I'm working in MATLAB and I want to get the cursor position from anywhere on the screen.
I would like to continuously get the position of the cursor while the mouse is moving. However, I found that MATLAB can get the mouse position while the mouse is moving only in a GUI.
How can I achieve the same thing but not in a GUI in MATLAB?
Are you sure MATLAB can only get the mouse co-ordinates within a GUI? It's actually quite simple to get the position of your mouse anywhere on your screen, independent of a GUI.
Use the following:
get(0, 'PointerLocation')
Try this by moving your mouse around and invoking this command each time. You will see that the output keeps changing when the mouse moves. You'll see that this works independent of a GUI.
The output of this function will return a two-element array where the first element is the x or column position and the second element is the y or row position of your mouse. Bear in mind that the reference point is with respect to the bottom left corner of your screen. As such, placing your mouse at the bottom left corner of the screen should yield (1,1) while placing your mouse at the top right corner of the screen yields the resolution of your screen.
Now, if you want to continuously get the position of the mouse, consider placing this call in a while loop while pausing for a small amount of time so you don't overload the CPU. Therefore, do something like this:
while condition
loc = get(0, 'PointerLocation');
%// Do something
%...
%...
pause(0.01); %// Pause for 0.01 ms
end
Related
I am using a Raspberry Pi Pico to move my mouse to an absolute position on a button press. However, I have noticed mouse.move moves your current mouse position by x and y units, but I want to change my mouse position to be exact and not based on the current position. Is there a way to dot his
Normally when you select an object, any gizmos like the move axis are at the object's center. However, I've done something and that point is moving around to the object's edges and vertices when the mouse hovers over it. Its making it frustrating to work. How can I switch this back?
Apparently I clicked shift v at one point. Clicking v again fixed it
I know the traditional way in Unity to position a shape is to give it a center point, then scale and rotate as needed. However, I'd like for the following:
The player can click once to "start" a shape (basically a line, but I could use a cube or whatever) and then click a second time to "end" the shape, completing it and bringing it into existence in the game space. How could this be done?
I am trying to drag some shapes in HTML canvas but I am encountering a problem with respect to determining the change in mouse coordinates [dx,dy]
First of all, there is no problem in the coordinates themselves, stored in mousePos as the rollover effects work flawlessly. What I am doing is, upon first entering the shape, saving the mouse coordinates.
pos = {x : mousePos[0] , y : mousePos[1]};
Then, onMotion updates the coordinates everytime the mouse moves as well as recording the current position
dx=mousePos[0]-pos.x;
dy=mousePos[1]-pos.y;
pos = {x : mousePos[0] , y : mousePos[1]};
Then I add the dx and dy values to the shapes coordinates (lets take a simple rectangle as an example)
ctx.fillRect(0+this.dx,0+this.dy,100+this.dx,100+this.dy);
as long as the mouse doesn't move too fast, it works relatively well (not perfect though). If I move the mouse very quickly, without going out of the window, the rectangle does not catch up with the mouse. I can understand if there is a delay catching up to the mouse, but how can the delta values be off? Clearly we know where we started, and even if dozens/hundreds of pixels are skipped in the process, eventually the mouse should stop and the correct delta values should be calculated.
Any help would be greatly appreciated as I have hit a conceptual wall here.
You might try to get e.layerX-Y when the onMotion is fired to get the real position instead of the delta. This way it can't be "off".
To use this, place your shape into a div with style="padding:0px;margin=0px;" , because the position is relative to the parent block.
I am trying to figure out how can you drag an image while constraining its movement along a certain path.
I tried several tricks including animation along a path, but couldn't get the animation to play and pause and play backwards - so that seems out of the question.
Any ideas ? anyone ?
What you're basically trying to do is match finger movement to a 'translation' transition.
As the user touches down and starts to move their finger you want to use the current touch point value to create a translation transform which you apply to your UIImageView. Here's how you would do it:
On touch down, save the imageview's starting x,y position.
On move, calculate the delta from old point to new one. This is where you can clamp the values. So you can ignore, say, the y change and only use the x deltas. This means that the image will only move left to right. If you ignore the x and use y, then it only moves up and down.
Once you have the 'new' calculated/clamped x,y values, use it to create a new transform using CGAffineTransformMakeTranslation(x, y). Assign this transform to the UIImageView. The image moves to that place.
Once the finger lifts, figure out the delta from the original starting x,y, point and the lift-off point, then adjust the ImageView's bounds and reset the transform to CGAffineTransformIdentity. This doesn't move the object, but it sets it so subsequent accesses to the ImageView use the actual position and don't have to keep adjusting for transforms.
Moving along on a grid is easy too. Just round out the x,y values in step 2 so they're a multiple of the grid size (i.e. round out to every 10 pixel) before you pass it on to make the translation transform.
If you want to make it extra smooth, surround the code where you assign the transition with UIView animation blocks. Mess around with the easing and timing settings. The image should drag behind a bit but smoothly 'rubber-band' from one touch point to the next.
See this Sample Code : Move Me