LabWindows/CVI Idea Exchange

Right now it is possible to have plots resembling histograms by choosing as plot style VAL_VERTICAL_BAR.

However, at present the width of these bars can only be adjusted by changing the line thickness in pixels (ATTR_PLOT_THICKNESS)

From a users point of view it would be more useful having the possibility to specify the width in units of the x axis.

Explanation: Say one is plotting an xy graph, with the data equally spaced and in incremetns of 1. If the x scale is 0-100 there would be 100 thin lines which may be appropriate in most cases. If the x scale is 0-5 there would be only five thin vertical lines. This appearance is very much different from what one would expect from an histogram. The suggestion is to set the width of the histogram bars to say +/- 0.4 x units, then there would be nice bars ranging from 0.6-1.4, 1.6-2.4, etc. in the case of an axis scale of 0-5, and the width of the bars would shrink accordingly if the axis scale is 0-100; in this case, there would be 100 rather thin lines resembling more or less the current appearance.

So in effect this suggestion is about an automatically adjusting line width (right now it is not possible to implement it manually because the line width is specified in pixels rather axis untis and is also limited to a maximum of 32 pixel.)

One step further could be to draw rectangles instead of lines with the possibility to independently choose line color and fill color.

For some specific projects it's required that the code is compliant to MISRA C guidelines (see here)

A feature to check the compliance of the C code with MISRA C guidelines would be useful.

The best option would be to have the possibility to select a subset of the rules or to disable some of them.

This suggestion comes from this discussion: basically, it seems strange to me that I may have a disabled quit button and the close control (the red cross in the upper right corner of the panel) which is active at the same time.

It seems to me that the close control should honour the state of an existing quit button declared in Close control panel attribute. At present the only solution is to test the state of the button within the button callback itself.

If this idea is not accepted, at least a note should be added to the documentation, e.g. in ATTR_CLOSE_CTRL help page, specifying that the callback is fired regardless the state of the control.

sometimes i use the table object in CVI but there is one function that is missing and i think it's really usefull, the one that give you the ring index directly.

now i'm doing it in this way, maybe there is a better way to do it but i've not spent too much time to do it.

/// HIFN This function give you the item ring index.
/// HIRET an integer value containing the function result.
/// HIPAR panel/panel handle where the control is located.
/// HIPAR control/which control i have to analyze.
/// HIPAR column/in what column i have to look.
/// HIPAR row/in what row i have to look.
static int GetTableIndex(int panel, int control, int column, int row)
{
	int Result = {0};
	long IndexLength = {0};
	char *IndexTemp = {0};
	
	GetTableCellValLength(panel, control, MakePoint (column, row), &IndexLength);
	IndexTemp = calloc(IndexLength + 1, sizeof(char));
	GetTableCellAttribute (panel, control, MakePoint (column, row), ATTR_CTRL_VAL, IndexTemp);
	GetTableCellRingIndexFromValue (panel, control, 0, MakePoint (column, row), &Result, IndexTemp);
	free(IndexTemp);
	IndexTemp = 0;
	return Result;
}