form0804.frm

VB实验教程源码

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "绘制饼图"
   ClientHeight    =   3255
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   5520
   LinkTopic       =   "Form1"
   ScaleHeight     =   3255
   ScaleWidth      =   5520
   StartUpPosition =   3  '窗口缺省
   Begin VB.PictureBox Picture1 
      Height          =   2535
      Left            =   2760
      ScaleHeight     =   2475
      ScaleWidth      =   2355
      TabIndex        =   6
      Top             =   360
      Width           =   2415
   End
   Begin VB.Frame Frame1 
      Caption         =   "输人数"
      Height          =   2775
      Left            =   360
      TabIndex        =   0
      Top             =   240
      Width           =   2055
      Begin VB.TextBox Text4 
         Height          =   270
         Left            =   1200
         TabIndex        =   10
         Top             =   1800
         Width           =   615
      End
      Begin VB.TextBox Text3 
         Height          =   270
         Left            =   1200
         TabIndex        =   8
         Top             =   1320
         Width           =   615
      End
      Begin VB.TextBox Text2 
         Height          =   270
         Left            =   1200
         TabIndex        =   5
         Top             =   840
         Width           =   615
      End
      Begin VB.CommandButton Command1 
         Caption         =   "画饼图"
         Height          =   375
         Left            =   480
         TabIndex        =   4
         Top             =   2280
         Width           =   975
      End
      Begin VB.TextBox Text1 
         Height          =   270
         Left            =   1200
         TabIndex        =   1
         Top             =   360
         Width           =   615
      End
      Begin VB.Label Label4 
         Caption         =   "不及格"
         Height          =   255
         Left            =   240
         TabIndex        =   9
         Top             =   1800
         Width           =   735
      End
      Begin VB.Label Label3 
         Caption         =   "及格"
         Height          =   255
         Left            =   240
         TabIndex        =   7
         Top             =   1320
         Width           =   735
      End
      Begin VB.Label Label2 
         Caption         =   "良"
         Height          =   255
         Left            =   240
         TabIndex        =   3
         Top             =   840
         Width           =   735
      End
      Begin VB.Label Label1 
         Caption         =   "优"
         Height          =   255
         Left            =   240
         TabIndex        =   2
         Top             =   360
         Width           =   735
      End
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Private Sub Command1_Click()
'单击画饼图按钮
    Const PI = 3.1415926
    Dim x1 As Single, y1 As Single, z1 As Single, w1 As Single
    Dim x As Single, y As Single, z As Single, w As Single
    Dim r As Single, MidX As Single, MidY As Single
    Dim Sum As Single
    Picture1.FillStyle = 0 '设置填充式样
    x1 = Val(Text1.Text)
    y1 = Val(Text2.Text)
    z1 = Val(Text3.Text)
    w1 = Val(Text4.Text)
    Sum = x1 + y1 + z1 + w1
    '计算百分比
    x = x1 / Sum
    y = y1 / Sum
    z = z1 / Sum
    w = w1 / Sum
    '计算图片框的中心点位置
    MidX = Picture1.Width / 2
    MidY = Picture1.Height / 2
    r = Picture1.Width / 2 - 300
    If x <> 0 And y <> 0 And z <> 0 Then
    '画四色椭圆
        Picture1.FillColor = vbRed
        Picture1.Circle (MidX, MidY), r, , -2 * PI, -2 * PI * x, 2 / 3
        Picture1.FillColor = vbYellow
        Picture1.Circle (MidX, MidY), r, , -2 * PI * x, -2 * PI * (x + y), 2 / 3
        Picture1.FillColor = vbBlue
        Picture1.Circle (MidX, MidY), r, , -2 * PI * (x + y), -2 * PI * (x + y + z), 2 / 3
        Picture1.FillColor = vbGreen
        Picture1.Circle (MidX, MidY), r, , -2 * PI * (x + y + z), -2 * PI, 2 / 3
    End If
End Sub