//缩放绘图范围，以当前鼠标所在的坐标为缩放的中心
public void OnCanvasMouseWheel(MouseEventArgs e)
{
int ex = e.X - Left, ey = e.Y - Top;
PointF wpos = ScreenToWorld(ex, ey);
//控制Graphics矩阵的缩放
if (e.Delta > 0)
{
--m_ScaleStepIndex;
if (m_ScaleStepIndex < 0)
{
m_ScaleStepIndex = 0;
}
m_GridScale = m_ScaleStep[m_ScaleStepIndex];
}
else
{
++m_ScaleStepIndex;
if (m_ScaleStepIndex > 18)
{
m_ScaleStepIndex = 18;
}
m_GridScale = m_ScaleStep[m_ScaleStepIndex];
}
m_OffsetX = -(int)(wpos.X / m_GridScale + Width * 0.5f - ex);
m_OffsetY = -(int)(wpos.Y / -m_GridScale + Height * 0.5f - ey);
PointF lt = ScreenToWorld(0, 0);
PointF rb = ScreenToWorld(Width, Height);
m_View = new WorldSpaceRect(lt.X, lt.Y, rb.X, rb.Y);
Invalidate();
}
//检测点pt是否在线段AB上
public static bool IsPointOnLine(PointF pt, PointF start, PointF end)
{
WorldSpaceRect rect = new WorldSpaceRect(start, end);
rect.Regular();
if (!rect.Contains(pt.X, pt.Y))
{
return(false);
}
PointF pa = new PointF(pt.X - start.X, pt.Y - start.Y);
PointF ab = new PointF(end.X - start.X, end.Y - start.Y);
float ma = (float)Math.Sqrt(pa.X * pa.X + pa.Y * pa.Y);
pa.X /= ma; pa.Y /= ma;
float mb = (float)Math.Sqrt(ab.X * ab.X + ab.Y * ab.Y);
ab.X /= mb; ab.Y /= mb;
float dot = pa.X * ab.X + pa.Y * ab.Y;
//0.9962f表示允许5°的误差
if (Math.Abs(dot) < 0.9962f)
{
return(false);
}
return(true);
}
//控件大小发生改变时的处理
protected override void OnSizeChanged(EventArgs e)
{
base.OnSizeChanged(e);
if (Width == 0 || Height == 0)
{
return;
}
m_Canvas = new Bitmap(Width, Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
PointF lt = ScreenToWorld(0, 0);
PointF rb = ScreenToWorld(Width, Height);
m_View = new WorldSpaceRect(lt.X, lt.Y, rb.X, rb.Y);
Invalidate();
}
//添加时间轴对象，添加时会自动按照时间先后进行一次排序
public void ShowStream(TimelineStreams item)
{
//需要Item按照时间排序
m_Stream = item;
if (item.GetStreamCount() == 4)
{
m_ScaleStepIndex = 6;
m_GridScale = m_ScaleStep[m_ScaleStepIndex];
}
else
{
m_ScaleStepIndex = 10;
m_GridScale = m_ScaleStep[m_ScaleStepIndex];
}
PointF lt = ScreenToWorld(0, 0);
PointF rb = ScreenToWorld(Width, Height);
m_View = new WorldSpaceRect(lt.X, lt.Y, rb.X, rb.Y);
Invalidate();
}
public TimeGrid()
{
InitializeComponent();
m_ScaleStep = new float[20];
for (int i = 0; i < 20; i += 2)
{
m_ScaleStep[i] = 0.00002f * (float)Math.Pow(10, i / 2) / 2;
m_ScaleStep[i + 1] = 0.00002f * (float)Math.Pow(10, i / 2);
}
m_ScaleStepIndex = 10;
m_GridScale = m_ScaleStep[m_ScaleStepIndex];
m_GridSize = 50;
m_Canvas = new Bitmap(1, 1, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
m_X = m_Y = 0;
m_OffsetX = m_OffsetY = 0;
PointF lt = ScreenToWorld(0, 0);
PointF rb = ScreenToWorld(Width, Height);
m_View = new WorldSpaceRect(lt.X, lt.Y, rb.X, rb.Y);
//----------------------------------------------------------------------------------------
m_CurrentKeyPointIndex = -1;
m_CurrentStreamIndex = -1;
m_Tooltip = "";
}
//平移图像，或者平移选中的操作手柄
protected override void OnMouseMove(MouseEventArgs e)
{
if (e.Button == MouseButtons.Right)
{
//控制Graphics矩阵的平移
m_OffsetX += e.X - m_X;
m_OffsetY += e.Y - m_Y;
m_X = e.X;
m_Y = e.Y;
PointF lt = ScreenToWorld(0, 0);
PointF rb = ScreenToWorld(Width, Height);
m_View = new WorldSpaceRect(lt.X, lt.Y, rb.X, rb.Y);
Invalidate();
}
else if (e.Button == MouseButtons.Left)
{
//如果当前有选中的操作器，则将上下移动映射到改变操作器的值
if (m_CurrentKeyPoint != null)
{
PointF pt = ScreenToWorld(e.X, e.Y);
m_CurrentKeyPoint.SetValue((uint)m_CurrentStreamIndex, pt.Y);
{
//如果允许修改时间,但是不能超过左右两侧
m_CurrentKeyPoint.Time = pt.X;
List <KeyPoint> list = m_Stream.GetStream();
//不能小于左侧
if (m_CurrentKeyPointIndex > 0)
{
KeyPoint kp = list[m_CurrentKeyPointIndex - 1];
if (kp.Time > pt.X)
{
m_CurrentKeyPoint.Time = kp.Time;
}
}
if (m_CurrentKeyPointIndex < list.Count - 1)
{
KeyPoint kp = list[m_CurrentKeyPointIndex + 1];
if (kp.Time < pt.X)
{
m_CurrentKeyPoint.Time = kp.Time;
}
}
}
m_Stream.Update(m_CurrentKeyPoint);
m_Tooltip = "(";
m_Tooltip += pt.X.ToString(); m_Tooltip += ","; m_Tooltip += pt.Y.ToString(); m_Tooltip += ")";
m_TooltipX = e.X;
m_TooltipY = e.Y;
Invalidate();
}
else
{
//控制Graphics矩阵的平移
m_OffsetX += e.X - m_X;
m_OffsetY += e.Y - m_Y;
m_X = e.X;
m_Y = e.Y;
PointF lt = ScreenToWorld(0, 0);
PointF rb = ScreenToWorld(Width, Height);
m_View = new WorldSpaceRect(lt.X, lt.Y, rb.X, rb.Y);
m_Tooltip = "";
Invalidate();
}
}
else
{
if (m_Tooltip.Length > 0)
{
m_Tooltip = "";
Invalidate();
}
}
if (TooltipDelegate != null)
{
PointF pt = ScreenToWorld(e.X, e.Y);
string text;
text = "(";
text += pt.X.ToString(); text += ","; text += pt.Y.ToString(); text += ")";
TooltipDelegate(text);
}
base.OnMouseMove(e);
}
