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display.js
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display.js
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var boxes = [],
dataStructures = {
init: function(ds) {
if (typeof currentAlgorithmFile != "undefined")
prettyPrint(); // Prettify
if (ds instanceof Stack)
createStackOperations(ds);
else if (ds instanceof Queue)
createQueueOperations(ds);
else if (ds instanceof LinkedList)
createLinkedListOperations(ds);
setInterval(utils.createDrawFunction($("#canvas")[0], draw), 10);
}
};
function draw(context, width, height) {
context.clearRect(0, 0, width, height);
context.fillStyle = "rgb(0, 0, 0)";
context.font = "12px sans";
context.textBaseline = "top";
$.each(boxes, function(_, box) {
var padding = 5,
textPadding = 5;
context.strokeRect(box.pos + padding, padding, box.width,
box.height);
context.fillText(box.content, box.pos + padding + textPadding,
padding + textPadding);
});
}
function moveBoxes(distance, startIndex, callback) {
var boxesToMove = boxes.slice(startIndex),
boxMover;
$.each(boxesToMove, function(_, box) {
box.goal = box.pos + distance;
});
boxMover = setInterval(function() {
var finished = true;
$.each(boxesToMove, function(_, box) {
if (typeof box.goal == "undefined")
return;
finished = false;
if (box.pos < box.goal)
box.pos++;
else if (box.pos > box.goal)
box.pos--;
else {
delete box.goal;
finished = true;
}
});
if (finished) {
clearInterval(boxMover);
callback();
}
}, 5);
}
function addBox(index, value, callback) {
var boxSize = 20,
boxContent = new String(value),
boxWidth = boxContent.length * boxSize;
function insertFunction() {
var pos;
if (index == 0)
pos = 0;
else
pos = boxes[index - 1].pos + boxes[index - 1].width;
boxes.splice(index, 0, {
pos: pos,
width: boxWidth,
height: boxSize,
content: boxContent
});
callback();
}
if (index == 0)
moveBoxes(boxWidth, 0, insertFunction);
else
insertFunction();
}
function removeBox(index, callback) {
var removedBox;
if (boxes.length == 0) {
callback();
return;
}
removedBox = boxes.splice(index, 1)[0];
if (index < boxes.length)
moveBoxes(-1 * removedBox.width, index, callback);
else
callback();
}
function operations() {
return $("div.operation input");
}
function disableOperations() {
operations().attr("disabled", "true");
}
function enableOperations() {
operations().removeAttr("disabled");
}
function createStackOperations(stack) {
var pushInput = $("<input/>").attr("type", "text")
.attr("id", "pushInput").attr("size", "3"),
pushButton = $("<input/>").attr("type", "button")
.attr("id", "pushButton").attr("value", "Push"),
popButton = $("<input/>").attr("type", "button")
.attr("id", "popButton").attr("value", "Pop"),
popOutput = $("<label/>").attr("id", "popOutput"),
pushOperation = $("<div/>").attr("class", "operation")
.append(pushInput).append(pushButton),
popOperation = $("<div/>").attr("class", "operation")
.append(popButton).append(popOutput);
$("#operations").append(pushOperation).append(popOperation);
pushButton.click(function() {
var value = pushInput.val();
if (!value)
return;
stack.push(value);
disableOperations();
addBox(0, value, enableOperations);
});
popButton.click(function() {
popOutput.text(stack.pop() || "");
disableOperations();
removeBox(0, enableOperations);
});
}
function createQueueOperations(queue) {
var enqueueInput = $("<input/>").attr("type", "text")
.attr("id", "enqueueInput").attr("size", "3"),
enqueueButton = $("<input/>").attr("type", "button")
.attr("id", "enqueueButton").attr("value", "Enqueue"),
dequeueButton = $("<input/>").attr("type", "button")
.attr("id", "dequeueButton").attr("value", "Dequeue"),
dequeueOutput = $("<label/>").attr("id", "dequeueOutput"),
enqueueOperation = $("<div/>").attr("class", "operation")
.append(enqueueInput).append(enqueueButton),
dequeueOperation = $("<div/>").attr("class", "operation")
.append(dequeueButton).append(dequeueOutput);
$("#operations").append(enqueueOperation).append(dequeueOperation);
enqueueButton.click(function() {
var value = enqueueInput.val();
if (!value)
return;
queue.enqueue(value);
disableOperations();
addBox(0, value, enableOperations);
});
dequeueButton.click(function() {
dequeueOutput.text(queue.dequeue() || "");
disableOperations();
removeBox(boxes.length - 1, enableOperations);
});
}
function createLinkedListOperations(linkedList) {
var insertInput = $("<input/>").attr("type", "text")
.attr("id", "insertInput").attr("size", "3"),
insertButton = $("<input/>").attr("type", "button")
.attr("id", "insertButton").attr("value", "Insert"),
deleteButton = $("<input/>").attr("type", "button")
.attr("id", "deleteButton").attr("value", "Delete"),
deleteInput = $("<input/>").attr("type", "text")
.attr("id", "deleteInput").attr("size", "3"),
insertOperation = $("<div/>").attr("class", "operation")
.append(insertInput).append(insertButton),
deleteOperation = $("<div/>").attr("class", "operation")
.append(deleteInput).append(deleteButton);
$("#operations").append(insertOperation).append(deleteOperation);
insertButton.click(function() {
var value = insertInput.val();
if (!value)
return;
linkedList.insert({key: value});
disableOperations();
addBox(boxes.length, value, enableOperations);
});
deleteButton.click(function() {
var value = deleteInput.val(),
index;
if (!value || !linkedList.search(value))
return;
index = linkedList.toArray().indexOf(value);
linkedList.delete(linkedList.search(value));
disableOperations();
removeBox(index, enableOperations);
});
}