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[Plot] Complete specs for plot updater

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Complete specs for plot updater; particularly, address
case (and fix bug in case) where maximum buffer size
has been hit. WTD-751.
This commit is contained in:
Victor Woeltjen
2015-02-03 10:35:03 -08:00
parent ed0e0709c5
commit 494cce9b2f
2 changed files with 59 additions and 7 deletions
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13
platform/features/plot/src/elements/PlotUpdater.js
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@ -21,7 +21,7 @@ define(
* @param {string} domain the key to use when looking up domain values
* @param {string} range the key to use when looking up range values
*/
function PlotUpdater(subscription, domain, range) {
function PlotUpdater(subscription, domain, range, maxPoints) {
var max = [Number.NEGATIVE_INFINITY, Number.NEGATIVE_INFINITY],
min = [Number.POSITIVE_INFINITY, Number.POSITIVE_INFINITY],
x,
@ -46,12 +46,12 @@ define(
// Check if we don't have enough room
if (index > (buffer.length / 2 - 1)) {
// If we don't, can we expand?
if (index < MAX_POINTS) {
if (index < maxPoints) {
// Double the buffer size
buffer = buffers[id] = doubleSize(buffer);
} else {
// Just shift the existing buffer
buffer.copyWithin(0, 2);
buffer.set(buffer.subarray(2));
}
}
@ -82,12 +82,12 @@ define(
// Ensure there is space for the new buffer
buffer = ensureBufferSize(buffer, id, index);
// Account for shifting that may have occurred
index = Math.min(index, MAX_POINTS - 2);
index = Math.min(index, maxPoints - 1);
// Update the buffer
buffer[index * 2] = domainValue - domainOffset;
buffer[index * 2 + 1] = rangeValue;
// Update length
lengths[id] = Math.min(index + 1, MAX_POINTS);
lengths[id] = Math.min(index + 1, maxPoints);
// Observe max/min range values
max[1] = Math.max(max[1], rangeValue);
min[1] = Math.min(min[1], rangeValue);
@ -130,6 +130,9 @@ define(
bufferArray.push(buffers[id]);
}
// Use a default MAX_POINTS if none is provided
maxPoints = maxPoints || MAX_POINTS;
// Initially prepare state for these objects.
// Note that this may be an empty array at this time,
// so we also need to check during update cycles.