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sketchpadTemplate.html
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<html>
<head>
<title>Sketchpad</title>
<link rel="stylesheet" href="style.css">
<script type="text/javascript" src="sketchpad.js"></script>
<script type="text/javascript" src="istraw.js"></script>
<script type="text/javascript" src="shortStraw.js"></script>
<script type="text/javascript" src="sketchRecTools.js"></script>
</head>
<body onload="init()">
<div id="content">
<div>
<canvas id="drawCanvas" class="canvaslook" width="400" height="400" ></canvas>
<!-- <canvas id="sketchpad" width="400" height="400" ></canvas> -->
</div>
<div>
<canvas id="previewCanvas" class="canvaslook" width="400" height="400"></canvas>
</div>
<div>
<input type="submit" value="Clear" class="elementlook" onclick="clearButton(drawCanvas, drawContext);">
<input type="submit" value="Undo" class="elementlook" onclick="undoButton(drawCanvas, drawContext);">
<input type="submit" value="Test" class="elementlook" onclick="testButton();">
<select id="algorithm" class="elementlook" onChange="instruct()">
<option value="-----" >--------------------</option>
<option value="boundingBox" >Bounding Box</option>
<option value="boundingBoxes" >Bounding Boxes</option>
<option value="centerCentroid" >Center (Centroid)</option>
<option value="centerMidpoint" >Center (Midpoint)</option>
<option value="shortStraw" >Corner-Finding (ShortStraw)</option>
<option value="iStraw" >Corner-Finding (IStraw)</option>
<option value="endpoints" >Endpoints</option>
<option value="resampleByCount" >Resample (Count)</option>
<option value="resampleByDistance">Resample (Distance)</option>
<option value="scaleProportion" >Scale (Proportional)</option>
<option value="scaleSquare" >Scale (Square)</option>
<option value="translate" >Translate</option>
</select>
<input type="text" id="argument" class="elementlook" name="argument" maxlength="6" size="6">
</div>
<div>
<!-- put output here -->
</div>
<div>
<p id="instructions"></p>
</div>
</div>
<script>
function testButton() {
showPreview();
var sketch = getSketch();
// --------------------------------------------------
var algorithmElement = document.getElementById("algorithm");
var argumentElement = document.getElementById("argument");
var algorithmName = algorithmElement.options[algorithmElement.selectedIndex].text;
var argumentValue = argumentElement.value;
if (argumentValue !== "") { argumentValue = Number.parseInt(argumentValue); } // parse arrgument from string to number
if (algorithmName === "Bounding Box") { displayBoundingBox(sketch); }
if (algorithmName === "Bounding Boxes") { displayBoundingBoxes(sketch); }
if (algorithmName === "Corner-Finding (IStraw)") { displayCornerFindingIStraw(sketch); }
if (algorithmName === "Corner-Finding (ShortStraw)") { displayCornerFindingShortStraw(sketch); }
if (algorithmName === "Center (Centroid)") { displayCenterCentroid(sketch); }
if (algorithmName === "Center (Midpoint)") { displayCenterMidpoint(sketch); }
if (algorithmName === "Endpoints") { displayEndpoints(sketch); }
if (algorithmName === "Resample (Count)") { displayResampleByCount(sketch, argumentValue); }
if (algorithmName === "Resample (Distance)") { displayResampleByDistance(sketch, argumentValue); }
if (algorithmName === "Scale (Proportional)") { displayScaleProportional(sketch, argumentValue); }
if (algorithmName === "Scale (Square)") { displayScaleSquare(sketch, argumentValue); }
if (algorithmName === "Translate") { displayTranslate(sketch, argumentValue); }
}
function displayBoundingBox(sketch) {
var box = SketchRecTools.calculateBoundingBox(sketch);
// get the strokes
var topStroke = {points: [box.topLeft, box.topRight]};
var leftStroke = {points: [box.topLeft, box.bottomLeft]};
var rightStroke = {points: [box.topRight, box.bottomRight]};
var bottomStroke = {points: [box.bottomLeft, box.bottomRight]};
