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< a href = "#define-members" > Macros< / a > |
< a href = "#func-members" > Functions< / a > < / div >
< div class = "headertitle" >
< div class = "title" > cartesian_to_polar.c File Reference< / div > < / div >
< / div > <!-- header -->
< div class = "contents" >
< p > Function to convert a Cartesian co-ordinate to polar form.
< a href = "#details" > More...< / a > < / p >
< div class = "textblock" > < code > #include < assert.h> < / code > < br / >
< code > #include < math.h> < / code > < br / >
< code > #include < stdio.h> < / code > < br / >
< code > #include < stdlib.h> < / code > < br / >
< / div > < div class = "textblock" > < div class = "dynheader" >
Include dependency graph for cartesian_to_polar.c:< / div >
< div class = "dyncontent" >
< div class = "center" > < iframe scrolling = "no" frameborder = "0" src = "../../d8/d7c/cartesian__to__polar_8c__incl.svg" width = "342" height = "112" > < p > < b > This browser is not able to show SVG: try Firefox, Chrome, Safari, or Opera instead.< / b > < / p > < / iframe >
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< / div >
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< tr class = "heading" > < td colspan = "2" > < h2 class = "groupheader" > < a name = "define-members" > < / a >
Macros< / h2 > < / td > < / tr >
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< tr class = "memdesc:a525335710b53cb064ca56b936120431e" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > required for MS Visual C < br / > < / td > < / tr >
< tr class = "separator:a525335710b53cb064ca56b936120431e" > < td class = "memSeparator" colspan = "2" >   < / td > < / tr >
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Functions< / h2 > < / td > < / tr >
< tr class = "memitem:afb80d77f0c994240309ccddcc9525e70" > < td class = "memItemLeft" align = "right" valign = "top" > void  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../d6/d2e/cartesian__to__polar_8c.html#afb80d77f0c994240309ccddcc9525e70" > to_polar< / a > (double x, double y, double *r, double *theta)< / td > < / tr >
< tr class = "memdesc:afb80d77f0c994240309ccddcc9525e70" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Function to convert cartesian coordinates to polar. < a href = "../../d6/d2e/cartesian__to__polar_8c.html#afb80d77f0c994240309ccddcc9525e70" > More...< / a > < br / > < / td > < / tr >
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< tr class = "memdesc:a60e62b809ca9dcb1b20a140b30d30f60" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Generate a random number in the given limits. < a href = "../../d6/d2e/cartesian__to__polar_8c.html#a60e62b809ca9dcb1b20a140b30d30f60" > More...< / a > < br / > < / td > < / tr >
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< tr class = "memdesc:ae1a3968e7947464bee7714f6d43b7002" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Test implementation. < br / > < / td > < / tr >
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int  < / td > < td class = "memItemRight" valign = "bottom" > < a class = "el" href = "../../d6/d2e/cartesian__to__polar_8c.html#ae66f6b31b5ad750f1fe042a706a4e3d4" > main< / a > ()< / td > < / tr >
< tr class = "memdesc:ae66f6b31b5ad750f1fe042a706a4e3d4" > < td class = "mdescLeft" >   < / td > < td class = "mdescRight" > Main function. < br / > < / td > < / tr >
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< / table >
< a name = "details" id = "details" > < / a > < h2 class = "groupheader" > Detailed Description< / h2 >
< div class = "textblock" > < p > Function to convert a Cartesian co-ordinate to polar form. < / p >
< / div > < h2 class = "groupheader" > Function Documentation< / h2 >
< a id = "a60e62b809ca9dcb1b20a140b30d30f60" > < / a >
< h2 class = "memtitle" > < span class = "permalink" > < a href = "#a60e62b809ca9dcb1b20a140b30d30f60" > ◆ < / a > < / span > get_rand()< / h2 >
< div class = "memitem" >
< div class = "memproto" >
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< tr >
< td class = "memname" > double get_rand < / td >
< td > (< / td >
< td class = "paramtype" > double  < / td >
< td class = "paramname" > < em > lim1< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > double  < / td >
< td class = "paramname" > < em > lim2< / em >   < / td >
< / tr >
< tr >
< td > < / td >
< td > )< / td >
< td > < / td > < td > < / td >
< / tr >
< / table >
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< p > Generate a random number in the given limits. < / p >
< dl class = "params" > < dt > Parameters< / dt > < dd >
< table class = "params" >
< tr > < td class = "paramname" > lim1< / td > < td > lower limit < / td > < / tr >
< tr > < td class = "paramname" > lim2< / td > < td > upper limit < / td > < / tr >
< / table >
< / dd >
< / dl >
< dl class = "section return" > < dt > Returns< / dt > < dd > random number in the given range < / dd > < / dl >
