我对ZedGraph有一点不同的要求。
我想在用户点击ZedGraph窗格时在ZedGraph窗格上创建曲线。此外,我在该窗格上绘制了其他图表。但我希望每当用户点击zedGraph区域时,我们就会得到用户点击的坐标,并在点击的坐标上绘制一条直线。
我使用了FindNearestObject方法的MouseCLick事件alren,如下所示:
private void zedGraph_RenderedTrack_MouseClick(object sender, EventArgs e)
{
MouseEventArgs xx = (MouseEventArgs)e;
object nearestObject;
int index;
this.zedGraph_RenderedTrack.GraphPane.FindNearestObject(new PointF(xx.X, xx.Y), this.CreateGraphics(), out nearestObject, out index);
if (nearestObject != null)
{
DrawALine(xx.X, Color.Red, true);
}
}
但是使用这个,ZedGraph搜索一些曲线并找到最近的点,然后绘制线条,但我希望在用户点击的地方绘制线条。有没有办法这样做?
答案 0 :(得分:5)
您可以尝试以下代码,这将为鼠标点击事件绘制一条垂直线。
public Form1()
{
InitializeComponent();
}
PointPairList userClickrList = new PointPairList();
LineItem userClickCurve = new LineItem("userClickCurve");
private void zedGraphControl1_MouseClick(object sender, MouseEventArgs e)
{
// Create an instance of Graph Pane
GraphPane myPane = zedGraphControl1.GraphPane;
// x & y variables to store the axis values
double xVal;
double yVal;
// Clear the previous values if any
userClickrList.Clear();
myPane.Legend.IsVisible = false;
// Use the current mouse locations to get the corresponding
// X & Y CO-Ordinates
myPane.ReverseTransform(e.Location, out xVal, out yVal);
// Create a list using the above x & y values
userClickrList.Add(xVal, myPane.YAxis.Scale.Max);
userClickrList.Add(xVal, myPane.YAxis.Scale.Min);
// Add a curve
userClickCurve = myPane.AddCurve(" ", userClickrList, Color.Red, SymbolType.None);
zedGraphControl1.Refresh();
}
您只需更改userClickList即可绘制水平线。
快乐编码..... :)