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added a crosshair for easier tagging #9

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added a crosshair for easier tagging #9

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33 changes: 31 additions & 2 deletions templates/tagger.html
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Original file line number Diff line number Diff line change
Expand Up @@ -66,15 +66,21 @@ <h3 class="panel-title">Labels</h3>
{% endif %}
</div>
<div style="overflow: scroll">
<canvas id="canvas" style="width:100%; height:80%; margin: 0; padding: 0;"></canvas>
<div style="position: relative" id="holder">
<canvas id="overlay" style="position: absolute; left: 0; top: 0; z-index: 1; width:100%; height:80%; margin: 0; padding: 0;"></canvas>
<canvas id="canvas" style="position: absolute; left: 0; top: 0; z-index: 0; width:100%; height:80%; margin: 0; padding: 0;"></canvas>
</div>
</div>
<!-- <a href="/next" class="btn btn-primary" style="float:left;" type="button">
<span class="glyphicon glyphicon-arrow-left"></span>
</a> -->
<script>
var labels = {{ labels|tojson|safe }};
var c = document.getElementById("canvas");
var overlay = document.getElementById("overlay");
var holder = document.getElementById("holder");
var ctx = c.getContext("2d");
var overlayCtx = overlay.getContext("2d");
var drawLabels = function(id, xMin, xMax, yMin, yMax) {
ctx.strokeStyle = "pink";
ctx.fillStyle = "pink";
Expand All @@ -87,10 +93,16 @@ <h3 class="panel-title">Labels</h3>
var image = new Image();
console.log(image);
image.onload = function(e) {
holder.style.height = image.height + "px";
holder.style.width = image.width + "px";
ctx.canvas.width = image.width;
ctx.canvas.height = image.height;
c.width = image.width;
c.height = image.height;
overlayCtx.canvas.width = image.width;
overlayCtx.canvas.height = image.height;
overlay.width = image.width;
overlay.height = image.height;
ctx.drawImage(image, 0, 0);
console.log(labels);
for (i = 0; i < labels.length; i++){
Expand All @@ -102,7 +114,24 @@ <h3 class="panel-title">Labels</h3>

var clicked = false;
var fPoint = {};
c.onclick = function(e) {

overlay.onmousemove = function(e) {
const w = overlay.width;
const h = overlay.height;
const x = (image.width / overlay.scrollWidth) * e.offsetX;
const y = (image.height / overlay.scrollHeight) * e.offsetY;
overlayCtx.clearRect(0, 0, w, h);
overlayCtx.beginPath();
overlayCtx.strokeStyle = "blue";
overlayCtx.moveTo(0,y);
overlayCtx.lineTo(w,y);
overlayCtx.stroke();
overlayCtx.moveTo(x,0);
overlayCtx.lineTo(x,h);
overlayCtx.stroke();
}

overlay.onclick = function(e) {
console.log(clicked);
if (!clicked) {
var x = (image.width / c.scrollWidth) * e.offsetX;
Expand Down