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Code Issues Projects Releases Wiki Activity

1540 Add point support on the demo page

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This commit is contained in:
Yansong Hong 2020-02-07 16:04:16 -08:00
parent 7193f5b445
commit 956c830f3e
1 changed files with 78 additions and 27 deletions
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101
test/demo/cropping-polygons.html
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@ -13,7 +13,7 @@
}
textarea {
width: 200px;
width: 215px;
height: 200px;
}
@ -22,8 +22,8 @@
display: inline-block;
text-align: center;
}
.box-with-title button{
display: block;
.buttons {
width: 215px;
}
*:focus {
@ -43,11 +43,24 @@
<button id='exampleBtn'>Load Example</button>
</div>
<div class='box-with-title'>
<button id="addBtn">Add As Polygon</button>
<textarea id="polygonEl"></textarea>
<div class="buttons">
<button id="addArrayBtn">Add Array as Polygon</button>
<button onclick="emptyElement('polygonArrayEl')">Clear</button>
</div>
<textarea id="polygonArrayEl"></textarea>
</div>
<div class='box-with-title'>
<div class="buttons">
<button id="addPointBtn">Add Points as Polygon</button>
<button onclick="emptyElement('polygonPointEl')">Clear</button>
</div>
<textarea id="polygonPointEl"></textarea>
</div>
<div class='box-with-title'>
<div class="buttons">
<button id="cropBtn">Crop With Polygon</button>
<button onclick="emptyElement('previewEl')">Clear</button>
</div>
<textarea id='previewEl'></textarea>
</div>
@ -68,54 +81,92 @@
<script>
// Global Variables
var previewEl = document.getElementById('previewEl');
var polygonEl = document.getElementById('polygonEl');
var polygonArrayEl = document.getElementById('polygonArrayEl');
var polygonPointEl = document.getElementById('polygonPointEl');
var examples = [
[[480,300],[300,420],[600,420]], // Triangle
[[300,550],[300,750],[600,750],[600,550]] // Rectangle
];
var polygon = [];
var polygonList = [];
// Load default examples
function loadExample(){
polygonList = JSON.parse(JSON.stringify(examples));
previewEl.value = JSON.stringify(polygonList);
previewEl.value = JSON.stringify(examples);
}
loadExample();
// Set a given element's value to empty string
function emptyElement(elementId) {
document.getElementById(elementId).value = '';
}
// JSON parse a given object, then insert object assuming parsed value is array.
function insertObjectToElement(object, element) {
var parsed = []; // Default to empty array
try {
parsed = JSON.parse(element.value);
} catch(error) { }
parsed.push(object);
element.value = JSON.stringify(parsed)
}
// Add click handler to clicked point tracker
viewer.addHandler('canvas-click', function(event) {
var webPoint = event.position;
var viewportPoint = viewer.viewport.pointFromPixel(webPoint);
var viewportPoint = viewer.viewport.pointFromPixel(event.position);
var p = viewer.viewport.viewportToImageCoordinates(viewportPoint);
p.x = Math.round((p.x + Number.EPSILON) * 100) / 100
p.y = Math.round((p.y + Number.EPSILON) * 100) / 100
polygon.push([p.x, p.y]);
polygonEl.value += '['+p.x+','+ p.y+']';
insertObjectToElement([p.x, p.y], polygonArrayEl);
insertObjectToElement({x:p.x, y:p.y}, polygonPointEl);
});
// Add clicked points to polygon tracker variable
document.getElementById('addBtn').onclick = function(){
if (polygon.length == 0) { return; }
// Evaluate give element in JavaScript variable, default to empty array.
function readElementValueDefaultToEmptyArray(elementId) {
try {
var val = document.getElementById(elementId).value;
if (val === '') { return []; }
return eval(val); // If using JSON.parse, user must put quotes [{"x": 123, "y":12}]
} catch (e) {
return [];
}
}
// Insert value from given element into preview element
function insertValueFromElementToPreviewElement(element) {
try {
if (element.value === '') { return; }
var polygon = eval(element.value);
var polygonList = readElementValueDefaultToEmptyArray('previewEl');
polygonList.push(polygon);
polygon = [];
polygonEl.value = '';
element.value = '';
previewEl.value = JSON.stringify(polygonList);
} catch(error) {
console.log(error);
}
}
// Add clicked points to polygon tracker variable
document.getElementById('addArrayBtn').onclick = function(){
insertValueFromElementToPreviewElement(polygonArrayEl);
};
// Add clicked points to polygon tracker variable as point objects
document.getElementById('addPointBtn').onclick = function(){
insertValueFromElementToPreviewElement(polygonPointEl);
};
// Crop image with value in the preview element
document.getElementById('cropBtn').onclick = function(){
polygonList = JSON.parse(previewEl.value);
polygonEl.value = '';
var polygonList = eval(previewEl.value);
var tiledImage = viewer.world.getItemAt(0);
tiledImage.setCroppingPolygons(polygonList);
viewer.forceRedraw();
emptyElement('previewEl');
};
document.getElementById('resetBtn').onclick = function(){
polygonList = []
polygon = []
polygonEl.value = '';
previewEl.value = '';
emptyElement('polygonArrayEl');
emptyElement('polygonPointEl');
emptyElement('previewEl');
var tiledImage = viewer.world.getItemAt(0);
tiledImage.resetCroppingPolygons();
viewer.forceRedraw();