定义好三角形的三个点，用line画线连接即可。
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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
运行效果：
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
Dim a, b, c, s, p As Single
a = Val(InputBox("请输入三角形边长a"))
b = Val(InputBox("请输入三角形边长b"))
c = Val(InputBox("请输入三角形边长c"))
If a + b = c Or b + c = a Or c + a = b Then
MsgBox("这样的三角形不存在")
Else
If a = b Or b = c Or c = a Then
MsgBox("这是一个等腰三角形")
End If
If a = b = c Then
MsgBox("这是一个等边三角形")
End If
If a ^ 2 + b ^ 2 = c ^ 2 Or b ^ 2 + c ^ 2 = a ^ 2 Or c ^ 2 + a ^ 2 = b ^ 2 Then
MsgBox("这是一个直角三角形")
End If
p = (a + b + c) / 2
s = Math.Sqrt(p * (p - a) * (p - b) * (p - c))
MsgBox("这个三角形的面积是" s)
End If
End Sub
VB系统的坐标原点在左上角，X轴的正方向是水平向右，而Y轴的正方向是垂直向下。所以，要绘制三角函数的曲线，自己可以通过改变点坐标的方法来实现，当然，VB.NET提供了相应的方法可以来实现坐标变换，也可以通过VB.Net的Graphics类提供的平移、旋转等转换来实现。
下面是我通过自己变换实现的示例，提供参考；我的环境是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，获得一个Graphics对象
Dim MyGraphics As Graphics
MyGraphics = PictureBox1.CreateGraphics
'2，定义一个Pen对象，用于绘制图形（轮廓线）
Dim MyPen As New Pen(Color.Black, 1)
'3，定义一个Brush对象，用于填充图形（如果需要填充的话）
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，获得一个Graphics对象
Dim MyGraphics As Graphics
MyGraphics = PictureBox1.CreateGraphics
'2，定义一个Pen对象，用于绘制图形（轮廓线）
Dim MyPen As New Pen(Color.Black, 1)
'3，定义一个Brush对象，用于填充图形（如果需要填充的话）
Dim MyBrush As New SolidBrush(Color.Orange)
'声明横向和纵向比例变量
Dim Heng As Integer = 20
Dim Zong As Integer = 50
'先获得正弦值，保存到点坐标数组
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
'采用绘制光滑线连接点的方式绘制曲线
MyGraphics.DrawCurve(MyPen, MyPoints)
End Sub
End Class
显示的效果图：
Public Class Form1
Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
Dim n As Integer, i As Integer, j As Integer, a(,) As Integer
n = 10
ReDim a(n + 1, n + 1)
For i = 1 To n + 1
a(i, 1) = 1 : a(i, i) = 1 : Next i
For i = 3 To n + 1
For j = 2 To i - 1
a(i, j) = a(i - 1, j - 1) + a(i - 1, j)
Next j, i
For i = 1 To n + 1
For j = 1 To i
TextBox1.AppendText(Space(4 - Len(Trim(Str(a(i, j))))) Trim(Str(a(i, j))))
Next j
TextBox1.AppendText(vbCrLf)
Next i
End Sub
End Class,9,
xixihahano1 举报
谢谢了，但是你写的代码可以输出多少行？多久会溢出了
举报 ccddty
没试过，你可以试试，将n的值加大 当n》16的时候就显示“参数“Number”必须大于或等于 0。”了 有没有办法解决？,
