A fixed point basic calculator for DASH.


 
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Operating Systems OS X (Apple) A fixed point basic calculator for DASH.
# 22  
Old 12-12-2018
Naturally 0.00094 is zero when truncated to three fixed decimal places. That is not "edge case" -- it's supposed to do that.

If you want more decimal points in my code, change DP and MOD.
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Tk_GetDash(3)						       Tk Library Procedures						     Tk_GetDash(3)

__________________________________________________________________________________________________________________________________________________

NAME
Tk_GetDash - convert from string to valid dash structure. SYNOPSIS
#include <tk.h> int Tk_GetDash(interp, string, dashPtr) ARGUMENTS
Tcl_Interp *interp (in) Interpreter to use for error reporting. const char * string (in) Textual value to be converted. Tk_Dash *dashPtr (out) Points to place to store the dash pattern value converted from string. _________________________________________________________________ DESCRIPTION
These procedure parses the string and fills in the result in the Tk_Dash structure. The string can be a list of integers or a character string containing only ".,-_" or spaces. If all goes well, TCL_OK is returned. If string does not have the proper syntax then TCL_ERROR is returned, an error message is left in the interpreter's result, and nothing is stored at *dashPtr. The first possible syntax is a list of integers. Each element represents the number of pixels of a line segment. Only the odd segments are drawn using the "outline" color. The other segments are drawn transparent. The second possible syntax is a character list containing only 5 possible characters ".,-_ ". The space can be used to enlarge the space between other line elements, and can not occur as the first position in the string. Some examples: -dash . = -dash {2 4} -dash - = -dash {6 4} -dash -. = -dash {6 4 2 4} -dash -.. = -dash {6 4 2 4 2 4} -dash {. } = -dash {2 8} -dash , = -dash {4 4} The main difference of this syntax with the previous is that it is shape-conserving. This means that all values in the dash list will be multiplied by the line width before display. This assures that "." will always be displayed as a dot and "-" always as a dash regardless of the line width. On systems where only a limited set of dash patterns, the dash pattern will be displayed as the most close dash pattern that is available. For example, on Windows only the first 4 of the above examples are available. The last 2 examples will be displayed identically as the first one. KEYWORDS
dash, conversion Tk 8.3 Tk_GetDash(3)