How to drag an Openseadrago canvas with mouse middle wheel button
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1
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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 at 11:46
Vadim Kotov
4,28153247
asked Nov 20 at 6:19
Fateh
61
add a comment |
up vote
1
down vote
favorite
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 at 11:46
Vadim Kotov
4,28153247
asked Nov 20 at 6:19
Fateh
61
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
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 at 11:46
Vadim Kotov
4,28153247
asked Nov 20 at 6:19
Fateh
61
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 at 11:46
Vadim Kotov
4,28153247
asked Nov 20 at 6:19
Fateh
61
edited Nov 26 at 11:46
Vadim Kotov
4,28153247
asked Nov 20 at 6:19
Fateh
61
edited Nov 26 at 11:46
Vadim Kotov
4,28153247
edited Nov 26 at 11:46
Vadim Kotov
4,28153247
edited Nov 26 at 11:46
Vadim Kotov
4,28153247
4,28153247
asked Nov 20 at 6:19
Fateh
61
asked Nov 20 at 6:19
Fateh
61
asked Nov 20 at 6:19
Fateh
61
61
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
up vote
0
down vote
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 at 18:23
iangilman
1,234810
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 at 12:58
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 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
4 mins ago
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
0
down vote
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 at 18:23
iangilman
1,234810
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 at 12:58
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 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
4 mins ago
add a comment |
up vote
0
down vote
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 at 18:23
iangilman
1,234810
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 at 12:58
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 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
4 mins ago
add a comment |
up vote
0
down vote
up vote
0
down vote
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 at 18:23
iangilman
1,234810
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 at 18:23
iangilman
1,234810
edited 6 mins ago
answered Nov 28 at 18:23
iangilman
1,234810
answered Nov 28 at 18:23
iangilman
1,234810
answered Nov 28 at 18:23
iangilman
1,234810
1,234810
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 at 12:58
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 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
4 mins ago
add a comment |
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 at 12:58
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 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
4 mins ago
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 at 12:58
I am able to drag the canvas with mouse middle wheel button but canvas movement is very fast.
– Fateh
Dec 6 at 12:58
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 at 15:03
Here is the plunker: plnkr.co/edit/t5kUse2ztmdyoDKTyAjZ?p=preview
– Fateh
Dec 6 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
4 mins ago
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
4 mins ago
add a comment |
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