歌词文件解析(二):LRC格式文件的绘制

　　通过对LRC文件的解析,可以轻松实现歌词可视化.

paintLyrics(ByVal pBox As PictureBox, ByVal CurrentPosition As Integer, ByVal type As Boolean, Optional ByVal pLyric As LyricClass = Nothing)

参数：

pBox:用于绘制歌词的Picturebox

CurrentPosition:当前歌词的时间进度,单位为秒(Second)

type:值为True时强行绘制歌词

pLyric:可选参数,要绘制的歌词类(LyricClass)

功能：

1.歌词居中显示

2.自动匹配显示行数

3.当前歌词突出显示

  ‘绘制歌词
    Public Sub paintLyrics(ByVal pBox As PictureBox, ByVal CurrentPosition As Integer, ByVal type As Boolean, Optional ByVal pLyric As LyricClass = Nothing)
        Dim stringFormat As New StringFormat() With {.LineAlignment = StringAlignment.Center, .Alignment = StringAlignment.Center}
        Dim tempI, tempII, pWidth, pHeight As Integer
        Dim myfont As Font
        Dim mybrush As SolidBrush
        Dim bmp As Bitmap
        For i = 0 To LyricData.Count - 1
            If CurrentPosition * 100 > LyricData.LyricTime(LyricData.Count - 1 - i) Then
                tempII = LyricData.Count - 1 - i
                Exit For
            End If
            tempII = -1
        Next
        If Not tempII = tempI Or type = True Then
            If pLyric Is Nothing Then pLyric = Me
            tempI = tempII
            myfont = New Font("微软雅黑", 16)
            mybrush = New SolidBrush(Color.FromArgb(158, 0, 0, 0))
            pWidth = pBox.Width : pHeight = pBox.Height
            bmp = New Bitmap(pWidth, pHeight)
            Dim pg As Graphics = Graphics.FromImage(bmp)
            pg.TextRenderingHint = Drawing.Text.TextRenderingHint.AntiAlias
            For i = 0 To pHeight ‘绘制渐变背景
                pg.DrawLine(New Pen(Color.FromArgb(10 + Math.Abs(i / (pHeight / 255) - 128), 0, 0, 0), 1), 0, i, pWidth, i)
            Next
            If pLyric.LyricData.Count = 0 Then
                pg.DrawString("未找到歌词", myfont, mybrush, pWidth / 2, pHeight / 2, stringFormat)
            Else
                For i = 1 To pHeight / 80
                    If tempI - i >= 0 Then pg.DrawString(pLyric.LyricData.LyricString(tempI - i), myfont, mybrush, pWidth / 2, pHeight / 2 - i * 40, stringFormat)
                    If tempI + i <= pLyric.LyricData.Count - 1 Then pg.DrawString(pLyric.LyricData.LyricString(tempI + i), myfont, mybrush, pWidth / 2, pHeight / 2 + i * 40, stringFormat)
                Next
                myfont = New Font("微软雅黑", 18)
                mybrush = New SolidBrush(Color.FromArgb(218, 0, 0, 0))
                If tempI >= 0 And tempI <= pLyric.LyricData.Count - 1 Then pg.DrawString(pLyric.LyricData.LyricString(tempI), myfont, mybrush, pWidth / 2, pHeight / 2, stringFormat)
            End If
            pBox.Image = bmp
            pg.Dispose()
        End If
    End Sub