523 行
16 KiB
JavaScript
523 行
16 KiB
JavaScript
// Copyright 2011 David Galles, University of San Francisco. All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other materials
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// provided with the distribution.
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//
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// THIS SOFTWARE IS PROVIDED BY <COPYRIGHT HOLDER> ``AS IS'' AND ANY EXPRESS OR IMPLIED
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// WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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// FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> OR
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// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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// ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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// ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// The views and conclusions contained in the software and documentation are those of the
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// authors and should not be interpreted as representing official policies, either expressed
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// or implied, of the University of San Francisco
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function DPFib(am, w, h)
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{
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this.init(am, w, h);
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}
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DPFib.prototype = new Algorithm();
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DPFib.prototype.constructor = DPFib;
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DPFib.superclass = Algorithm.prototype;
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DPFib.TABLE_ELEM_WIDTH = 40;
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DPFib.TABLE_ELEM_HEIGHT = 30;
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DPFib.TABLE_START_X = 500;
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DPFib.TABLE_START_Y = 40;
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DPFib.TABLE_DIFF_X = 100;
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DPFib.CODE_START_X = 10;
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DPFib.CODE_START_Y = 10;
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DPFib.CODE_LINE_HEIGHT = 14;
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DPFib.RECURSIVE_START_X = 20;
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DPFib.RECURSIVE_START_Y = 120;
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DPFib.RECURSIVE_DELTA_Y = 14;
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DPFib.RECURSIVE_DELTA_X = 15;
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DPFib.CODE_HIGHLIGHT_COLOR = "#FF0000";
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DPFib.CODE_STANDARD_COLOR = "#000000";
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DPFib.TABLE_INDEX_COLOR = "#0000FF"
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DPFib.CODE_RECURSIVE_1_COLOR = "#339933";
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DPFib.CODE_RECURSIVE_2_COLOR = "#0099FF";
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DPFib.MAX_VALUE = 20;
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DPFib.MESSAGE_ID = 0;
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DPFib.prototype.init = function(am, w, h)
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{
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DPFib.superclass.init.call(this, am, w, h);
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this.nextIndex = 0;
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this.addControls();
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this.code = [["def ","fib(n)",":"],
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[" if ","(n <= 1) "],
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[" return 1"],
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[" else"],
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[" return ", "fib(n-1)", " + ", "fib(n-2)"]];
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this.codeID = Array(this.code.length);
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var i, j;
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for (i = 0; i < this.code.length; i++)
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{
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this.codeID[i] = new Array(this.code[i].length);
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for (j = 0; j < this.code[i].length; j++)
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{
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this.codeID[i][j] = this.nextIndex++;
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this.cmd("CreateLabel", this.codeID[i][j], this.code[i][j], DPFib.CODE_START_X, DPFib.CODE_START_Y + i * DPFib.CODE_LINE_HEIGHT, 0);
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this.cmd("SetForegroundColor", this.codeID[i][j], DPFib.CODE_STANDARD_COLOR);
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if (j > 0)
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{
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this.cmd("AlignRight", this.codeID[i][j], this.codeID[i][j-1]);
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}
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}
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}
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this.animationManager.StartNewAnimation(this.commands);
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this.animationManager.skipForward();
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this.animationManager.clearHistory();
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this.initialIndex = this.nextIndex;
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this.oldIDs = [];
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this.commands = [];
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}
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DPFib.prototype.addControls = function()
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{