var boundingStrokes = [topStroke, leftStroke, rightStroke, bottomStroke];
var boundingBox = { strokes: boundingStrokes };
previewSketch(sketch, "gray");
previewSketch(boundingBox, "red");
}
function displayBoundingBoxes(sketch) {
var boundingStrokes = [];
// iterate through each sketch stroke
var strokes = sketch.strokes;
strokes.forEach(function(stroke){
// wrap the stroke into a sketch
var strokeSketch = { strokes: [stroke] };
var box = SketchRecTools.calculateBoundingBox(strokeSketch);
// get the strokes
var topStroke = {points: [box.topLeft, box.topRight]};
var leftStroke = {points: [box.topLeft, box.bottomLeft]};
var rightStroke = {points: [box.topRight, box.bottomRight]};
var bottomStroke = {points: [box.bottomLeft, box.bottomRight]};
boundingStrokes.push(topStroke, leftStroke, rightStroke, bottomStroke);
});
var boundingBox = { strokes: boundingStrokes };
previewSketch(sketch, "gray");
previewSketch(boundingBox, "red");
}
function displayEndpoints(sketch) {
var endpoints = [];
var strokes = sketch.strokes;
for (var i = 0; i < strokes.length; i++) {
var points = strokes[i].points;
var start = points[0];
var end = points[points.length-1];
endpoints.push(start);
endpoints.push(end);
}
previewSketch(sketch, "gray");
previewPoints(endpoints, "red");
}
function displayCornerFindingShortStraw(sketch) {
var corners = ShortStraw.findShortStrawCorners(sketch);
previewSketch(sketch, "gray");
previewPoints(corners, "red");
}
function displayCornerFindingShortStraw(sketch) {
// get the resampled sketch and its corner indices
var resampledSketch = SketchRecTools.resampleByDistance(sketch);
var sketchCornerIndices = ShortStraw.run(resampledSketch);
// gather the corners from their indices
var corners = [];
for (var i = 0; i < resampledSketch.strokes.length; i++) {
var resampledPoints = resampledSketch.strokes[i].points;
var strokeCornerIndices = sketchCornerIndices[i];
for (var j = 0; j < strokeCornerIndices.length; j++) {
corners.push(resampledPoints[strokeCornerIndices[j]]);
}
}
previewSketch(sketch, "gray");
previewPoints(corners, "red");
}
function displayCornerFindingIStraw(sketch) {
// get the resampled sketch and its corner indices
var resampledSketch = SketchRecTools.resampleByDistance(sketch);
var sketchCornerIndices = IStraw.run(resampledSketch);
// gather the corners from their indices
var corners = [];
for (var i = 0; i < resampledSketch.strokes.length; i++) {
var resampledPoints = resampledSketch.strokes[i].points;
var strokeCornerIndices = sketchCornerIndices[i];
for (var j = 0; j < strokeCornerIndices.length; j++) {
corners.push(resampledPoints[strokeCornerIndices[j]]);
}
}
previewSketch(sketch, "gray");
previewPoints(corners, "red");
}
function displayEndpoints(sketch) {
var endpoints = [];
var strokes = sketch.strokes;
for (var i = 0; i < strokes.length; i++) {
var points = strokes[i].points;
var start = points[0];
var end = points[points.length-1];
endpoints.push(start);
endpoints.push(end);
}
previewSketch(sketch, "gray");
previewPoints(endpoints, "red");
}
function displayResampleByCount(sketch, value) {
if (isNaN(parseInt(value))) { return; }
if (value < 1 || value > 200) { return; };
var resampledSketch = SketchRecTools.resampleByCount(sketch, value);
var resampledPoints = [];
var resampledStrokes = resampledSketch.strokes;
for (var i = 0; i < resampledStrokes.length; i++) {
var resampledStroke = resampledStrokes[i];
for (var j = 0; j < resampledStroke.points.length; j++) {
resampledPoints.push(resampledStroke.points[j]);
}
}
previewSketch(sketch, "gray");
previewSketch(resampledSketch, "black");
previewPoints(resampledPoints, "red");
}
function displayResampleByDistance(sketch, value) {
// handle out-of-range input values
if (isNaN(parseInt(value))) { return; }
else if (value < 1 || value > 500) { return };
var resampledSketch = SketchRecTools.resampleByDistance(sketch, value);
var resampledPoints = [];
