/// <summary>
/// 获取鼠标点击时的坐标(界面—>点),并排序
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void CurveControl_MouseDown(object sender, MouseEventArgs e)
{
if (e.X < _workRect.Left || e.X > _workRect.Right || e.Y > _workRect.Bottom || e.Y < _workRect.Top)
{
return;
}
//左键按下时新增控制点
if (e.Button == MouseButtons.Left)
{
//判断路径是否包含鼠标点，包含则将选中点赋给当前点，不包含则重新出创建当前点
foreach (PixelControlPoint pt in _pixelControlPoints)
{
if (pt.Path.IsVisible(e.X, e.Y))
{
_currentPixelPoint = pt;
return;
}
}
AddControlPoint(e.X, e.Y);
}
//右键按下时删除控制点
if (e.Button == MouseButtons.Right)
{
DeleteControlPoint(e.X, e.Y);
}
}
/// <summary>
/// 鼠标弹起时设置当前值为空
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void CurveControl_MouseUp(object sender, MouseEventArgs e)
{
if (_currentPixelPoint != null)
{
_currentPixelPoint = null;
}
Invalidate();
}
/// <summary>
/// 创建当前控制点
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
private void CreatCurrentPoint(int x, int y)
{
_currentPixelPoint = new PixelControlPoint();
_currentPixelPoint.Location = new Point(x, y);
GraphicsPath path = new GraphicsPath();
path.AddEllipse(_currentPixelPoint.Location.X - POINT_RADIUS, _currentPixelPoint.Location.Y - POINT_RADIUS, POINT_RADIUS << 1, POINT_RADIUS << 1);
_currentPixelPoint.Path = path;
}
private void InitControlPointList()
{
PixelControlPoint beginPoint = new PixelControlPoint();
beginPoint.Location = new Point(OFFSET + BLANK, Height - OFFSET - BLANK);
PixelControlPoint endPoint = new PixelControlPoint();
endPoint.Location = new Point(ClientRectangle.Right - BLANK, BLANK);
_pixelControlPoints.Add(beginPoint);
_pixelControlPoints.Add(endPoint);
}
/// <summary>
/// 鼠标拖动
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void CurveControl_MouseMove(object sender, MouseEventArgs e)
{
//鼠标没有按下时，当鼠标放在已有控制点上方时，将鼠标位置传给当前点；
if (e.Button == System.Windows.Forms.MouseButtons.None)
{
foreach (PixelControlPoint pt in _pixelControlPoints)
{
if (pt.Path == null)
{
continue;
}
if (pt.Path.IsVisible(e.X, e.Y))
{
_currentPixelPoint = pt;
Invalidate();
return;
}
}
_currentPixelPoint = null;
Invalidate();
return;
}
//当鼠标已经按下时，设置鼠标拖动的效果
if (_currentPixelPoint != null)
{
//判断按下时选中的点是否为两个端点，是则x值不变，y改变（只能上下拖动）；否则重新赋值给当前值
if (_pixelControlPoints[0] == _currentPixelPoint || _pixelControlPoints[_pixelControlPoints.Count - 1] == _currentPixelPoint)
{
if (e.Y < _workRect.Bottom && e.Y > _workRect.Top)
{
_currentPixelPoint.Location.Y = e.Y;
}
}
else
{
if (e.X > _workRect.Left && e.X < _workRect.Right && e.Y < _workRect.Bottom && e.Y > _workRect.Top)
{
_currentPixelPoint.Location.X = e.X;
_currentPixelPoint.Location.Y = e.Y;
}
}
_pixelControlPoints.Sort(new PixelControlPointXComparer());
Invalidate();
TryApply();
}
}
/// <summary>
/// 删除控制点
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
internal void DeleteControlPoint(int x, int y)
{
foreach (PixelControlPoint pt in _pixelControlPoints)
{
if (pt.Path.IsVisible(x, y))
{
if (_pixelControlPoints[0] == pt || _pixelControlPoints[_pixelControlPoints.Count - 1] == pt)
{
return;
}
_pixelControlPoints.Remove(pt);
_currentPixelPoint = pt;
break;
}
}
CreatCurrentPoint(x, y);
_pixelControlPoints.Sort(new PixelControlPointXComparer());
Invalidate();
TryApply();
}