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  • VB.Net 经典画圆方法

    计算机图形学课程作业-----画圆

    Public Class Form1

        Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

            Dim G As Graphics = PictureBox1.CreateGraphics()

            Dim Br As SolidBrush = New SolidBrush(Color.Blue)

            Dim x0, y0, r, x, y As Integer

            Dim d As Integer

            d = 3 - 2 * r

            x0 = Val(TextBox1.Text) : y0 = Val(TextBox2.Text) : r = Val(TextBox3.Text)

            x = 0 : y = r

            Do While x <= y

                G.FillRectangle(Br, x0 + x, y0 + y, 1, 1)

                G.FillRectangle(Br, x0 + y, y0 + x, 1, 1)

                G.FillRectangle(Br, x0 - x, y0 - y, 1, 1)

                G.FillRectangle(Br, x0 - y, y0 - x, 1, 1)

                G.FillRectangle(Br, x0 - x, y0 + y, 1, 1)

                G.FillRectangle(Br, x0 - y, y0 + x, 1, 1)

                G.FillRectangle(Br, x0 + x, y0 - y, 1, 1)

                G.FillRectangle(Br, x0 + y, y0 - x, 1, 1)

                If d < 0 Then

                    d = d + 4 * x + 6

                Else

                    d = d + 4 * (x - y) + 10

                    y = y - 1

                End If

                x = x + 1

            

        End Sub

        Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

            Me.Refresh()

        End Sub

        Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

            End

        End Sub

        Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

            TextBox1.Text = 150 : TextBox2.Text = 200 : TextBox3.Text = 100

        End Sub

    End Class

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  • 原文地址:https://www.cnblogs.com/jordonin/p/3171995.html
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