Question

我想创建点，然后将它们存储在数组中。我这样做是为了对数据点进行线性回归。所以我需要能够遍历我所有的观点。

我无法在网络上找到类似的东西进行处理，而且由于我实际上做不到，因此需要您的帮助。这是我的方法，但似乎不起作用：

ArrayList<dataPoint> dataPoints = new ArrayList<dataPoint>();

void setup(){
  size(1000, 1000); 
  background(255);
}
void draw(){
  for (int i = 1; i == dataPoints.size(); i++) { 
    // An ArrayList doesn't know what it is storing so we have to cast the object coming out
    dataPoint Point = dataPoints.get(i);
    Point.display();

  }  
}

void mousePressed() {
  dataPoints.add(new dataPoint(mouseX, mouseY));
}

class dataPoint {

  float x;
  float y;

  dataPoint(int tempX, int tempY) {
    x = tempX;
    y = tempY;
  }

  void display() {
    strokeWeight(10);
    stroke(255,0,0);
    point(x,y);
  }
}

我想要一个程序来创建点并将其存储在数组中（或类似的东西，您可以循环遍历）。

Answer 1

您的大多数代码都有意义，我只能发现两个陷阱，它们可能会阻止您遍历所有点并将其可视化：

您的条件是将超出范围的数组索引：试试for (int i = 0; i < dataPoints.size(); i++)
请记住要清除边框，否则您将一遍又一遍地画在相同的点上

在Processing / Java中，请记住数组索引从0开始（同样，最后一个索引将不是数组的size()，而是数组的<，因此少了1，因此，for条件中的ArrayList<dataPoint> dataPoints = new ArrayList<dataPoint>(); void setup(){ size(1000, 1000); } void draw(){ background(255); for (int i = 0; i < dataPoints.size(); i++) { // An ArrayList doesn't know what it is storing so we have to cast the object coming out dataPoint Point = dataPoints.get(i); Point.display(); } } void mousePressed() { dataPoints.add(new dataPoint(mouseX, mouseY)); } class dataPoint { float x; float y; dataPoint(int tempX, int tempY) { x = tempX; y = tempY; } void display() { strokeWeight(10); stroke(255,0,0); point(x,y); } }） / p>

这是经过上述调整的代码：

    <script src="<?php echo base_url(); ?>assets/fullcalendar/lib/moment.min.js"></script>
    <script src="<?php echo base_url(); ?>assets/fullcalendar/lib/jquery-ui.min.js"></script>
    <script src="<?php echo base_url(); ?>assets/fullcalendar/lib/jquery.min.js"></script>
    <link rel="stylesheet" href="<?php echo base_url(); ?>assets/fullcalendar/fullcalendar.min.css" />
    <script src="<?php echo base_url(); ?>assets/fullcalendar/fullcalendar.min.js"></script>
    <script src="<?php echo base_url(); ?>assets/fullcalendar-3.9.0/locale/es.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

</head>
<body>

<div class="container">
<div class="row">
<div class="col-md-12">

<h1>Calendar</h1>

<div id="calendar">

    <div class="modal fade" id="addModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel">
      <div class="modal-dialog" role="document">
        <div class="modal-content">
          <div class="modal-header">
            <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
            <h4 class="modal-title" id="myModalLabel">Add Calendar Event</h4>
          </div>
          <div class="modal-body">
          <?php echo form_open(site_url('calendar/add_event'), array("class" => "form-horizontal")) ?>
          <div class="form-group">
                    <label for="p-in" class="col-md-4 label-heading">Event Name</label>
                    <div class="col-md-8 ui-front">
                        <input type="text" class="form-control" name="name" value="">
                    </div>
            </div>
            <div class="form-group">
                    <label for="p-in" class="col-md-4 label-heading">Description</label>
                    <div class="col-md-8 ui-front">
                        <input type="text" class="form-control" name="description">
                    </div>
            </div>
            <div class="form-group">
                    <label for="p-in" class="col-md-4 label-heading">Start Date</label>
                    <div class="col-md-8">
                        <input type="text" class="form-control" name="start_date">
                    </div>
            </div>
            <div class="form-group">
                    <label for="p-in" class="col-md-4 label-heading">End Date</label>
                    <div class="col-md-8">
                        <input type="text" class="form-control" name="end_date">
                    </div>
            </div>
          </div>
          <div class="modal-footer">
            <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
            <input type="submit" class="btn btn-primary" value="Add Event">
            <?php echo form_close() ?>
          </div>
        </div>
      </div>
    </div>

</div>
</div>
</div>
</div>



<!--<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>-->
<script type="text/javascript">
    $(document).ready(function() {
    var date_last_clicked + null;
    $('#calendar').fullCalendar({

       eventSources: [
         {
             events: function(start, end, timezone, callback) {
                 $.ajax({
                 url: '<?php echo base_url() ?>calendar/get_events',
                 dataType: 'json',
                 data: {
                 // our hypothetical feed requires UNIX timestamps
                 start: start.unix(),
                 end: end.unix()
                 },
                 success: function(msg) {
                     var events = msg.events;
                     callback(events);
                 }
                 });
             }
         },
     ]
                 dayClick: function(date, jsEvent, view) {
                    date_last_clicked = $(this);
                    $(this).css('background-color', '#bed7f3');
                    $('#addModal').modal();
                    },            

    });
    });
</script>
<style>
        #calendar{
            width: 800px;
            margin: 0px auto;
        }
</style>


</body>

如何创建点，显示它们并将它们存储在某种数组中

1 个答案: