Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

handling touch input #7

Merged
merged 3 commits into from
Mar 11, 2017
Merged

handling touch input #7

Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
ee5bf42
handling touch input
bradgearon Mar 2, 2017
b4b54dc
removed index
bradgearon Mar 2, 2017
9cb1c30
added pinch zoom
bradgearon Mar 3, 2017
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
133 changes: 114 additions & 19 deletions dist/PhotoUploader.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3,6 +3,7 @@
var parameters = {};
var canvas = {};
var context = {};
var inputCache = [];

var camera = {
deviceIds: [],
Expand All @@ -29,20 +30,25 @@
offsetY: 0,
startX: 0,
startY: 0,
isDragging: 0
isDragging: false,
prevDiff: 0
};

$.fn.PhotoUploader = function (userParameters) {
parameters = $.extend({}, $.fn.PhotoUploader.defaultParameters, userParameters);
canvas = $("<canvas>", {
id: "canvas",
style: "border: 1px solid black"
style: "border: 1px solid black; touch-action: none"
})
.attr("width", parameters.photoWidth)
.attr("height", parameters.photoHeight)
.mousedown(handleMouseDown)
.mousemove(handleMouseMove)
.mouseup(handleMouseUp);
.on('mousedown', handleMouseDown)
.on('touchstart', handleMouseDown);

$(document).on('mousemove', handleMouseMove)
.on('touchmove', handleMouseMove)
.on('touchend', handleMouseUp)
.on('mouseup', handleMouseUp);

canvasOffset = canvas.offset();
mouseEvents.offsetX = canvasOffset.left;
Expand Down Expand Up @@ -364,13 +370,20 @@
}

function startVideo() {
$("#photoOr").show();
$("#photoCapture").show();
// Grab elements, create settings, etc.
this.video = document.getElementById('video');

if (parameters.fakeVideo) {
this.video.src = 'http://vjs.zencdn.net/v/oceans.mp4';
this.video.play();
return;
}

// Get access to the camera!
navigator.mediaDevices.getUserMedia(camera.constraints)
.then(function (userCameraStream) {
$("#photoOr").show();
$("#photoCapture").show();
// Grab elements, create settings, etc.
this.video = document.getElementById('video');
this.stream = userCameraStream;
this.video.src = window.URL.createObjectURL(userCameraStream);
this.video.play();
Expand Down Expand Up @@ -450,27 +463,107 @@
}
}

function getInput(e) {
if (e.type === 'touchstart' || e.type === 'touchmove') {
var touches = [];
if (!e.touches) {
touches = e.originalEvent.touches;

} else {
touches = e.touches;
}

inputCache = [];
for (var i = 0; i < touches.length; i++) {
inputCache.push({
clientX: touches[i].clientX,
clientY: touches[i].clientY,
identifier: touches[i].identifier
});
}

if(inputCache.length == 2) {
// Calculate the distance between the two pointers
var diffX = inputCache[0].clientX - inputCache[1].clientX;
var diffY = inputCache[0].clientY - inputCache[1].clientY;

// Pythagorean theorem
mouseEvents.distance = Math.sqrt(diffX * diffX + diffY * diffY);

if(mouseEvents.isDragging) {
mouseEvents.prevDistance = mouseEvents.distance;
}
}
} else {
if (e.type === 'mousedown') {
inputCache.push({
clientX: e.clientX,
clientY: e.clientY,
identifier: 0
});
} else if (mouseEvents.isDragging) {
inputCache[0].clientX = e.clientX;
inputCache[0].clientY = e.clientY;
inputCache[0].identifier = 0;
}
}

}

function removeInput(e) {
if (e.type === 'mouseup') {
inputCache = [];
}
// Remove this event from the target's cache
for (var i = 0; i < inputCache.length; i++) {
if (inputCache[i].pointerId == e.pointerId) {
inputCache.splice(i, 1);
break;
}
}
}

function handleMouseUp(e) {
mouseEvents.isDragging = 0;
removeInput(e);
mouseEvents.isDragging = inputCache.length === 1;
}

function handleMouseDown(e) {
mouseEvents.isDragging = 1;
mouseEvents.startX = parseInt(e.clientX - mouseEvents.offsetX);
mouseEvents.startY = parseInt(e.clientY - mouseEvents.offsetY);
getInput(e);
mouseEvents.isDragging = inputCache.length === 1;

if (mouseEvents.isDragging) {
mouseEvents.startX = parseInt(inputCache[0].clientX - mouseEvents.offsetX);
mouseEvents.startY = parseInt(inputCache[0].clientY - mouseEvents.offsetY);
}
}

function handleMouseMove(e) {
getInput(e);
if (mouseEvents.isDragging) {
dX = parseInt(e.clientX) - mouseEvents.startX - mouseEvents.offsetX;
dY = parseInt(e.clientY) - mouseEvents.startY - mouseEvents.offsetY;
dX = parseInt(inputCache[0].clientX) - mouseEvents.startX - mouseEvents.offsetX;
dY = parseInt(inputCache[0].clientY) - mouseEvents.startY - mouseEvents.offsetY;
currentImage.top += dY;
currentImage.bottom += dY;
currentImage.left += dX;
currentImage.right += dX;
mouseEvents.startX = parseInt(e.clientX);
mouseEvents.startY = parseInt(e.clientY);
mouseEvents.startX = parseInt(inputCache[0].clientX);
mouseEvents.startY = parseInt(inputCache[0].clientY);
updateCanvas();

} else if (inputCache.length == 2) {
var scale = mouseEvents.distance / mouseEvents.prevDistance;
if (scale > 0) {
// The distance between the two pointers has decreased
currentImage.width *= scale;
currentImage.height *= scale;

calcEdges();
updateCanvas();
}

// Cache the distance for the next move event
mouseEvents.prevDistance = mouseEvents.distance;
}
}

Expand All @@ -490,7 +583,8 @@

function updateCanvas() {
context.clearRect(0, 0, parameters.photoWidth, parameters.photoHeight);
context.drawImage(currentImage.image, currentImage.left, currentImage.top, currentImage.width, currentImage.height);
context.drawImage(currentImage.image, currentImage.left, currentImage.top,
currentImage.width, currentImage.height);
context.beginPath();
context.moveTo(currentImage.left, currentImage.top);
context.lineTo(currentImage.right, currentImage.top);
Expand All @@ -503,7 +597,8 @@


function canCapture() {
return navigator.mediaDevices && navigator.mediaDevices.getUserMedia && window.location.protocol == "https:"
return navigator.mediaDevices && navigator.mediaDevices.getUserMedia &&
window.location.protocol == "https:"
}

$.fn.PhotoUploader.defaultParameters = {
Expand Down