How to drag an Openseadrago canvas with mouse middle wheel button
1
I am using Openseadragon library with fabricjs overlay. I have a case where I want to drag the canvas but instead of mouse primary button, I want to drag it with middle mouse button press. Could anyone please help me get the desired behavior?
javascript javascript-events mouse fabricjs openseadragon
edited Nov 26 '18 at 11:46
Vadim Kotov
4,63663447
asked Nov 20 '18 at 6:19
FatehFateh
103
add a comment |
1
I am using Openseadragon library with fabricjs overlay. I have a case where I want to drag the canvas but instead of mouse primary button, I want to drag it with middle mouse button press. Could anyone please help me get the desired behavior?
javascript javascript-events mouse fabricjs openseadragon
edited Nov 26 '18 at 11:46
Vadim Kotov
4,63663447
asked Nov 20 '18 at 6:19
FatehFateh
103
add a comment |
1
1
1
I am using Openseadragon library with fabricjs overlay. I have a case where I want to drag the canvas but instead of mouse primary button, I want to drag it with middle mouse button press. Could anyone please help me get the desired behavior?
javascript javascript-events mouse fabricjs openseadragon
edited Nov 26 '18 at 11:46
Vadim Kotov
4,63663447
asked Nov 20 '18 at 6:19
FatehFateh
103
I am using Openseadragon library with fabricjs overlay. I have a case where I want to drag the canvas but instead of mouse primary button, I want to drag it with middle mouse button press. Could anyone please help me get the desired behavior?
javascript javascript-events mouse fabricjs openseadragon
javascript javascript-events mouse fabricjs openseadragon
edited Nov 26 '18 at 11:46
Vadim Kotov
4,63663447
asked Nov 20 '18 at 6:19
FatehFateh
103
edited Nov 26 '18 at 11:46
Vadim Kotov
4,63663447
asked Nov 20 '18 at 6:19
FatehFateh
103
edited Nov 26 '18 at 11:46
Vadim Kotov
4,63663447
edited Nov 26 '18 at 11:46
Vadim Kotov
4,63663447
edited Nov 26 '18 at 11:46
Vadim Kotov
4,63663447
4,63663447
asked Nov 20 '18 at 6:19
FatehFateh
103
asked Nov 20 '18 at 6:19
FatehFateh
103
asked Nov 20 '18 at 6:19
FatehFateh
103
103
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
1
OpenSeadragon doesn't have a flag for that, but you can easily build it using the MouseTracker. Here's an example (coded from memory and not tested, but it should give you the idea).
var drag;
var mouseTracker = new OpenSeadragon.MouseTracker({
element: viewer.container,
nonPrimaryPressHandler: function(event) {
if (event.button === 1) { // Middle
drag = {
lastPos: event.position.clone()
};
}
},
moveHandler: function(event) {
if (drag) {
var deltaPixels = drag.lastPos.minus(event.position);
var deltaPoints = viewer.viewport.deltaPointsFromPixels(deltaPixels);
viewer.viewport.panBy(deltaPoints);
drag.lastPos = event.position.clone();
}
},
nonPrimaryReleaseHandler: function(event) {
if (event.button === 1) {
drag = null;
}
}
});
EDIT: I had a bug in the example code above; fixed.
answered Nov 28 '18 at 18:23
iangilmaniangilman
1,3091810
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 '18 at 12:58
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 '18 at 15:03
I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had theminusbackward so it was going in the wrong direction. Let me know if this works now!
– iangilman
Dec 11 '18 at 0:57
yes, now it's perfect.
– Fateh
Dec 13 '18 at 12:02
Excellent; glad to hear it! :)
– iangilman
Dec 13 '18 at 17:35
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
OpenSeadragon doesn't have a flag for that, but you can easily build it using the MouseTracker. Here's an example (coded from memory and not tested, but it should give you the idea).
var drag;
var mouseTracker = new OpenSeadragon.MouseTracker({
element: viewer.container,
nonPrimaryPressHandler: function(event) {
if (event.button === 1) { // Middle
drag = {
lastPos: event.position.clone()
};
}
},
moveHandler: function(event) {
if (drag) {
var deltaPixels = drag.lastPos.minus(event.position);
var deltaPoints = viewer.viewport.deltaPointsFromPixels(deltaPixels);
viewer.viewport.panBy(deltaPoints);
drag.lastPos = event.position.clone();
}
},
nonPrimaryReleaseHandler: function(event) {
if (event.button === 1) {
drag = null;
}
}
});
EDIT: I had a bug in the example code above; fixed.
answered Nov 28 '18 at 18:23
iangilmaniangilman
1,3091810
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 '18 at 12:58
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 '18 at 15:03
I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had theminusbackward so it was going in the wrong direction. Let me know if this works now!
– iangilman
Dec 11 '18 at 0:57
yes, now it's perfect.
