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115 lines
3.3 KiB
115 lines
3.3 KiB
/**
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*
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*/
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var QuickSort = function(Visualizer) {
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this.swaps = 0;
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this.comparisons = 0;
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this.V = Visualizer;
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this.V
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.instruct(this.V.message, 0, 2, 'Swaps: ' + this.swaps)
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.instruct(this.V.message, 0, 1, 'Comparisons: ' + this.comparisons);
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};
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QuickSort.prototype = Object.create(Sorter.prototype);
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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(this.V.highlight, 500, end)
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// .instruct(this.V.message, 0, 3, 'Start: ' + start)
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// .instruct(this.V.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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var rval;
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this.V
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.instruct(this.V.marker, 0, 1, left, 'L')
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.instruct(this.V.marker, 0, 2, right, 'R')
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.instruct(this.V.showMarker, 0, 1)
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.instruct(this.V.showMarker, 0, 2)
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.instruct(this.V.unhighlight, 0)
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.instruct(this.V.highlight, 0, pivot)
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.instruct(this.V.message, 0, 3, 'Sorting from [' + start + '] to [' + end + ']')
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.instruct(this.V.message, 0, 4, '')
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.instruct(this.V.message, 100, 5, '');
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while (left <= right) {
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this.V.instruct(this.V.message, 0, 4, '');
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this.V.instruct(this.V.message, 0, 5, '');
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while (arr[left].value < pivotval) {
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this.comparisons++;
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this.V
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.instruct(this.V.message, 0, 4, `${arr[left].value} < ${pivotval}, increment left` )
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.instruct(this.V.message, 0, 1, `Comparisons: ${this.comparisons}`)
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.instruct(this.V.marker, 500, 1, left);
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left++;
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}
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this.V
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.instruct(this.V.message, 0, 4, `Left stop: ${arr[left].value} >= ${pivotval}`)
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.instruct(this.V.marker, 500, 1, left);
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while (arr[right].value > pivotval) {
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this.comparisons++;
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this.V
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.instruct(this.V.message, 0, 5, `${arr[right].value} < ${pivotval}, decrement right`)
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.instruct(this.V.message, 0, 1, 'Comparisons: ' + this.comparisons)
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right--;
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this.V.instruct(this.V.marker, 500, 2, right)
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}
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this.V.instruct(this.V.message, 100, 5, `Right stop: ${arr[right].value} <= ${pivotval} `)
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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.V.instruct(this.V.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.V
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.instruct(this.V.message, 0, 2, 'Swaps: ' + this.swaps)
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.instruct(this.V.message, 0, 4, 'Incremement left...')
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.instruct(this.V.message, 0, 5, 'Decrement right...')
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.instruct(this.V.marker, 100, 1, left)
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.instruct(this.V.marker, 100, 2, right)
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}
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}
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this.V
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.instruct(this.V.unhighlight, 0)
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.instruct(this.V.hideMarker, 0, 1)
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.instruct(this.V.hideMarker, 0, 2)
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.instruct(this.V.message, 0, 3, 'Sorting complete.')
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.instruct(this.V.message, 0, 4, '')
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.instruct(this.V.message, 0, 5, '');
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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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