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this.controls = [];
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this.fibField = addControlToAlgorithmBar("Text", "");
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this.fibField.onkeydown = this.returnSubmit(this.fibField, this.emptyCallback.bind(this), 2, true);
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this.controls.push(this.fibField);
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this.recursiveButton = addControlToAlgorithmBar("Button", "Fibonacci Recursive");
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this.recursiveButton.onclick = this.recursiveCallback.bind(this);
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this.controls.push(this.recursiveButton);
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this.tableButton = addControlToAlgorithmBar("Button", "Fibonacci Table");
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this.tableButton.onclick = this.tableCallback.bind(this);
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this.controls.push(this.tableButton);
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this.memoizedButton = addControlToAlgorithmBar("Button", "Fibonacci Memoized");
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this.memoizedButton.onclick = this.memoizedCallback.bind(this);
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this.controls.push(this.memoizedButton);
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}
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DPFib.prototype.buildTable = function(maxVal)
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{
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this.tableID = new Array(maxVal + 1);
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this.tableVals = new Array(maxVal + 1);
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this.tableXPos = new Array(maxVal + 1);
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this.tableYPos = new Array(maxVal + 1);
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var i;
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var indexID;
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var xPos;
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var yPos;
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var table_rows = Math.floor((this.canvasHeight - DPFib.TABLE_ELEM_HEIGHT - DPFib.TABLE_START_Y) / DPFib.TABLE_ELEM_HEIGHT);
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for (i = 0; i <= maxVal; i++)
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{
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this.tableID[i] = this.nextIndex++;
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this.tableVals[i] = -1;
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this.oldIDs.push(this.tableID[i]);
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yPos = i % table_rows * DPFib.TABLE_ELEM_HEIGHT + DPFib.TABLE_START_Y;
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xPos = Math.floor(i / table_rows) * DPFib.TABLE_DIFF_X + DPFib.TABLE_START_X;
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this.tableXPos[i] = xPos;
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this.tableYPos[i] = yPos;
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this.cmd("CreateRectangle", this.tableID[i],
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"",
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DPFib.TABLE_ELEM_WIDTH,
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DPFib.TABLE_ELEM_HEIGHT,
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xPos,
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yPos);
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indexID = this.nextIndex++;
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this.oldIDs.push(indexID);
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this.cmd("CreateLabel", indexID, i, xPos - DPFib.TABLE_ELEM_WIDTH, yPos);
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this.cmd("SetForegroundColor", indexID, DPFib.TABLE_INDEX_COLOR);
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}
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}
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DPFib.prototype.clearOldIDs = function()
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{
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for (var i = 0; i < this.oldIDs.length; i++)
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{
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this.cmd("Delete", this.oldIDs[i]);
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}
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this.oldIDs =[];
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this.nextIndex = this.initialIndex;
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}
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DPFib.prototype.reset = function()
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{
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this.oldIDs =[];
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this.nextIndex = this.initialIndex;
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}
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DPFib.prototype.emptyCallback = function(event)
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{
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this.implementAction(this.helpMessage.bind(this), "");
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// TODO: Put up a message to push the appropriate button?
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}
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DPFib.prototype.recursiveCallback = function(event)
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{
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var fibValue;
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if (this.fibField.value != "")
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{
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var fibValue = Math.min(parseInt(this.fibField.value), DPFib.MAX_VALUE);
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this.fibField.value = String(fibValue);
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this.implementAction(this.recursiveFib.bind(this),fibValue);