< div class = "fragment" > < div class = "line" > < a name = "l00089" > < / a > < span class = "lineno" > 89< / span >   {< / div >
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< div class = "line" > < a name = "l00091" > < / a > < span class = "lineno" > 91< / span >   < span class = "keywordflow" > return< / span > (lim2 - lim1) * r + lim1; < span class = "comment" > // scale to range< / span > < / div >
< div class = "line" > < a name = "l00092" > < / a > < span class = "lineno" > 92< / span >   }< / div >
< / div > <!-- fragment -->
< / div >
< / div >
< a id = "afb80d77f0c994240309ccddcc9525e70" > < / a >
< h2 class = "memtitle" > < span class = "permalink" > < a href = "#afb80d77f0c994240309ccddcc9525e70" > ◆ < / a > < / span > to_polar()< / h2 >
< div class = "memitem" >
< div class = "memproto" >
< table class = "memname" >
< tr >
< td class = "memname" > void to_polar < / td >
< td > (< / td >
< td class = "paramtype" > double  < / td >
< td class = "paramname" > < em > x< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > double  < / td >
< td class = "paramname" > < em > y< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > double *  < / td >
< td class = "paramname" > < em > r< / em > , < / td >
< / tr >
< tr >
< td class = "paramkey" > < / td >
< td > < / td >
< td class = "paramtype" > double *  < / td >
< td class = "paramname" > < em > theta< / em >   < / td >
< / tr >
< tr >
< td > < / td >
< td > )< / td >
< td > < / td > < td > < / td >
< / tr >
< / table >
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< p > Function to convert cartesian coordinates to polar. < / p >
< p class = "formulaDsp" >
\begin{eqnarray*} r & =& \sqrt{x^2+y^2}\\ \theta & =& \atan\frac{y}{x} \end{eqnarray*}
< / p >
< dl class = "params" > < dt > Parameters< / dt > < dd >
< table class = "params" >
< tr > < td class = "paramdir" > [in]< / td > < td class = "paramname" > x< / td > < td > absicca value < / td > < / tr >
< tr > < td class = "paramdir" > [in]< / td > < td class = "paramname" > y< / td > < td > ordinate value < / td > < / tr >
< tr > < td class = "paramdir" > [out]< / td > < td class = "paramname" > r< / td > < td > pointer to store polar radius < / td > < / tr >
< tr > < td class = "paramdir" > [out]< / td > < td class = "paramname" > theta< / td > < td > pointer to store polar angle (in radian) < / td > < / tr >
< / table >
< / dd >
< / dl >
< div class = "fragment" > < div class = "line" > < a name = "l00023" > < / a > < span class = "lineno" > 23< / span >   {< / div >
< div class = "line" > < a name = "l00024" > < / a > < span class = "lineno" > 24< / span >   < span class = "keywordtype" > double< / span > thetaFinal = 0.f;< / div >
< div class = "line" > < a name = "l00025" > < / a > < span class = "lineno" > 25< / span >   < / div >
< div class = "line" > < a name = "l00026" > < / a > < span class = "lineno" > 26< / span >   *r = sqrt(x * x + y * y);< / div >
< div class = "line" > < a name = "l00027" > < / a > < span class = "lineno" > 27< / span >   < / div >
< div class = "line" > < a name = "l00028" > < / a > < span class = "lineno" > 28< / span >   < span class = "keywordflow" > if< / span > (x != 0)< / div >
< div class = "line" > < a name = "l00029" > < / a > < span class = "lineno" > 29< / span >   {< / div >
< div class = "line" > < a name = "l00030" > < / a > < span class = "lineno" > 30< / span >   < span class = "keywordflow" > if< / span > (y != 0)< / div >
< div class = "line" > < a name = "l00031" > < / a > < span class = "lineno" > 31< / span >   {< / div >
< div class = "line" > < a name = "l00032" > < / a > < span class = "lineno" > 32< / span >   *theta = atan(y / x);< / div >
< div class = "line" > < a name = "l00033" > < / a > < span class = "lineno" > 33< / span >   < span class = "keywordflow" > if< / span > ((x > 0 & & y > 0) || (x == -y))< / div >
< div class = "line" > < a name = "l00034" > < / a > < span class = "lineno" > 34< / span >   { < span class = "comment" > // Q1< / span > < / div >
< div class = "line" > < a name = "l00035" > < / a > < span class = "lineno" > 35< / span >   thetaFinal = *theta;< / div >
< div class = "line" > < a name = "l00036" > < / a > < span class = "lineno" > 36< / span >   }< / div >
< div class = "line" > < a name = "l00037" > < / a > < span class = "lineno" > 37< / span >   < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (x < 0 & & y > 0)< / div >
< div class = "line" > < a name = "l00038" > < / a > < span class = "lineno" > 38< / span >   { < span class = "comment" > // Q2< / span > < / div >
< div class = "line" > < a name = "l00039" > < / a > < span class = "lineno" > 39< / span >   thetaFinal = *theta + M_PI;< / div >
< div class = "line" > < a name = "l00040" > < / a > < span class = "lineno" > 40< / span >   }< / div >
< div class = "line" > < a name = "l00041" > < / a > < span class = "lineno" > 41< / span >   < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (x < 0 & & y < 0)< / div >
