Question

我在c＃windows应用程序上有一个图表。当鼠标放在它们上面时，我想缩放图表的每个点。像谷歌地图

我的意思是我不想放大图表的所有部分我想缩放像谷歌地图一样的特殊点

代码：

public partial class Form1 : Form
    {

        int[] myArrayX = new int[5];
        double[] myArrayY = new double[5];
        int lastX = -1;
        double lastY = -0.6;
        double xmax;

        Graph.Chart chart;
        public Form1()
        {
            InitializeComponent();
            this.MouseWheel += new MouseEventHandler(Form1_MouseWheel);
        }

        void Form1_MouseWheel(object sender, MouseEventArgs e)
        {

            try
            {
                if (e.Delta > 0)
                {
                    double xMin = chart.ChartAreas["draw"].AxisX.ScaleView.ViewMinimum;
                    double xMax = chart.ChartAreas["draw"].AxisX.ScaleView.ViewMaximum;
                    double yMin = chart.ChartAreas["draw"].AxisY.ScaleView.ViewMinimum;
                    double yMax = chart.ChartAreas["draw"].AxisY.ScaleView.ViewMaximum;

                    double posXStart = chart.ChartAreas["draw"].AxisX.PixelPositionToValue(e.Location.X) - (xMax - xMin) / 2;
                    double posXFinish = chart.ChartAreas["draw"].AxisX.PixelPositionToValue(e.Location.X) + (xMax - xMin) / 2;
                    double posYStart = chart.ChartAreas["draw"].AxisY.PixelPositionToValue(e.Location.Y) - (yMax - yMin) / 2;
                    double posYFinish = chart.ChartAreas["draw"].AxisY.PixelPositionToValue(e.Location.Y) + (yMax - yMin) / 2;

                    chart.ChartAreas["draw"].AxisX.ScaleView.Zoom(posXStart, posXFinish);
                    chart.ChartAreas["draw"].AxisY.ScaleView.Zoom(posYStart, posYFinish);
                }
                else if (e.Delta < 0)
                {
                    ZoomOut();
                }

            }
            catch { }


        }

        private void ZoomOut()
        {
            chart.ChartAreas["draw"].AxisX.ScaleView.ZoomReset();
            chart.ChartAreas["draw"].AxisY.ScaleView.ZoomReset();
        }



        void CreateNewGraph()
        {
            // Create new Graph
            chart = new Graph.Chart();


            chart.Location = new System.Drawing.Point(13, 185);


            chart.Size = new System.Drawing.Size(900, 500);


            chart.ChartAreas.Add("draw");




            chart.ChartAreas["draw"].AxisX.Minimum = 0;
            chart.ChartAreas["draw"].AxisX.Maximum = 20;


            chart.ChartAreas["draw"].AxisX.Interval = 1;


            chart.ChartAreas["draw"].AxisX.MajorGrid.LineColor = Color.White;


            chart.ChartAreas["draw"].AxisX.MajorGrid.LineDashStyle = Graph.ChartDashStyle.Dash;


            chart.ChartAreas["draw"].AxisY.Minimum = -0.4;
            chart.ChartAreas["draw"].AxisY.Maximum = 1;


            chart.ChartAreas["draw"].AxisY.Interval = 0.2;


            chart.ChartAreas["draw"].AxisY.MajorGrid.LineColor = Color.White;


            chart.ChartAreas["draw"].AxisY.MajorGrid.LineDashStyle = Graph.ChartDashStyle.Dash;


            chart.ChartAreas["draw"].BackColor = Color.Black;



            var series = chart.Series.Add("Test");


            chart.Series["Test"].ChartType = Graph.SeriesChartType.Line;


            chart.Series["Test"].Color = Color.Yellow;


            chart.Series["Test"].BorderWidth = 3;


            chart.Legends.Add("MyLegend");
            chart.Legends["MyLegend"].BorderColor = Color.YellowGreen;

            // Set automatic zooming
            chart.ChartAreas["draw"].AxisX.ScaleView.Zoomable = true;
            chart.ChartAreas["draw"].AxisY.ScaleView.Zoomable = true;

            // Set automatic scrolling 
            chart.ChartAreas["draw"].CursorX.AutoScroll = true;
            chart.ChartAreas["draw"].CursorY.AutoScroll = true;

            // Allow user selection for Zoom
            chart.ChartAreas["draw"].CursorX.IsUserSelectionEnabled = true;
            chart.ChartAreas["draw"].CursorY.IsUserSelectionEnabled = true;

            chart.ChartAreas["draw"].AxisX.ScaleView.Zoomable = true;
            chart.ChartAreas["draw"].AxisY.ScaleView.Zoomable = true;

            //chart.MouseWheel += new MouseEventHandler(chart_MouseWheel);
        }


        private void Form1_Load(object sender, EventArgs e)
        {
            CreateNewGraph();
        }

        private void timer1_Tick(object sender, EventArgs e)
        {
            fillarray();

            for (int i = 1; i <= 5; i += 1)
            {
                chart.Series["Test"].Points.AddXY(myArrayX[i - 1], myArrayY[i - 1]);
                xmax = myArrayX[i - 1];
            }

            if (xmax >= 20)
            {
                chart.ChartAreas["draw"].AxisX.ScrollBar.Enabled = true;
                chart.ChartAreas["draw"].AxisX.ScaleView.Zoomable = true;
                chart.ChartAreas["draw"].AxisX.ScaleView.Zoom(0, xmax);
            }

            Controls.Add(this.chart);

        }

        public void fillarray()
        {
            for (int i = 1; i <= 5; i += 1)
            {
                lastX = lastX + 1;
                myArrayX[i - 1] = lastX;

            }

            for (int i = 1; i < 5; i += 1)
            {
                lastY = lastY + 0.2;
                myArrayY[i - 1] = lastY;

            }


        }
    }

Answer 1

假设您使用＆＃34;标准＆＃34; （自.NET 4.0起）Charting Lib位于命名空间System.Windows.Forms.DataVisualization.Charting中。您可以实现自定义交互（当鼠标执行此操作时进行缩放）。 MSDN是一个良好的开端和GIYF。

http://msdn.microsoft.com/en-us/library/dd456772(v=vs.110).aspx

网络上还有很多examples。

祝你好运！

用鼠标悬停图表中的每个点

1 个答案: