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[Plot] Complete coverage of PlotLineBuffer

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WTD-806.
This commit is contained in:
Victor Woeltjen 2015-04-17 12:26:44 -07:00
parent 6551e9212d
commit 4d34f19aa2
2 changed files with 56 additions and 5 deletions
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15
platform/features/plot/src/elements/PlotLineBuffer.js
View File

@ -44,7 +44,7 @@ define(
// Increase the size of the buffer
function doubleBufferSize() {
var sz = Math.min(maxSize, buffer.length * 2),
var sz = Math.min(maxSize * 2, buffer.length * 2),
canDouble = sz > buffer.length,
doubled = canDouble && new Float32Array(sz);
@ -58,7 +58,7 @@ define(
// Decrease the size of the buffer
function halveBufferSize() {
var sz = Math.max(initialSize, buffer.length / 2),
var sz = Math.max(initialSize * 2, buffer.length / 2),
canHalve = sz < buffer.length;
if (canHalve) {
@ -77,6 +77,13 @@ define(
getBuffer: function () {
return buffer;
},
/**
* Get the number of points stored in this buffer.
* @returns {number} the number of points stored
*/
getLength: function () {
return length;
},
/**
* Remove values from this buffer.
* Normally, values are removed from the start
@ -116,9 +123,7 @@ define(
i;
// Don't allow append after the end; that doesn't make sense
if (index > length) {
index = length;
}
index = Math.min(index, length);
// Resize if necessary
if (sz > free) {

46
platform/features/plot/test/elements/PlotLineBufferSpec.js
View File

@ -52,6 +52,7 @@ define(
expect(
Array.prototype.slice.call(buffer.getBuffer()).slice(0, 12)
).toEqual([ -41, 8, -39, 0, -35, 3, -33, 9, -28, 8, -27, 11]);
expect(buffer.getLength()).toEqual(6);
});
it("finds insertion indexes", function () {
@ -73,6 +74,51 @@ define(
expect(
Array.prototype.slice.call(buffer.getBuffer()).slice(0, 24)
).toEqual(head.concat(head).concat(tail).concat(tail));
expect(buffer.getLength()).toEqual(12);
});
it("allows values to be trimmed from the start", function () {
buffer.trim(2);
expect(buffer.getLength()).toEqual(4);
expect(
Array.prototype.slice.call(buffer.getBuffer()).slice(0, 8)
).toEqual([ -35, 3, -33, 9, -28, 8, -27, 11]);
});
it("ensures a maximum size", function () {
var i;
// Should be able to insert 6 series of 6 points each
// (After that, we'll hit the test max of 40)
for (i = 1; i < 6; i += 1) {
expect(buffer.getLength()).toEqual(6 * i);
expect(buffer.insert(mockSeries, Number.POSITIVE_INFINITY))
.toBeTruthy();
}
// Should be maxed out now
expect(buffer.getLength()).toEqual(36);
expect(buffer.insert(mockSeries, Number.POSITIVE_INFINITY))
.toBeFalsy();
expect(buffer.getLength()).toEqual(36);
});
it("reduces buffer size when space is no longer needed", function () {
// Check that actual buffer is sized to the initial size
// (double TEST_INITIAL_SIZE, since two elements are needed per
// point; one for domain, one for range)
expect(buffer.getBuffer().length).toEqual(20);
// Should have 6 elements now... grow to 24
buffer.insert(mockSeries, Number.POSITIVE_INFINITY);
buffer.insert(mockSeries, Number.POSITIVE_INFINITY);
buffer.insert(mockSeries, Number.POSITIVE_INFINITY);
// This should have doubled the actual buffer size
expect(buffer.getBuffer().length).toEqual(80);
// Remove some values
buffer.trim(20);
// Actual buffer size should have been reduced accordingly
expect(buffer.getBuffer().length).toBeLessThan(80);
});
});