См. документацию.00001
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00011 #include "TXLib.h"
00012
00013
00014
00015 void DrawTree (double x, double y, double length, double angle);
00016 double Random (double min, double max);
00017
00018
00019
00020 int main ()
00021 {
00022 txCreateWindow (800, 600);
00023 txBegin();
00024
00025 while (!GetAsyncKeyState (VK_ESCAPE))
00026 {
00027 txSetFillColor (TX_BLACK);
00028 txClear();
00029
00030 DrawTree (400, 0, 100, txPI/2);
00031
00032 txSleep (100);
00033 }
00034
00035 txEnd();
00036 return 0;
00037 }
00038
00039
00040
00041 void DrawTree (double x, double y, double length, double angle)
00042 {
00043 if (length <= 0) return;
00044
00045 double wind = 0;
00046 int height = 0;
00047
00048 if (GetAsyncKeyState (VK_LEFT)) wind = +0.2;
00049 if (GetAsyncKeyState (VK_RIGHT)) wind = -0.2;
00050 if (GetAsyncKeyState (VK_SHIFT)) wind = Random (-0.7, +0.7);
00051 if (GetAsyncKeyState (VK_UP)) height = +5;
00052 if (GetAsyncKeyState (VK_DOWN)) height = -5;
00053
00054 double leaves = 0;
00055 if (height == 0) leaves = 20;
00056 if (height == 5) leaves = 25;
00057 if (height == -5) leaves = 15;
00058
00059 txSetColor ((length > leaves)? RGB (115, 65, 10) : RGB (35, 255, 10),
00060 (int) (pow (length/7, 0.9) + 0.5));
00061
00062
00063
00064 double x1 = x + length * cos (angle),
00065 y1 = y + length * sin (angle);
00066
00067 txLine (x, 600 - y, x1, 600 - y1);
00068
00069 DrawTree (x1, y1, length - 10 + Random (-1, +1) + height, angle + 0.35 + Random (-0.2, +0.2) + wind);
00070 DrawTree (x1, y1, length - 10 , angle - 0.35 - Random (-0.2, +0.2) + wind);
00071 }
00072
00073
00074
00075 inline double Random (double min, double max)
00076 {
00077 return min + (max - min) * rand() / RAND_MAX;
00078 }
1.7.3