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[Plot] Expand range to give margin for points

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Expand range to give some margin for points near the edge,
WTD-1406.
This commit is contained in:
Victor Woeltjen 2015-06-29 17:44:44 -07:00
parent fa8095d5bc
commit 397a545482
2 changed files with 31 additions and 4 deletions
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19
platform/features/plot/src/elements/PlotUpdater.js
View File

@ -31,6 +31,7 @@ define(
'use strict';
var MAX_POINTS = 86400,
PADDING_RATIO = 0.10, // Padding percentage for top & bottom
INITIAL_SIZE = 675; // 1/128 of MAX_POINTS
/**
@ -135,6 +136,16 @@ define(
return extrema[0];
}
// Expand range slightly so points near edges are visible
function expandRange() {
var padding = PADDING_RATIO * dimensions[1],
top;
padding = Math.max(padding, 1.0);
top = Math.ceil(origin[1] + dimensions[1] + padding / 2);
origin[1] = Math.floor(origin[1] - padding / 2);
dimensions[1] = top - origin[1];
}
// Update dimensions and origin based on extrema of plots
function updateBounds() {
if (bufferArray.length > 0) {
@ -147,11 +158,13 @@ define(
}).reduce(reduceExtrema);
// Calculate best-fit dimensions
dimensions = (rangeExtrema[0] === rangeExtrema[1]) ?
[dimensionsOf(domainExtrema), 2.0 ] :
[dimensionsOf(domainExtrema), dimensionsOf(rangeExtrema)];
dimensions =
[dimensionsOf(domainExtrema), dimensionsOf(rangeExtrema)];
origin = [originOf(domainExtrema), originOf(rangeExtrema)];
// Enforce some minimum visible area
expandRange();
// ...then enforce a fixed duration if needed
if (fixedDuration !== undefined) {
origin[0] = origin[0] + dimensions[0] - fixedDuration;

16
platform/features/plot/test/elements/PlotUpdaterSpec.js
View File

@ -187,7 +187,21 @@ define(
expect(updater.getDomainOffset()).toBeDefined();
});
it("provides some margin for the range", function () {
var mockObject = mockSubscription.getTelemetryObjects()[0];
mockSeries.getPointCount.andReturn(3);
mockSeries.getDomainValue.andCallFake(function (i) {
return 1000 + i * 1000;
});
mockSeries.getRangeValue.andCallFake(function (i) {
return 10 + i; // 10, 20, 30
});
updater.addHistorical(mockObject, mockSeries);
expect(updater.getOrigin()[1]).toBeLessThan(10);
expect(updater.getDimensions()[1]).toBeGreaterThan(20);
});
});
}
);
);