< div class = "line" > < a name = "l00042" > < / a > < span class = "lineno" > 42< / span >   { < span class = "comment" > // Q3< / span > < / div >
< div class = "line" > < a name = "l00043" > < / a > < span class = "lineno" > 43< / span >   thetaFinal = *theta - M_PI;< / div >
< div class = "line" > < a name = "l00044" > < / a > < span class = "lineno" > 44< / span >   }< / div >
< div class = "line" > < a name = "l00045" > < / a > < span class = "lineno" > 45< / span >   < span class = "keywordflow" > else< / span > < span class = "keywordflow" > if< / span > (x > 0 & & y < 0)< / div >
< div class = "line" > < a name = "l00046" > < / a > < span class = "lineno" > 46< / span >   { < span class = "comment" > // Q4< / span > < / div >
< div class = "line" > < a name = "l00047" > < / a > < span class = "lineno" > 47< / span >   thetaFinal = 2 * M_PI - *theta;< / div >
< div class = "line" > < a name = "l00048" > < / a > < span class = "lineno" > 48< / span >   }< / div >
< div class = "line" > < a name = "l00049" > < / a > < span class = "lineno" > 49< / span >   < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a name = "l00050" > < / a > < span class = "lineno" > 50< / span >   {< / div >
< div class = "line" > < a name = "l00051" > < / a > < span class = "lineno" > 51< / span >   fprintf(stderr, < span class = "stringliteral" > " Should not reach here!\n" < / span > );< / div >
< div class = "line" > < a name = "l00052" > < / a > < span class = "lineno" > 52< / span >   }< / div >
< div class = "line" > < a name = "l00053" > < / a > < span class = "lineno" > 53< / span >   }< / div >
< div class = "line" > < a name = "l00054" > < / a > < span class = "lineno" > 54< / span >   }< / div >
< div class = "line" > < a name = "l00055" > < / a > < span class = "lineno" > 55< / span >   < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a name = "l00056" > < / a > < span class = "lineno" > 56< / span >   { < span class = "comment" > // exceptions when no actual angle is present< / span > < / div >
< div class = "line" > < a name = "l00057" > < / a > < span class = "lineno" > 57< / span >   < span class = "keywordflow" > if< / span > (y > 0)< / div >
< div class = "line" > < a name = "l00058" > < / a > < span class = "lineno" > 58< / span >   {< / div >
< div class = "line" > < a name = "l00059" > < / a > < span class = "lineno" > 59< / span >   thetaFinal = M_PI / 2;< / div >
< div class = "line" > < a name = "l00060" > < / a > < span class = "lineno" > 60< / span >   }< / div >
< div class = "line" > < a name = "l00061" > < / a > < span class = "lineno" > 61< / span >   < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a name = "l00062" > < / a > < span class = "lineno" > 62< / span >   {< / div >
< div class = "line" > < a name = "l00063" > < / a > < span class = "lineno" > 63< / span >   thetaFinal = -(M_PI / 2);< / div >
< div class = "line" > < a name = "l00064" > < / a > < span class = "lineno" > 64< / span >   }< / div >
< div class = "line" > < a name = "l00065" > < / a > < span class = "lineno" > 65< / span >   }< / div >
< div class = "line" > < a name = "l00066" > < / a > < span class = "lineno" > 66< / span >   < span class = "keywordflow" > if< / span > (y == 0)< / div >
< div class = "line" > < a name = "l00067" > < / a > < span class = "lineno" > 67< / span >   {< / div >
< div class = "line" > < a name = "l00068" > < / a > < span class = "lineno" > 68< / span >   < span class = "keywordflow" > if< / span > (x > 0)< / div >
< div class = "line" > < a name = "l00069" > < / a > < span class = "lineno" > 69< / span >   {< / div >
< div class = "line" > < a name = "l00070" > < / a > < span class = "lineno" > 70< / span >   thetaFinal = 0;< / div >
< div class = "line" > < a name = "l00071" > < / a > < span class = "lineno" > 71< / span >   }< / div >
< div class = "line" > < a name = "l00072" > < / a > < span class = "lineno" > 72< / span >   < span class = "keywordflow" > else< / span > < / div >
< div class = "line" > < a name = "l00073" > < / a > < span class = "lineno" > 73< / span >   {< / div >
< div class = "line" > < a name = "l00074" > < / a > < span class = "lineno" > 74< / span >   thetaFinal = -M_PI;< / div >
< div class = "line" > < a name = "l00075" > < / a > < span class = "lineno" > 75< / span >   }< / div >
< div class = "line" > < a name = "l00076" > < / a > < span class = "lineno" > 76< / span >   }< / div >
< div class = "line" > < a name = "l00077" > < / a > < span class = "lineno" > 77< / span >   < / div >
< div class = "line" > < a name = "l00078" > < / a > < span class = "lineno" > 78< / span >   *theta = thetaFinal;< / div >
< div class = "line" > < a name = "l00079" > < / a > < span class = "lineno" > 79< / span >   }< / div >
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2021-02-06 03:52:57 +08:00
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