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Have you ever wanted to be a shitty pedant? Now you can tell time in degrees or radians!
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| #include <stdio.h> | |
| #include <string.h> | |
| #include <math.h> | |
| // 2pi / (1440 / 2) | |
| #define ratiorad 0.0087266 // radians that one minute equals | |
| // 360 / (1440 / 2) | |
| #define ratiodeg 0.5 // degrees that one minute equals | |
| #define PI2 6.2831853 | |
| #define rad2deg 57.2957795 | |
| int main(int argc, char** argv) | |
| { | |
| int h, m; | |
| float a; | |
| if(argc < 2) return -1; | |
| if(strchr(argv[1], ':')) | |
| { | |
| if(sscanf(argv[1], "%d:%d", &h, &m) != 2) return -1; | |
| m += (h % 12) * 60; | |
| if(m >= 0 && m <= 180) // 1st quadrant [12h, 3h] | |
| { | |
| printf("%g°\t", (180 - m) * ratiodeg); | |
| printf("%g rad\n", (180 - m) * ratiorad); | |
| } | |
| else | |
| if(m > 180 && m < 540) // 4th and 3rd quadrant (3h, 6h) U (6h, 9h) | |
| { | |
| printf("%g° (%g°)\t", 360 - (m - 180) * ratiodeg, -(m - 180) * ratiodeg); | |
| printf("%g rad (%.5g rad)\n", PI2 - (m - 180) * ratiorad, -(m - 180) * ratiorad); | |
| } | |
| else | |
| if (m >= 540) // 2nd quadrant [9h, 12h) | |
| { | |
| printf("%g°\t", 360 + (180 - m) * ratiodeg); | |
| printf("%g rad\n", PI2 + (180 - m) * ratiorad); | |
| } | |
| } | |
| else | |
| { | |
| if(sscanf(argv[1], "%g", &a) != 1) return -1; | |
| // If we've radians convert them to degrees | |
| if(argc == 3) | |
| a *= rad2deg; // It's easier to operate with degrees | |
| // mod 360 | |
| a -= (int)(a / 360) * 360; | |
| if(a < 0) a += 360; | |
| if(a >= 0 && a <= 90) // 1st quadrant | |
| m = 180 - (a / ratiodeg); | |
| else | |
| if(a > 180 && a < 360) // 3rd and 4th quadrant | |
| m = (360 - a) / ratiodeg + 180; | |
| else | |
| if(a <= 180) // 2nd quadrant | |
| m = 180 - (a - 360) / ratiodeg; | |
| printf("%02d:%02d\n", !(m / 60) ? 12 : m / 60, m % 60); | |
| } | |
| } |
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| </head> | |
| <body> | |
| <input type="text" id="hour"> | |
| <button onclick="hour2angle();">To angle!</button> | |
| <button onclick="angle2hour(0);">From radians to time!</button> | |
| <button onclick="angle2hour(1);">From degrees to time!</button> | |
| <div id="result"></div> | |
| <script type="text/javascript"> | |
| // 2pi / (1440 / 2) | |
| var ratiorad = 0.0087266; | |
| // 360 / (1440 / 2) | |
| var ratiodeg = 0.5; | |
| var pi2 = 6.2831853; | |
| var rad2deg = 57.2957795; | |
| var h, m; | |
| var a; | |
| function hour2angle() | |
| { | |
| hour = document.getElementById('hour').value; | |
| result = document.getElementById('result'); | |
| h = parseInt(hour); | |
| m = parseInt(hour.split(":")[1]); | |
| m += (h % 12) * 60; | |
| if(m >= 0 && m <= 180) // 1st quadrant [12h, 3h] | |
| { | |
| result.innerHTML = (180 - m) * ratiodeg; | |
| result.innerHTML += "° "; | |
| result.innerHTML += (180 - m) * ratiorad; | |
| result.innerHTML += "rad"; | |
| } | |
| else | |
| if(m > 180 && m < 540) // 4th and 3rd quadrant (3h, 6h) U (6h, 9h) | |
| { | |
| result.innerHTML = 360 - (m - 180) * ratiodeg + "° (" + -(m - 180) * ratiodeg; | |
| result.innerHTML += "°) "; | |
| result.innerHTML += pi2 - (m - 180) * ratiorad + "rad (" + -(m - 180) * ratiorad; | |
| result.innerHTML += "rad)"; | |
| } | |
| else | |
| if (m >= 540) // 2nd quadrant [9h, 12h) | |
| { | |
| result.innerHTML = 360 + (180 - m) * ratiodeg; | |
| result.innerHTML += "° "; | |
| result.innerHTML += pi2 + (180 - m) * ratiorad; | |
| result.innerHTML += "rad"; | |
| } | |
| } | |
| function angle2hour(degrees) | |
| { | |
| a = parseFloat(document.getElementById('hour').value); | |
| result = document.getElementById('result'); | |
| // If we've radians convert them to degrees | |
| if(!degrees) | |
| a *= rad2deg; // It's easier to operate with degrees | |
| // mod 360 | |
| a -= Math.floor(a / 360) * 360; | |
| if(a < 0) a += 360; | |
| if(a >= 0 && a <= 90) // 1st quadrant | |
| m = 180 - (a / ratiodeg); | |
| else | |
| if(a > 180 && a < 360) // 3rd and 4th quadrant | |
| m = (360 - a) / ratiodeg + 180; | |
| else | |
| if(a <= 180) // 2nd quadrant | |
| m = 180 - (a - 360) / ratiodeg; | |
| result.innerHTML = (!(m / 60) ? 12 : Math.round(m / 60)) + ":" + Math.round(m % 60); | |
| } | |
| </script> | |
| </body> | |
| </html> |
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