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94 lines
2.6 KiB
94 lines
2.6 KiB
/**
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*
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*/
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var QuickSort = function() {
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this.instructions = [];
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this.swaps = 0;
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this.comparisons = 0;
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};
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QuickSort.prototype = Object.create(Sorter.prototype);
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QuickSort.prototype.instruct = function() {
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this.instructions.push(arguments);
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return this;
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};
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// NOTE adds to an instruction set
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/**
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*
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*/
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QuickSort.prototype.sort = function(arr, start, end) {
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if (end - start <= 0) {
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// this//.instruct('highlight', 500, end)
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// .instruct('message', 0, 3, 'Start: ' + start)
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// .instruct('message', 0, 4, 'End: ' + end)
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return arr;
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}
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var left = start;
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var right = end;
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var pivot = Math.floor((right + left) / 2);
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var pivotval = arr[pivot].value;
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var tmp;
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this//.instruct('initSection', left, right)
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.instruct('showMarker', 0, 1)
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.instruct('marker', 0, 1, left, 'L')
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.instruct('message', 0, 3, 'Left: ' + left)
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.instruct('showMarker', 0, 2)
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.instruct('marker', 0, 2, right, 'R')
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.instruct('message', 0, 4, 'Right: ' + right)
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.instruct('unhighlight')
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.instruct('highlight', 100, pivot)
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.instruct('message', 0, 5, 'Pivot value: ' + pivotval + ', pivot index: ' + pivot);
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while (left <= right) {
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while (arr[left].value < pivotval) {
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left++;
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this.comparisons++;
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this.instruct('marker', 100, 1, left)
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.instruct('message', 0, 3, 'Left: ' + left)
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.instruct('message', 0, 1, 'Comparisons: ' + this.comparisons)
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}
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while (arr[right].value > pivotval) {
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right--;
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this.comparisons++;
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this.instruct('marker', 100, 2, right)
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.instruct('message', 0, 4, 'Right: ' + right)
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.instruct('message', 0, 1, 'Comparisons: ' + this.comparisons)
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}
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if (left <= right) {
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tmp = arr[left];
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arr[left] = arr[right];
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arr[right] = tmp;
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this.instruct('swap', 500, left, right);
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left++;
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right--;
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this.swaps++;
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this.instruct('message', 0, 2, 'Swaps: ' + this.swaps)
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.instruct('marker', 100, 1, left)
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.instruct('message', 0, 3, 'Left: ' + left)
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.instruct('marker', 100, 2, right)
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.instruct('message', 0, 4, 'Right: ' + right);
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}
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}
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this.instruct('unhighlight', 0)
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.instruct('hideMarker', 0, 1)
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.instruct('hideMarker', 0, 2);
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this.sort(arr, start, right);
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this.sort(arr, left, end);
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return arr;
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};
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