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

<!DOCTYPE html>
<html>
  <head>
    <title>Custom underlay callback</title>
    <!--[if IE]>
    <script type="text/javascript" src="../excanvas.js"></script>
    <![endif]-->
    <script type="text/javascript" src="../strftime/strftime-min.js"></script>
    <script type="text/javascript" src="../rgbcolor/rgbcolor.js"></script>
    <script type="text/javascript" src="../dygraph-canvas.js"></script>
    <script type="text/javascript" src="../dygraph.js"></script>
    <script type="text/javascript" src="data.js"></script>
  </head>
  <body>
    <p>Should draw a two-colored background, split horizontally at 2.25:</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>
	3	<head>
	4	<title>Custom underlay callback</title>
	5	<!--[if IE]>
a2b2c3a1	6	<script type="text/javascript" src="../excanvas.js"></script>
e7746234	7	<![endif]-->
d37dca40 DV	8	<script type="text/javascript" src="../strftime/strftime-min.js"></script>
d37dca40 DV	9	<script type="text/javascript" src="../rgbcolor/rgbcolor.js"></script>
e7746234 EC	10	<script type="text/javascript" src="../dygraph-canvas.js"></script>
	11	<script type="text/javascript" src="../dygraph.js"></script>
	12	<script type="text/javascript" src="data.js"></script>
	13	</head>
	14	<body>
	15	<p>Should draw a two-colored background, split horizontally at 2.25:</p>
	16	<div id="div_g" style="width:600px; height:300px;"></div>
	17
	18	<div id="status" style="width:100%; height:200px;"></div>
	19
	20	<script type="text/javascript">
	21	s = document.getElementById("status");
	22
	23	g = new Dygraph(
	24	document.getElementById("div_g"),
	25	NoisyData, {
	26	rollPeriod: 7,
	27	showRoller: true,
	28	errorBars: true,
	29
04143109	30	underlayCallback: function(canvas, area, g) {
fdcf1ce4 RK	31	// Selecting a date in the middle of the graph.
fdcf1ce4 RK	32	var splitDate = new Date("2006-11-19").getTime();
5879c20d	33	var coords = g.toDomCoords(splitDate, 2.25);
04143109	34
5879c20d	35	// splitX and splitY are the coordinates on the canvas for (2006-11-19, 2.25).
fdcf1ce4 RK	36	var splitX = coords[0];
	37	var splitY = coords[1];
	38
5879c20d RK	39	// The drawing area doesn't start at (0, 0), it starts at (area.x, area.y).
	40	// That's why we subtract them from splitX and splitY. This gives us the
	41	// actual distance from the upper-left hand corder of the graph itself.
	42	var leftSideWidth = splitX - area.x;
	43	var rightSideWidth = area.w - leftSideWidth;
	44	var topHeight = splitY - area.y;
	45	var bottomHeight = area.h - topHeight;
2fc82862	46
fdcf1ce4	47	// fillRect(x, y, width, height)
2fc82862	48	// Top section: y = (2.25, +Infinity)
5879c20d	49	// left: (x < 2006-11-19)
e7746234	50	canvas.fillStyle = 'lightblue';
5879c20d	51	canvas.fillRect(area.x, area.y, leftSideWidth, topHeight);
fdcf1ce4	52
5879c20d	53	// right: (x > 2006-11-19)
fdcf1ce4 RK	54	canvas.fillStyle = 'orange';
	55	canvas.fillRect(splitX, area.y, rightSideWidth, topHeight);
	56
	57	// Bottom section: y = (-Infinity, 2.25)
	58	canvas.fillStyle = 'pink';
	59	canvas.fillRect(area.x, splitY, area.w, bottomHeight);
e7746234 EC	60	}
	61	}
	62	);
	63	</script>
	64	</body>
	65	</html>