public void TestDraw()
{
var helper = new PianoDraw()
{
BoxWidth = 200,
BoxHeight = 200,
BlackKeyHeight = 50,
WhiteKeyHeight = 100,
WhiteKeyWidth = 60,
BlackKeyWidth = 30,
Min = PianoKey.Create127(0),
Max = PianoKey.Create127(131),
Offset = -61
};
var key = helper.Get(0);
Assert.AreEqual(key.ToKey127(), (byte)1);
}
/// <summary>
/// 这是获取当前位置
/// </summary>
/// <param name="offset"></param>
/// <param name="isRelative">是否是相对坐标</param>
/// <returns></returns>
public PianoKey Get(double offset, bool isRelative = true)
{
Invalidate();
if (isRelative)
{
offset += Offset;
}
if (IsVertical)
{
offset = BarLength - offset;
}
if (IsSameGap)
{
return(PianoKey.Create127(Convert.ToInt32(offset / BlackKeyWidth)
- (IsVertical ? 1 : 0)));
}
var w = WhiteKeyWidth;
var index = offset / w;
var key = new PianoKey
{
Beat = Convert.ToInt16(index / 7 - 4),
Code = Convert.ToUInt16(index % 7 + 1)
};
if (key.ToKey127() > 0)
{
var pre = key - 1;
if (pre.Scale > 0 && GetOffsetFromMin(pre) + BlackKeyWidth > offset)
{
return(pre);
}
}
var next = key + 1;
if (next.Scale > 0 && GetOffsetFromMin(next) <= offset)
{
return(next);
}
return(key);
}