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}
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else
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{
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this.implementAction(this.helpMessage.bind(this), "");
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}
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}
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DPFib.prototype.tableCallback = function(event)
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{
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var fibValue;
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if (this.fibField.value != "")
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{
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var fibValue = Math.min(parseInt(this.fibField.value), DPFib.MAX_VALUE);
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this.fibField.value = String(fibValue);
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this.implementAction(this.tableFib.bind(this),fibValue);
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}
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else
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{
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this.implementAction(this.helpMessage.bind(this), "");
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}
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}
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DPFib.prototype.memoizedCallback = function(event)
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{
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var fibValue;
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if (this.fibField.value != "")
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{
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var fibValue = Math.min(parseInt(this.fibField.value), DPFib.MAX_VALUE);
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this.fibField.value = String(fibValue);
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this.implementAction(this.memoizedFib.bind(this),fibValue);
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}
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else
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{
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this.implementAction(this.helpMessage.bind(this), "");
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}
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}
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DPFib.prototype.helpMessage = function(value)
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{
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this.commands = [];
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this.clearOldIDs();
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var messageID = this.nextIndex++;
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this.oldIDs.push(messageID);
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this.cmd("CreateLabel", messageID,
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"Enter a value betweeen 0 and " + String(DPFib.MAX_VALUE) + " in the text field.\n" +
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"Then press the Fibonacci Recursive, Fibonacci Table, or Fibonacci Memoized button",
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DPFib.RECURSIVE_START_X, DPFib.RECURSIVE_START_Y, 0);
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return this.commands;
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}
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DPFib.prototype.recursiveFib = function(value)
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{
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this.commands = [];
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this.clearOldIDs();
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this.currentY = DPFib.RECURSIVE_START_Y;
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var functionCallID = this.nextIndex++;
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this.oldIDs.push(functionCallID);
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var final = this.fib(value, DPFib.RECURSIVE_START_X, functionCallID);
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this.cmd("SetText", functionCallID, "fib(" + String(value) + ") = " + String(final));
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return this.commands;
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}
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DPFib.prototype.fib = function(value, xPos, ID)
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{
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this.cmd("CreateLabel", ID, "fib(" + String(value)+")", xPos, this.currentY, 0);
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this.currentY += DPFib.RECURSIVE_DELTA_Y;
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this.cmd("SetForegroundColor", this.codeID[0][1], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[0][1], DPFib.CODE_STANDARD_COLOR);
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this.cmd("SetForegroundColor", this.codeID[1][1], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[1][1], DPFib.CODE_STANDARD_COLOR);
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if (value > 1)
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{
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var firstID = this.nextIndex++;
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var secondID = this.nextIndex++;
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this.cmd("SetForegroundColor", this.codeID[4][1], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[4][1], DPFib.CODE_STANDARD_COLOR);
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var firstValue = this.fib(value-1, xPos + DPFib.RECURSIVE_DELTA_X, firstID);
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this.currentY += DPFib.RECURSIVE_DELTA_Y;
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this.cmd("SetForegroundColor", this.codeID[4][3], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[4][3], DPFib.CODE_STANDARD_COLOR);
