
As
Double
'余割
Csc
=
1
/
Sin(Angle)
End
Function
Function
Cot(X)
As
Double
'余切
Cot
=
1
/
Tan(Angle)
End
Function
Function
ArcSin(X)
As
Double
'反正弦
ArcSin
=
Atn(X
/
Sqr(-X
*
X
+
1))
End
Function
Function
ArcCos(X)
As
Double
'反余弦
ArcCos
=
Atn(-X
/
Sqr(-X
*
X
+
1))
+
2
*
Atn(1)
End
Function
Function
ArcSec(X)
As
Double
'反正割
ArcSec
=
Atn(X
/
Sqr(X
*
X
-
1))
+
Sgn((X)
-
1)
*
(2
*
Atn(1))
End
Function
Function
ArcCsc(X)
As
Double
'反余割
ArcCsc
=
Atn(X
/
Sqr(X
*
X
-
1))
+
(Sgn(X)
-
1)
*
(2
*
Atn(1))
End
Function
Function
ArcCot(X)
As
Double
'反余切
ArcCot
=
Atn(X)
+
2
*
Atn(1)
End
Function
Function
HSin(X)
As
Double
'雙曲正弦
HSin
=
(Exp(X)
-
Exp(-X))
/
2
End
Function
Function
HCos(X)
As
Double
'雙曲余弦
HCos
=
(Exp(X)
+
Exp(-X))
/
2
End
Function
Function
HTan(X)
As
Double
'雙曲正切
HTan
=
(Exp(X)
-
Exp(-X))
/
(Exp(X)
+
Exp(-X))
End
Function
Function
HSec(X)
As
Double
'雙曲正割
HSec
=
2
/
(Exp(X)
+
Exp(-X))
End
Function
Function
HCsc(X)
As
Double
'雙曲余割
HCsc
=
2
/
(Exp(X)
-
Exp(-X))
End
Function
Function
HCot(X)
As
Double
'雙曲余切
HCot
=
(Exp(X)
+
Exp(-X))
/
(Exp(X)
-
Exp(-X))
End
Function
Function
HArcsin(X)
As
Double
'反雙曲正弦
HArcsin
=
Log(X
+
Sqr(X
*
X
+
1))
End
Function
Function
HArccos(X)
As
Double
'反雙曲余弦
HArccos
=
Log(X
+
Sqr(X
*
X
-
1))
End
Function
Function
HArctan(X)
As
Double
'反雙曲正切
HArctan
=
Log((1
+
X)
/
(1
-
X))
/
2
End
Function
Function
HArcsec(X)
As
Double
'反雙曲正割
HArcsec
=
Log((Sqr(-X
*
X
+
1)
+
1)
/
X)
End
Function
Function
HArccsc(X)
As
Double
'反雙曲余割
HArccsc
=
Log((Sgn(X)
*
Sqr(X
*
X
+
1)
+
1)
/
X)
End
Function
Function
HArccot(X)
As
Double
'反雙曲余切
HArccot
=
Log((X
+
1)
/
(X
-
1))
/
2
End
Function
Imports System.Drawing
Imports System.Drawing.Drawing2D
Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Dim g As Graphics = PictureBox1.CreateGraphics
Dim hs As HatchStyle = HatchStyle.Cross
Dim sb As HatchBrush = New HatchBrush(hs, Color.Black, Color.White)
Dim p(3) As Point
p(0).X = 100
p(0).Y = 50
p(1).X = 0
p(1).Y = 100
p(2).X = 200
p(2).Y = 100
p(3).X = 100
p(3).Y = 50
g.FillPolygon(sb, p)
g.DrawPolygon(Pens.Black, p)
End Sub
End Class
VB系統(tǒng)的坐標(biāo)原點在左上角,X軸的正方向是水平向右,而Y軸的正方向是垂直向下。所以,要繪制三角函數(shù)的曲線,自己可以通過改變點坐標(biāo)的方法來實現(xiàn),當(dāng)然,VB.NET提供了相應(yīng)的方法可以來實現(xiàn)坐標(biāo)變換,也可以通過VB.Net的Graphics類提供的平移、旋轉(zhuǎn)等轉(zhuǎn)換來實現(xiàn)。
下面是我通過自己變換實現(xiàn)的示例,提供參考;我的環(huán)境是VB.NET 2010
Imports System.Math
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
? '1,獲得一個Graphics對象
? Dim MyGraphics As Graphics
? MyGraphics = PictureBox1.CreateGraphics
? '2,定義一個Pen對象,用于繪制圖形(輪廓線)
? Dim MyPen As New Pen(Color.Black, 1)
? '3,定義一個Brush對象,用于填充圖形(如果需要填充的話)
? Dim MyBrush As New SolidBrush(Color.Orange)
? MyGraphics.DrawLine(MyPen, 0, 200, 700, 200)
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
? '1,獲得一個Graphics對象
? Dim MyGraphics As Graphics
? MyGraphics = PictureBox1.CreateGraphics
? '2,定義一個Pen對象,用于繪制圖形(輪廓線)
? Dim MyPen As New Pen(Color.Black, 1)
? '3,定義一個Brush對象,用于填充圖形(如果需要填充的話)
? Dim MyBrush As New SolidBrush(Color.Orange)
? '聲明橫向和縱向比例變量
? Dim Heng As Integer = 20
? Dim Zong As Integer = 50
? '先獲得正弦值,保存到點坐標(biāo)數(shù)組
? Dim MyPoints(700) As Point
? Dim i As Integer
? For i = 0 To 700
? ? ? MyPoints(i) = New Point(i * Heng, 200 + Sin(i) * Zong)
? Next
? '采用繪制光滑線連接點的方式繪制曲線
? MyGraphics.DrawCurve(MyPen, MyPoints)
End Sub
End Class
顯示的效果圖:
Const pi = 3.141593
Private Sub Form_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
Randomize
r = 1000 * Rnd
d = 10 * Rnd
Me.Line (X, Y)-(X + r * Cos(pi / d), Y + r * Sin(pi / d))
Me.Line -(X - r * Cos(pi / d), Y + r * Sin(pi / d))
Me.Line -(X, Y)
End Sub
給出(x,y,z)????
平面圖形,哪來的z坐標(biāo)?
如果點不在三角形內(nèi)呢?
原點你定義在哪呢??
分享標(biāo)題:vb.net畫三角實例的簡單介紹
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