X-Git-Url: https://adrianiainlam.tk/git/?a=blobdiff_plain;f=gallery%2Finteraction-api.js;fp=gallery%2Finteraction-api.js;h=38a5b687240cc1755838bee0563e2223cfab358f;hb=abfadf4c33d50d5b8f0ec97ea94c2ff60e6db38a;hp=0000000000000000000000000000000000000000;hpb=d0d1f76beeadb9f41d0194cf689ea93c4987a565;p=dygraphs.git

diff --git a/gallery/interaction-api.js b/gallery/interaction-api.js
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+++ b/gallery/interaction-api.js
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+// Code for a variety of interaction models. Used in interaction.html, but split out from
+// that file so they can be tested in isolation.
+//
+function downV3(event, g, context) {
+  context.initializeMouseDown(event, g, context);
+  if (event.altKey || event.shiftKey) {
+    Dygraph.startZoom(event, g, context);
+  } else {
+    Dygraph.startPan(event, g, context);
+  }
+}
+
+function moveV3(event, g, context) {
+  if (context.isPanning) {
+    Dygraph.movePan(event, g, context);
+  } else if (context.isZooming) {
+    Dygraph.moveZoom(event, g, context);
+  }
+}
+
+function upV3(event, g, context) {
+  if (context.isPanning) {
+    Dygraph.endPan(event, g, context);
+  } else if (context.isZooming) {
+    Dygraph.endZoom(event, g, context);
+  }
+}
+
+// Take the offset of a mouse event on the dygraph canvas and
+// convert it to a pair of percentages from the bottom left. 
+// (Not top left, bottom is where the lower value is.)
+function offsetToPercentage(g, offsetX, offsetY) {
+  // This is calculating the pixel offset of the leftmost date.
+  var xOffset = g.toDomCoords(g.xAxisRange()[0], null)[0];
+  var yar0 = g.yAxisRange(0);
+
+  // This is calculating the pixel of the higest value. (Top pixel)
+  var yOffset = g.toDomCoords(null, yar0[1])[1];
+
+  // x y w and h are relative to the corner of the drawing area,
+  // so that the upper corner of the drawing area is (0, 0).
+  var x = offsetX - xOffset;
+  var y = offsetY - yOffset;
+
+  // This is computing the rightmost pixel, effectively defining the
+  // width.
+  var w = g.toDomCoords(g.xAxisRange()[1], null)[0] - xOffset;
+
+  // This is computing the lowest pixel, effectively defining the height.
+  var h = g.toDomCoords(null, yar0[0])[1] - yOffset;
+
+  // Percentage from the left.
+  var xPct = w == 0 ? 0 : (x / w);
+  // Percentage from the top.
+  var yPct = h == 0 ? 0 : (y / h);
+
+  // The (1-) part below changes it from "% distance down from the top"
+  // to "% distance up from the bottom".
+  return [xPct, (1-yPct)];
+}
+
+function dblClickV3(event, g, context) {
+  // Reducing by 20% makes it 80% the original size, which means
+  // to restore to original size it must grow by 25%
+  var percentages = offsetToPercentage(g, event.offsetX, event.offsetY);
+  var xPct = percentages[0];
+  var yPct = percentages[1];
+
+  if (event.ctrlKey) {
+    zoom(g, -.25, xPct, yPct);
+  } else {
+    zoom(g, +.2, xPct, yPct);
+  }
+}
+
+var lastClickedGraph = null;
+
+function clickV3(event, g, context) {
+  lastClickedGraph = g;
+  Dygraph.cancelEvent(event);
+}
+
+function scrollV3(event, g, context) {
+  if (lastClickedGraph != g) {
+    return;
+  }
+  var normal = event.detail ? event.detail * -1 : event.wheelDelta / 40;
+  // For me the normalized value shows 0.075 for one click. If I took
+  // that verbatim, it would be a 7.5%.