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var secondValue = this.fib(value-2, xPos + DPFib.RECURSIVE_DELTA_X, secondID);
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this.cmd("SetForegroundColor", this.codeID[4][1], DPFib.CODE_RECURSIVE_1_COLOR);
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this.cmd("SetForegroundColor", firstID, DPFib.CODE_RECURSIVE_1_COLOR);
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this.cmd("SetForegroundColor", this.codeID[4][2], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("SetForegroundColor", this.codeID[4][3], DPFib.CODE_RECURSIVE_2_COLOR);
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this.cmd("SetForegroundColor", secondID, DPFib.CODE_RECURSIVE_2_COLOR);
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[4][1], DPFib.CODE_STANDARD_COLOR);
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this.cmd("SetForegroundColor", this.codeID[4][2], DPFib.CODE_STANDARD_COLOR);
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this.cmd("SetForegroundColor", this.codeID[4][3], DPFib.CODE_STANDARD_COLOR);
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this.cmd("Delete", firstID);
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this.cmd("Delete", secondID);
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this.cmd("SetText", ID, firstValue + secondValue);
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this.cmd("Step");
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this.currentY = this.currentY - 2 * DPFib.RECURSIVE_DELTA_Y;
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return firstValue + secondValue;
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}
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else
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{
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this.cmd("SetText", ID, "1");
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this.cmd("SetForegroundColor", this.codeID[2][0], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[2][0], DPFib.CODE_STANDARD_COLOR);
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this.currentY -= DPFib.RECURSIVE_DELTA_Y;
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return 1;
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}
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}
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DPFib.prototype.tableFib = function(value)
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{
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this.commands = [];
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this.clearOldIDs();
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this.buildTable(value);
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var i;
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for (i = 0; i <= value && i <= 1; i++)
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{
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this.cmd("SetForegroundColor", this.codeID[1][1], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("SetForegroundColor", this.codeID[2][0], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("SetHighlight", this.tableID[i], 1);
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this.cmd("SetText", this.tableID[i], 1);
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this.tableVals[i] = 1;
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[1][1], DPFib.CODE_STANDARD_COLOR);
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this.cmd("SetForegroundColor", this.codeID[2][0], DPFib.CODE_STANDARD_COLOR);
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this.cmd("SetHighlight", this.tableID[i], 0);
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}
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for (i = 2; i <= value; i++)
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{
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this.cmd("SetHighlight", this.tableID[i-1], 1)
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this.cmd("SetHighlight", this.tableID[i-2], 1)
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this.cmd("SetForegroundColor", this.codeID[4][1], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("SetForegroundColor", this.codeID[4][2], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("SetForegroundColor", this.codeID[4][3], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("Step");
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this.tableVals[i] = this.tableVals[i-1] + this.tableVals[i-2];
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this.cmd("SetText", this.tableID[i], this.tableVals[i]);
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this.cmd("SetTextColor", this.tableID[i], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[4][1], DPFib.CODE_STANDARD_COLOR);
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this.cmd("SetForegroundColor", this.codeID[4][2], DPFib.CODE_STANDARD_COLOR);
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this.cmd("SetForegroundColor", this.codeID[4][3], DPFib.CODE_STANDARD_COLOR);
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this.cmd("SetTextColor", this.tableID[i], DPFib.CODE_STANDARD_COLOR);
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this.cmd("SetHighlight", this.tableID[i-1], 0)
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this.cmd("SetHighlight", this.tableID[i-2], 0)
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}
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var finalID = this.nextIndex++;
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this.oldIDs.push(finalID);
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this.cmd("CreateLabel", finalID, this.tableVals[value], this.tableXPos[value] - 5, this.tableYPos[value] - 5, 0);
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this.cmd("Move", finalID, DPFib.RECURSIVE_START_X, DPFib.RECURSIVE_START_Y);
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this.cmd("Step");
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this.cmd("SetText", finalID, "fib(" + String(value) + ") = " + String(this.tableVals[value]));
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return this.commands;
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}
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DPFib.prototype.fibMem = function(value, xPos, ID)