– Fateh
Dec 13 '18 at 12:02
Excellent; glad to hear it! :)
– iangilman
Dec 13 '18 at 17:35
add a comment |
1
OpenSeadragon doesn't have a flag for that, but you can easily build it using the MouseTracker. Here's an example (coded from memory and not tested, but it should give you the idea).
var drag;
var mouseTracker = new OpenSeadragon.MouseTracker({
element: viewer.container,
nonPrimaryPressHandler: function(event) {
if (event.button === 1) { // Middle
drag = {
lastPos: event.position.clone()
};
}
},
moveHandler: function(event) {
if (drag) {
var deltaPixels = drag.lastPos.minus(event.position);
var deltaPoints = viewer.viewport.deltaPointsFromPixels(deltaPixels);
viewer.viewport.panBy(deltaPoints);
drag.lastPos = event.position.clone();
}
},
nonPrimaryReleaseHandler: function(event) {
if (event.button === 1) {
drag = null;
}
}
});
EDIT: I had a bug in the example code above; fixed.
answered Nov 28 '18 at 18:23
iangilmaniangilman
1,3091810
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 '18 at 12:58
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 '18 at 15:03
I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had theminusbackward so it was going in the wrong direction. Let me know if this works now!
– iangilman
Dec 11 '18 at 0:57
yes, now it's perfect.
– Fateh
Dec 13 '18 at 12:02
Excellent; glad to hear it! :)
– iangilman
Dec 13 '18 at 17:35
add a comment |
1
1
1
OpenSeadragon doesn't have a flag for that, but you can easily build it using the MouseTracker. Here's an example (coded from memory and not tested, but it should give you the idea).
var drag;
var mouseTracker = new OpenSeadragon.MouseTracker({
element: viewer.container,
nonPrimaryPressHandler: function(event) {
if (event.button === 1) { // Middle
drag = {
lastPos: event.position.clone()
};
}
},
moveHandler: function(event) {
if (drag) {
var deltaPixels = drag.lastPos.minus(event.position);
var deltaPoints = viewer.viewport.deltaPointsFromPixels(deltaPixels);
viewer.viewport.panBy(deltaPoints);
drag.lastPos = event.position.clone();
}
},
nonPrimaryReleaseHandler: function(event) {
if (event.button === 1) {
drag = null;
}
}
});
EDIT: I had a bug in the example code above; fixed.
answered Nov 28 '18 at 18:23
iangilmaniangilman
1,3091810
OpenSeadragon doesn't have a flag for that, but you can easily build it using the MouseTracker. Here's an example (coded from memory and not tested, but it should give you the idea).
var drag;
var mouseTracker = new OpenSeadragon.MouseTracker({
element: viewer.container,
nonPrimaryPressHandler: function(event) {
if (event.button === 1) { // Middle
drag = {
lastPos: event.position.clone()
};
}
},
moveHandler: function(event) {
if (drag) {
var deltaPixels = drag.lastPos.minus(event.position);
var deltaPoints = viewer.viewport.deltaPointsFromPixels(deltaPixels);
viewer.viewport.panBy(deltaPoints);
drag.lastPos = event.position.clone();
}
},
nonPrimaryReleaseHandler: function(event) {
if (event.button === 1) {
drag = null;
}
}
});
EDIT: I had a bug in the example code above; fixed.
answered Nov 28 '18 at 18:23
iangilmaniangilman
1,3091810
edited Dec 11 '18 at 0:54
answered Nov 28 '18 at 18:23
iangilmaniangilman
1,3091810
answered Nov 28 '18 at 18:23
iangilmaniangilman
1,3091810
answered Nov 28 '18 at 18:23
iangilmaniangilman
1,3091810
1,3091810
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 '18 at 12:58
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 '18 at 15:03
I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had theminusbackward so it was going in the wrong direction. Let me know if this works now!
– iangilman
Dec 11 '18 at 0:57
yes, now it's perfect.
– Fateh
Dec 13 '18 at 12:02
Excellent; glad to hear it! :)
– iangilman
Dec 13 '18 at 17:35
add a comment |
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 '18 at 12:58
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 '18 at 15:03
I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had theminusbackward so it was going in the wrong direction. Let me know if this works now!
– iangilman
Dec 11 '18 at 0:57
yes, now it's perfect.
– Fateh
Dec 13 '18 at 12:02
Excellent; glad to hear it! :)
– iangilman
Dec 13 '18 at 17:35
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 '18 at 12:58
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 '18 at 12:58
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 '18 at 15:03
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 '18 at 15:03
I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had the
minus backward so it was going in the wrong direction. Let me know if this works now!– iangilman
Dec 11 '18 at 0:57
I see! I made the mistake in my first example of converting the position to viewport coordinates too soon; the fact that the viewport was moving around caused the points to be inaccurate. I'm now saving the position in web coordinates and converting to viewport at the last minute, which creates the right result. I also had the
minus backward so it was going in the wrong direction. Let me know if this works now!– iangilman
Dec 11 '18 at 0:57
yes, now it's perfect.
– Fateh
Dec 13 '18 at 12:02
yes, now it's perfect.
– Fateh
Dec 13 '18 at 12:02
Excellent; glad to hear it! :)
– iangilman
Dec 13 '18 at 17:35
Excellent; glad to hear it! :)
– iangilman
Dec 13 '18 at 17:35
add a comment |
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