var resampledStrokes = resampledSketch.strokes;
for (var i = 0; i < resampledStrokes.length; i++) {
var resampledStroke = resampledStrokes[i];
for (var j = 0; j < resampledStroke.points.length; j++) {
resampledPoints.push(resampledStroke.points[j]);
}
}
previewSketch(sketch, "gray");
previewSketch(resampledSketch, "black");
previewPoints(resampledPoints, "red");
}
function displayTranslate(sketch, value) {
// handle out-of-range input values
if (isNaN(parseInt(value))) { return; }
else if (value < 1 || value > 200) { return };
// get the bounding box's center
var box = SketchRecTools.calculateBoundingBox(sketch);
if (box === null) { return; }
// get the canvas dimensions
var canvas = document.getElementById("drawCanvas");
var width = canvas.width;
var height = canvas.height;
// get edge distance
var leftDistance = box.centerX - 0;
var rightDistance = width - box.centerX;
var topDistance = box.centerY - 0;
var bottomDistance = height - box.centerY;
// get move travel
var moveX = leftDistance < rightDistance ? value : -value;
var moveY = topDistance < bottomDistance ? value : -value;
// get the translated sketch
var newSketch = SketchRecTools.translate(sketch, moveX, moveY);
previewSketch(newSketch, "black");
}
function displayCenterMidpoint(sketch) {
var canvas = document.getElementById("drawCanvas");
var x = canvas.width / 2;
var y = canvas.height / 2;
var center = {x: x, y: y};
var newSketch = SketchRecTools.translateToMidpoint(sketch, center);
previewSketch(sketch, "LightGray");
previewSketch(newSketch, "black");
}
function displayCenterCentroid(sketch) {
var canvas = document.getElementById("drawCanvas");
var x = canvas.width / 2;
var y = canvas.height / 2;
var center = {x: x, y: y};
var newSketch = SketchRecTools.translateToCentroid(sketch, center);
previewSketch(sketch, "LightGray");
previewSketch(newSketch, "black");
}
function displayScaleProportional(sketch, value) {
if (isNaN(parseInt(value))) { return; }
if (value < 50 || value > 300) { return; };
var newSketch = SketchRecTools.scaleProportional(sketch, value);
previewSketch(sketch, "LightGray");
previewSketch(newSketch, "black");
}
function displayScaleSquare(sketch, value) {
if (isNaN(parseInt(value))) { return; }
if (value < 50 || value > 300) { return; };
var newSketch = SketchRecTools.scaleSquare(sketch, value);
previewSketch(sketch, "LightGray");
previewSketch(newSketch, "black");
}
// ----- helper methods -----
function instruct() {
//
var hasSelected = false;
// get the name of the dropdown menu's current selection
var algorithmElement = document.getElementById("algorithm");
var instructionsElement = document.getElementById("instructions");
var argumentElement = document.getElementById("argument");
var algorithmName = algorithmElement.options[algorithmElement.selectedIndex].text;
// display the corresponding instructions
if (algorithmName === "Corner-Finding (ShortStraw)") {
instructionsElement.innerHTML = "this corner-finder only works on polylines";
hasSelected = true;
}
if (algorithmName === "Resample (Count)") {
argumentElement.value = 32;
instructionsElement.innerHTML = "Enter value between 1 and 200";
hasSelected = true;
}
if (algorithmName === "Resample (Distance)") {
argumentElement.value = 50;
instructionsElement.innerHTML = "Enter value between 1 and 500";
hasSelected = true;
}
if (algorithmName === "Translate") {
argumentElement.value = 50;
instructionsElement.innerHTML = "Enter value between 1 and 200";
hasSelected = true;
}
if (algorithmName === "Scale (Proportional)") {
argumentElement.value = 100;
instructionsElement.innerHTML = "Enter value between 50 and 300";
hasSelected = true;
}
if (algorithmName === "Scale (Square)") {
argumentElement.value = 100;
instructionsElement.innerHTML = "Enter value between 50 and 300";
hasSelected = true;
}
//
if (!hasSelected) {
argumentElement.value = "";
instructionsElement.innerHTML = "";
}
}
</script>
</body>
</html>