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{
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this.cmd("CreateLabel", ID, "fib(" + String(value)+")", xPos, this.currentY, 0);
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this.cmd("SetHighlight", this.tableID[value], 1);
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// TODO: Add an extra pause here?
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this.cmd("Step");
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if (this.tableVals[value] >= 0)
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{
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this.cmd("Delete", ID, "fib(" + String(value)+")", xPos, this.currentY, 0);
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this.cmd("CreateLabel", ID, this.tableVals[value], this.tableXPos[value] - 5, this.tableYPos[value] - 5, 0);
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this.cmd("Move", ID, xPos, this.currentY);
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this.cmd("Step")
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this.cmd("SetHighlight", this.tableID[value], 0);
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return this.tableVals[value];
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}
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this.cmd("SetHighlight", this.tableID[value], 0);
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this.currentY += DPFib.RECURSIVE_DELTA_Y;
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this.cmd("SetForegroundColor", this.codeID[0][1], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[0][1], DPFib.CODE_STANDARD_COLOR);
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this.cmd("SetForegroundColor", this.codeID[1][1], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[1][1], DPFib.CODE_STANDARD_COLOR);
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if (value > 1)
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{
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var firstID = this.nextIndex++;
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var secondID = this.nextIndex++;
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this.cmd("SetForegroundColor", this.codeID[4][1], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[4][1], DPFib.CODE_STANDARD_COLOR);
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var firstValue = this.fibMem(value-1, xPos + DPFib.RECURSIVE_DELTA_X, firstID);
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this.currentY += DPFib.RECURSIVE_DELTA_Y;
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this.cmd("SetForegroundColor", this.codeID[4][3], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[4][3], DPFib.CODE_STANDARD_COLOR);
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var secondValue = this.fibMem(value-2, xPos + DPFib.RECURSIVE_DELTA_X, secondID);
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this.cmd("SetForegroundColor", this.codeID[4][1], DPFib.CODE_RECURSIVE_1_COLOR);
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this.cmd("SetForegroundColor", firstID, DPFib.CODE_RECURSIVE_1_COLOR);
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this.cmd("SetForegroundColor", this.codeID[4][2], DPFib.CODE_HIGHLIGHT_COLOR);
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this.cmd("SetForegroundColor", this.codeID[4][3], DPFib.CODE_RECURSIVE_2_COLOR);
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this.cmd("SetForegroundColor", secondID, DPFib.CODE_RECURSIVE_2_COLOR);
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this.cmd("Step");
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this.cmd("SetForegroundColor", this.codeID[4][1], DPFib.CODE_STANDARD_COLOR);
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this.cmd("SetForegroundColor", this.codeID[4][2], DPFib.CODE_STANDARD_COLOR);
|
|
this.cmd("SetForegroundColor", this.codeID[4][3], DPFib.CODE_STANDARD_COLOR);
|
|
|
|
|
|
|
|
this.cmd("Delete", firstID);
|
|
this.cmd("Delete", secondID);
|
|
this.cmd("SetText", ID, firstValue + secondValue);
|
|
this.cmd("Step");
|
|
this.tableVals[value] = firstValue + secondValue;
|
|
this.currentY = this.currentY - 2 * DPFib.RECURSIVE_DELTA_Y;
|
|
this.cmd("CreateLabel", this.nextIndex, this.tableVals[value], xPos+5, this.currentY + 5);
|
|
this.cmd("Move", this.nextIndex, this.tableXPos[value], this.tableYPos[value], this.currentY);
|
|
this.cmd("Step");
|
|
this.cmd("Delete", this.nextIndex);
|
|
this.cmd("SetText", this.tableID[value], this.tableVals[value]);
|
|
return firstValue + secondValue;
|
|
}
|
|
else
|
|
{
|
|
this.cmd("SetText", ID, "1");
|
|
this.cmd("SetForegroundColor", this.codeID[2][0], DPFib.CODE_HIGHLIGHT_COLOR);
|
|
this.cmd("Step");
|
|
this.cmd("SetForegroundColor", this.codeID[2][0], DPFib.CODE_STANDARD_COLOR);
|
|
this.tableVals[value] = 1;
|
|
this.cmd("CreateLabel", this.nextIndex, this.tableVals[value], xPos + 5, this.currentY + 5);
|
|
this.cmd("Move", this.nextIndex, this.tableXPos[value], this.tableYPos[value], this.currentY);
|
|
this.cmd("Step");
|
|
this.cmd("Delete", this.nextIndex);
|
|
this.cmd("SetText", this.tableID[value], this.tableVals[value]);
|
|
|
|
this.currentY -= DPFib.RECURSIVE_DELTA_Y;
|
|
return 1;
|
|
}
|
|
|
|
}
|
|
|
|
DPFib.prototype.memoizedFib = function(value)
|
|
{
|
|
this.commands = [];
|
|
|
|
this.clearOldIDs();
|
|
this.buildTable(value);
|
|
|
|
this.currentY = DPFib.RECURSIVE_START_Y;
|
|
|
|
var functionCallID = this.nextIndex++;
|
|
this.oldIDs.push(functionCallID);
|
|
var final = this.fibMem(value, DPFib.RECURSIVE_START_X, functionCallID);
|
|
|
|
this.cmd("SetText", functionCallID, "fib(" + String(value) + ") = " + String(final));
|
|
return this.commands;
|
|
}
|
|
|
|
DPFib.prototype.enableUI = function(event)
|
|
{
|
|
for (var i = 0; i < this.controls.length; i++)
|
|
{
|
|
this.controls[i].disabled = false;
|
|
}
|
|
|
|
|
|
}
|
|
DPFib.prototype.disableUI = function(event)
|
|
{
|
|
for (var i = 0; i < this.controls.length; i++)
|
|
{
|
|
this.controls[i].disabled = true;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
var currentAlg;
|
|
|
|
function init()
|
|
{
|
|
var animManag = initCanvas();
|
|
currentAlg = new DPFib(animManag, canvas.width, canvas.height);
|
|
}
|
|
|
|
|
|
|