+  var percentage = normal / 50;
+
+  var percentages = offsetToPercentage(g, event.offsetX, event.offsetY);
+  var xPct = percentages[0];
+  var yPct = percentages[1];
+
+  zoom(g, percentage, xPct, yPct);
+  Dygraph.cancelEvent(event);
+}
+
+// Adjusts [x, y] toward each other by zoomInPercentage%
+// Split it so the left/bottom axis gets xBias/yBias of that change and
+// tight/top gets (1-xBias)/(1-yBias) of that change.
+//
+// If a bias is missing it splits it down the middle.
+function zoom(g, zoomInPercentage, xBias, yBias) {
+  xBias = xBias || 0.5;
+  yBias = yBias || 0.5;
+  function adjustAxis(axis, zoomInPercentage, bias) {
+    var delta = axis[1] - axis[0];
+    var increment = delta * zoomInPercentage;
+    var foo = [increment * bias, increment * (1-bias)];
+    return [ axis[0] + foo[0], axis[1] - foo[1] ];
+  }
+  var yAxes = g.yAxisRanges();
+  var newYAxes = [];
+  for (var i = 0; i < yAxes.length; i++) {
+    newYAxes[i] = adjustAxis(yAxes[i], zoomInPercentage, yBias);
+  }
+
+  g.updateOptions({
+    dateWindow: adjustAxis(g.xAxisRange(), zoomInPercentage, xBias),
+    valueRange: newYAxes[0]
+    });
+}
+
+var v4Active = false;
+var v4Canvas = null;
+
+function downV4(event, g, context) {
+  context.initializeMouseDown(event, g, context);
+  v4Active = true;
+  moveV4(event, g, context); // in case the mouse went down on a data point.
+}
+
+var processed = [];
+
+function moveV4(event, g, context) {
+  var RANGE = 7;
+
+  if (v4Active) {
+    var canvasx = Dygraph.pageX(event) - Dygraph.findPosX(g.graphDiv);
+    var canvasy = Dygraph.pageY(event) - Dygraph.findPosY(g.graphDiv);
+
+    var rows = g.numRows();
+    // Row layout:
+    // [date, [val1, stdev1], [val2, stdev2]]
+    for (var row = 0; row < rows; row++) {
+      var date = g.getValue(row, 0);
+      var x = g.toDomCoords(date, null)[0];
+      var diff = Math.abs(canvasx - x);
+      if (diff < RANGE) {
+        for (var col = 1; col < 3; col++) {
+          // TODO(konigsberg): these will throw exceptions as data is removed.
+          var vals =  g.getValue(row, col);
+          if (vals == null) { continue; }
+          var val = vals[0];
+          var y = g.toDomCoords(null, val)[1];
+          var diff2 = Math.abs(canvasy - y);
+          if (diff2 < RANGE) {
+            var found = false;
+            for (var i in processed) {
+              var stored = processed[i];
+              if(stored[0] == row && stored[1] == col) {
+                found = true;
+                break;
+              }
+            }
+            if (!found) {
+              processed.push([row, col]);
+              drawV4(x, y);
+            }
+            return;
+          }
+        }
+      }
+    }
+  }
+}
+
+function upV4(event, g, context) {
+  if (v4Active) {
+    v4Active = false;
+  }
+}
+
+function dblClickV4(event, g, context) {
+  restorePositioning(g);
+}
+
+function drawV4(x, y) {
+  var ctx = v4Canvas;
+
+  ctx.strokeStyle = "#000000";
+  ctx.fillStyle = "#FFFF00";
+  ctx.beginPath();
+  ctx.arc(x,y,5,0,Math.PI*2,true);
+  ctx.closePath();
+  ctx.stroke();
+  ctx.fill();
+}
+
+function captureCanvas(canvas, area, g) {
+  v4Canvas = canvas;
+}
+
+function restorePositioning(g) {
+  g.updateOptions({
+    dateWindow: null,
+    valueRange: null
+  });
+}