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台北市判斷
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| public class NewTaipeiCity { | |
| public static void main(String[] args) { | |
| // 新北 | |
| getCity(25.054501, 121.76686); | |
| getCity(25.025884, 121.680343); | |
| getCity(25.040193, 121.685587); | |
| // 臺北 | |
| getCity(25.029306, 121.5774); | |
| getCity(25.160823, 121.519017); | |
| getCity(25.06041,121.407663); | |
| } | |
| public static void getCity(double x, double y) { | |
| double tmp = x; | |
| x = y; | |
| y = tmp; | |
| int right_node = 0, left_node = 0; | |
| double lasty = 0.0, lastx = 0.0; | |
| for (int i = 0; i < newTaipeiCity.length; i++) { | |
| if (lastx == 0.0) { | |
| lastx = newTaipeiCity[i][0]; | |
| lasty = newTaipeiCity[i][1]; | |
| continue; | |
| } | |
| if ((newTaipeiCity[i][1] >= y && y >= lasty) || (lasty >= y && y >= newTaipeiCity[i][1])) { | |
| if (x >= newTaipeiCity[i][0] && x >= lastx) { | |
| right_node++; | |
| } else if (x <= newTaipeiCity[i][0] && x <= lastx) { | |
| left_node++; | |
| } else { | |
| double deltax, deltay, tempx; | |
| deltax = newTaipeiCity[i][0] - lastx; | |
| deltay = newTaipeiCity[i][1] - lasty; | |
| tempx = (y - lasty) * deltax / deltay + lastx; | |
| if (x >= tempx) { | |
| right_node ++; | |
| } else { | |
| left_node ++; | |
| } | |
| } | |
| } | |
| lastx = newTaipeiCity[i][0]; | |
| lasty = newTaipeiCity[i][1]; | |
| } | |
| if (left_node % 2 == 1 && right_node % 2 == 1) { | |
| System.out.println("新北市"); | |
| } else { | |
| System.out.println("你不在臺北市內喔！"); | |
| } | |
| } | |
| static double newTaipeiCity[][] = { | |
| { | |
| 121.53733049483, 25.300032002093 | |
| }, { | |
| 121.61756668038, 25.277590953571 | |
| }, { | |
| 121.67121072118, 25.202490045613 | |
| }, { | |
| 121.70193318825, 25.216994847091 | |
| }, { | |
| 121.68523030612, 25.190709072299 | |
| }, { | |
| 121.70100571974, 25.169279467232 | |
| }, { | |
| 121.62678349157, 25.139961967398 | |
| }, { | |
| 121.68718729003, 25.072643046038 | |
| }, { | |
| 121.73024094348, 25.052998718406 | |
| }, { | |
| 121.76458143015, 25.0577133542 | |
| }, { | |
| 121.77576897684, 25.070659770513 | |
| }, { | |
| 121.74990722033, 25.109867648173 | |
| }, { | |
| 121.79490982715, 25.112794380976 | |
| }, { | |
| 121.80369893442, 25.136033401195 | |
| }, { | |
| 121.82663070725, 25.135986758174 | |
| }, { | |
| 121.82165024699, 25.121089533354 | |
| }, { | |
| 121.9238931126, 25.129853544104 | |
| }, { | |
| 121.91294874653, 25.08834968138 | |
| }, { | |
| 121.93210680178, 25.032670579472 | |
| }, { | |
| 122.00668776227, 25.008523116287 | |
| }, { | |
| 121.96674054519, 24.982445759566 | |
| }, { | |
| 121.84691725985, 24.960294950818 | |
| }, { | |
| 121.83903420322, 24.944685345687 | |
| }, { | |
| 121.85392133245, 24.925716847405 | |
| }, { | |
| 121.83598719835, 24.907932051587 | |
| }, { | |
| 121.79198538152, 24.899868736245 | |
| }, { | |
| 121.77545352397, 24.865109809513 | |
