I have a bar chart that will never go below zero (never go negative), 0 y axis. How do I limit panning/scrolling so that the y0 line is always at the base of the graph?
The requirement is to not be able to pan below pointy = 0 in view;
Subscribe for ZoomEvent or Scroll event (you must check which one would be more suitable in your situation).
Create a handler for that event and inside of it, check if current pane.YAxis.Scale.Min < 0. If so, change it manually. That should do the trick.
Related
I would like to make an different animation depending if the switch is off or on.
Let say if my switch is ON my sprite move x +10
if my switch is OFF my sprite move y +10
I don't find a correct way to apply it.
Thanks
You could use one out of three PatchTrees with a simple logic.
The first one works like this: after pressing LMB, your sprite translates 0.1 along +X. After releasing LMB sprite returns to its default position (0). The same thing happens with pressing and releasing RMB (Y+0.1).
The second scheme uses slightly different logic: clicking LMB you translate your sprite X+0.1 and clicking RMB you translate your sprite Y+0.1. This logic can be accomplished if you use "Counter" patch (with "Reset" parameter).
Remember! your QC's default XY grid ranges from -1 to +1 for X and Y (totally 2 for each axis).
The third one is a switcher based on a formula of inversion: abs(a-b).
b=1. I used patch named "Mathematical expression". This PatchTree is made just for one input (LMB for instance). Maybe third scheme is what you are looking for.
Logic is simple:
if a = 0 -> abs(0-1) -> abs(-1) = 1
...
if a = 1 -> abs(1-1) -> abs(0) = 0
I am using a ZedGraphControl in a WindowsForms project in C#. The ZedGraphControl is V5.1.5.
The data in the control is static and I add it all before the form is shown. The X axis of the data consists of numbers indicating seconds offset from the beginning. in other words from 0 to some number of seconds.
I want to initially show the last 5 seconds, but provide a horizontal scrollbar so the user can scroll back and forth. I set the "graphPane.XAxis.Scale.Max = maxX;" where maxX is the largest X value in my data. I set the "graphPane.XAxis.Scale.Min = maxX - 5;".
The data starts off displaying the way I want it, but when the user scrolls the horizontal bar, bizzar behavior occurs.
As you drag the thumb of the scrollbar to the left, the beginning of the data shown in the grid moves to the lower values as expected, and the thumb of the scrollbar moves to the left, but the right edge of the thumb stays at the right of the scrollbar and you cannot move back to the right. It is as if the data to the right of the viewing range gets truncated as you scroll left.
I cannot find any reason for this nor any way to control it. Does anyone have any ideas about this behavior?
Ok, found it myself.
I found a fine article that describes scrolling:
Add a ScrollBar
In it the author specifically says "the scrolling will be wacky because the scrollable range has not been set".
I used the sample "Manually Setting the Scroll Range" and the part that I was missing is setting the zedGraphControl1.ScrollMinX and zedGraphControl1.ScrollMaxX properties. Once I defined these values everything started working as expected. I also found that in my case, the value of zedGraphControl1.IsAutoScrollRange had no effect, but I left it set to false to be consistent with the example. This would probably have an effect if the dataset is dynamic.
I am using a while loop and within that I add ginput in MATLAB to capture the positions of mouse. I check every time if the returned position is within some area so I will plot some curve on the current figure. But the problem is, by using ginput, I have to press enter before the positions are returned. Is that any way to capture the mouse event such that when the current cursor hover over some points, a callback function will be triggered? Thanks.
Since you already have a figure you're using, you could set the listening property for the figure:
set(gcf,'WindowButtonMotionFcn', #mouseMoveListener);
But now you have to create a function called 'mouseMoveListener' (if you want to name it something else, change the words after the # sign to whatever name you want, and make sure the actual event function is named that too).
Within your function mouseMoveListener you can now get the mouse coordinates:
MousePos = get(mainAxis,'CurrentPoint');
Which tells the current point of the mouse with respect to the axes coordinates. From there, you can have whatever if statement check that the position is where you want it and perform whatever tasks you want based on that information.
I want to position a window at the bottom of the screen. If the start menu is present, I want it to lie along the top of the start menu. If it is not (or it is auto-hidden), I still want it to be in the same position as it would be if the start menu was there, meaning there will be a gap of a few pixels.
Currently I get the monitor work area, position the window at the bottom, and always offset by 20 pixels or so. If the start menu isn't there, this works well. If it is, however, the work area also shrinks (as it should), and I end up double-offsetting.
How would I fix the issue?
To get the work area of the screen not obscured by the system taskbar or by application desktop toolbars, you can use SystemParametersInfo() with SPI_GETWORKAREA as uiAction parameter. The pvParam parameter must point to a RECT structure that receives the coordinates of the work area, expressed in virtual screen coordinates. For example:
RECT rectWorkArea;
SystemParametersInfo(SPI_GETWORKAREA, 0, &rectWorkArea, 0);
As you said in the comment, to get the bounding rectangle of the taskbar, we can call SHAppBarMessage(ABM_GETTASKBARPOS, ...)
To determine the position of the taskbar (whether it is currently at the bottom, top, left, or right of the screen), you could use the following calculation:
type
TTaskBarPos = (_TOP, _BOTTOM, _LEFT, _RIGHT);
var
iScrW, iScrH: Longint;
iScrW := GetSystemMetrics(SM_CXSCREEN);
iScrH := GetSystemMetrics(SM_CXSCREEN);
if (rectTaskbar.Top > iScrH div 2) and (rectTaskbar.Right >= iScrW) then
Result := _BOTTOM
else if (rectTaskbar.Top < iScrH div 2) and (rectTaskbar.Bottom <= iScrW div 2) then
Result := _TOP
else if (rectTaskbar.Left < iScrW div 2) and (rectTaskbar.Top <= 0) then
Result := _LEFT
else
Result := _RIGHT;
They should be enough to solve your current problem. However, if you need to know (for another reason) the current taskbar settings of the autohide and always-on-top states, you can use SHAppBarMessage(ABM_GETSTATE, ...).
If you need to be notified that that the taskbar's autohide or always-on-top state has changed, you have to intercept ABN_STATECHANGE message.
Are you are using or have access to .NET in your project?
If so, you can use the Screen.PrimaryScreen.WorkingArea.Height property to determine the bottom of the screen excluding the task bar.
You can also grab the total screen height by getting the Screen.PrimaryScreen.Bounds.Height property (which includes the task bar in the total height value).
Comparing these values, if they're the same, the task bar isn't present. Otherwise, the task bar is and you can adjust accordingly.
Using MS Visual Studio, I have attached a spin control to an edit control using the "auto buddy" property.
The spin control alters the edit box, but the up button decrements the value and the down button increments the value.
How do you fix this?
Because that's how it is. 8-) You work around it using SetRange.
The documentation says "The default range for the spin button has the maximum set to zero (0) and the minimum set to 100. Because the maximum value is less than the minimum value, clicking the up arrow will decrease the position and clicking the down arrow will increase it. Use CSpinButtonCtrl::SetRange to adjust these values." ...without any decent explanation.
The reason it works this way is because a spin control is just a thinly veiled scroll bar, and windows use a coordinate system where rows increase as you move down (so the down arrow increases the value).
To fix it, just interchange the min and max values you are currently useing when you call SetRange.