[dygraphs.git] / tests / underlay-callback.html

<!DOCTYPE html>
<html>
  <head>
    <link rel="stylesheet" href="../dist/dygraph.css">
    <title>Custom underlay callback</title>
    <script type="text/javascript" src="../dist/dygraph.js"></script>

    <script type="text/javascript" src="data.js"></script>
  </head>
  <body>
    <p>Should draw a three-colored background, split horizontally at y:2.25, and
    again on the top at x:19Nov:</p>
    <div id="div_g" style="width:600px; height:300px;"></div>

    <div id="status" style="width:100%; height:200px;"></div>

    <script type="text/javascript">
      s = document.getElementById("status");

      g = new Dygraph(
            document.getElementById("div_g"),
            NoisyData, {
              rollPeriod: 7,
              showRoller: true,
              errorBars: true,

              underlayCallback: function(canvas, area, g) {
                // Selecting a date in the middle of the graph. 
                var splitDate = new Date("2006-11-19").getTime();
                var coords = g.toDomCoords(splitDate, 2.25);

                // splitX and splitY are the coordinates on the canvas for (2006-11-19, 2.25).
                var splitX = coords[0];
                var splitY = coords[1];

                // The drawing area doesn't start at (0, 0), it starts at (area.x, area.y).
                // That's why we subtract them from splitX and splitY. This gives us the
                // actual distance from the upper-left hand corder of the graph itself.
                var leftSideWidth = splitX - area.x;
                var rightSideWidth = area.w - leftSideWidth;
                var topHeight = splitY - area.y;
                var bottomHeight = area.h - topHeight;

                // fillRect(x, y, width, height)
                // Top section: y = (2.25, +Infinity)
                // left: (x < 2006-11-19)
                canvas.fillStyle = 'lightblue';
                canvas.fillRect(area.x, area.y, leftSideWidth, topHeight);

                // right: (x > 2006-11-19)
                canvas.fillStyle = 'orange';
                canvas.fillRect(splitX, area.y, rightSideWidth, topHeight);
        
                // Bottom section: y = (-Infinity, 2.25)
                canvas.fillStyle = 'pink';
                canvas.fillRect(area.x, splitY, area.w, bottomHeight);
              }
            }
          );
    </script>
  </body>
</html>
Commit	Line	Data
54425b14	1	<!DOCTYPE html>
e7746234 EC	2	<html>
e7746234 EC	3	<head>
fd6b8dad	4	<link rel="stylesheet" href="../dist/dygraph.css">
e7746234	5	<title>Custom underlay callback</title>
fbd6834a	6	<script type="text/javascript" src="../dist/dygraph.js"></script>
7e5ddc94	7
e7746234 EC	8	<script type="text/javascript" src="data.js"></script>
	9	</head>
	10	<body>
c7371f01 RK	11	<p>Should draw a three-colored background, split horizontally at y:2.25, and
c7371f01 RK	12	again on the top at x:19Nov:</p>
e7746234 EC	13	<div id="div_g" style="width:600px; height:300px;"></div>
	14
	15	<div id="status" style="width:100%; height:200px;"></div>
	16
	17	<script type="text/javascript">
	18	s = document.getElementById("status");
	19
	20	g = new Dygraph(
	21	document.getElementById("div_g"),
	22	NoisyData, {
	23	rollPeriod: 7,
	24	showRoller: true,
	25	errorBars: true,
	26
04143109	27	underlayCallback: function(canvas, area, g) {
fdcf1ce4 RK	28	// Selecting a date in the middle of the graph.
fdcf1ce4 RK	29	var splitDate = new Date("2006-11-19").getTime();
5879c20d	30	var coords = g.toDomCoords(splitDate, 2.25);
04143109	31
5879c20d	32	// splitX and splitY are the coordinates on the canvas for (2006-11-19, 2.25).
fdcf1ce4 RK	33	var splitX = coords[0];
	34	var splitY = coords[1];
	35
5879c20d RK	36	// The drawing area doesn't start at (0, 0), it starts at (area.x, area.y).
	37	// That's why we subtract them from splitX and splitY. This gives us the
	38	// actual distance from the upper-left hand corder of the graph itself.
	39	var leftSideWidth = splitX - area.x;
	40	var rightSideWidth = area.w - leftSideWidth;
	41	var topHeight = splitY - area.y;
	42	var bottomHeight = area.h - topHeight;
2fc82862	43
fdcf1ce4	44	// fillRect(x, y, width, height)
2fc82862	45	// Top section: y = (2.25, +Infinity)
5879c20d	46	// left: (x < 2006-11-19)
e7746234	47	canvas.fillStyle = 'lightblue';
5879c20d	48	canvas.fillRect(area.x, area.y, leftSideWidth, topHeight);
fdcf1ce4	49
5879c20d	50	// right: (x > 2006-11-19)
fdcf1ce4 RK	51	canvas.fillStyle = 'orange';
	52	canvas.fillRect(splitX, area.y, rightSideWidth, topHeight);
	53
	54	// Bottom section: y = (-Infinity, 2.25)
	55	canvas.fillStyle = 'pink';
	56	canvas.fillRect(area.x, splitY, area.w, bottomHeight);
e7746234 EC	57	}
	58	}
	59	);
	60	</script>
	61	</body>
	62	</html>