| }, { | |
| 121.73051587064, 24.855299419709 | |
| }, { | |
| 121.68822603565, 24.816108129338 | |
| }, { | |
| 121.62579713219, 24.80878057732 | |
| }, { | |
| 121.62542846149, 24.795059147544 | |
| }, { | |
| 121.5921920992, 24.787804673827 | |
| }, { | |
| 121.59739932321, 24.727528748808 | |
| }, { | |
| 121.5432536323, 24.705662351765 | |
| }, { | |
| 121.53678844597, 24.688425406252 | |
| }, { | |
| 121.47984504689, 24.673775249566 | |
| }, { | |
| 121.42327895575, 24.761894771716 | |
| }, { | |
| 121.44949569593, 24.786030515329 | |
| }, { | |
| 121.43653488399, 24.812032448597 | |
| }, { | |
| 121.40294695301, 24.843459917096 | |
| }, { | |
| 121.37354379403, 24.83326643682 | |
| }, { | |
| 121.33606688552, 24.843828417193 | |
| }, { | |
| 121.35801530161, 24.85321218098 | |
| }, { | |
| 121.34502965278, 24.866932114319 | |
| }, { | |
| 121.35434957865, 24.873636470315 | |
| }, { | |
| 121.32029962734, 24.900198287167 | |
| }, { | |
| 121.31753431295, 24.91633795566 | |
| }, { | |
| 121.33975553019, 24.92848631809 | |
| }, { | |
| 121.31575482526, 24.938465783406 | |
| }, { | |
| 121.33158415025, 24.945627003873 | |
| }, { | |
| 121.32352450012, 24.972738766754 | |
| }, { | |
| 121.36931304469, 24.976886808486 | |
| }, { | |
| 121.40292361007, 24.998986561571 | |
| }, { | |
| 121.39115106845, 25.012072815541 | |
| }, { | |
| 121.41212958358, 25.019096532117 | |
| }, { | |
| 121.39063664406, 25.041858246687 | |
| }, { | |
| 121.40066182266, 25.051354027735 | |
| }, { | |
| 121.28264733005, 25.109904847269 | |
| }, { | |
| 121.29663439865, 25.126137246008 | |
| }, { | |
| 121.38949907793, 25.147027702212 | |
| }, { | |
| 121.45267941547, 25.252812950363 | |
| }, { | |
| 121.53733049483, 25.300032002093 | |
| }, { | |
| 121.55483607825, 25.208318016063 | |
| }, { | |
| 121.52027056401, 25.169928338343 | |
| }, { | |
| 121.50263545144, 25.172887118614 | |
| }, { | |
| 121.45705318542, 25.109224675278 | |
| }, { | |
| 121.50574281814, 25.075695605875 | |
| }, { | |
| 121.50487738207, 25.049645165412 | |
| }, { | |
| 121.48367012452, 25.036907841479 | |
| }, { | |
| 121.49057100185, 25.010975842478 | |
| }, { | |
| 121.51903399844, 25.01978590235 | |
| }, { | |
| 121.5604819403, 24.964987416783 | |
| }, { | |
| 121.59868336218, 24.960450281453 | |
| }, { | |
| 121.61998828188, 24.969445463606 | |
| }, { | |
| 121.60003963643, 24.97693546907 | |
| }, { | |
| 121.5975253634, 25.014585448118 | |
| }, { | |
| 121.66588221885, 25.029841896548 | |
| }, { | |
| 121.6191712559, 25.043510929108 | |
| }, { | |
| 121.62589875435, 25.096677522234 | |
| }, { | |
| 121.59734405832, 25.109622792222 | |
| }, { | |
| 121.60812344124, 25.131321171906 | |
| }, { | |
| 121.57698439417, 25.167138958642 | |
| }, { | |
| 121.5837912149, 25.194524776809 | |
| }, { | |
| 121.55483607825, 25.208318016063 | |
| } | |
| }; | |
| } |
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54 行的:
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