00001
00008
00009
00010
00011 #include "TXLib.h"
00012
00013 #if !defined (_TX_VER) || (_TX_VER < 0x172a0000)
00014 #error Must use TXLib.h version >= 1.72 to compile this. -- Ded
00015 #endif
00016
00017
00018
00019 double Random (double min, double max);
00020 POINT TxGetWindowOrg();
00021
00022 unsigned long Time = 0;
00023
00024 POINT WindowSize = {0};
00025
00026
00027
00028 struct Ball_t
00029 {
00030 double x_;
00031 double y_;
00032 double vx_;
00033 double vy_;
00034 double r_;
00035 COLORREF color_;
00036
00037 Ball_t();
00038
00039 void draw (bool shading) const;
00040 void move (const POINT& d);
00041 };
00042
00043
00044
00045 Ball_t::Ball_t() :
00046 x_ (Random (100, WindowSize.x - 100)),
00047 y_ (Random (100, WindowSize.y - 100)),
00048 vx_ (Random ( 5, 15)),
00049 vy_ (Random ( 5, 15)),
00050 r_ (Random ( 10, 30)),
00051 color_ (RGB (Random (50, 255), Random (50, 255), Random (50, 255)))
00052 {}
00053
00054
00055
00056 void Ball_t::draw (bool shading) const
00057 {
00058 if (shading)
00059 {
00060 double r = txExtractColor (color_, TX_RED) / 255.0,
00061 g = txExtractColor (color_, TX_GREEN) / 255.0,
00062 b = txExtractColor (color_, TX_BLUE) / 255.0;
00063
00064 for (double t = 0; t <= 1; t += 1.0/10)
00065 {
00066 double c = pow (t + 0.05, 0.25);
00067 txColor (r*c, g*c, b*c);
00068 txFillColor (r*c, g*c, b*c);
00069 txCircle (x_, y_, r_ * (1-t) + 0.5);
00070
00071 if (GetTickCount() > Time) break;
00072 }
00073 }
00074 else
00075 {
00076 txSetColor (color_);
00077 txSetFillColor (color_);
00078 txCircle (x_, y_, r_);
00079 }
00080 }
00081
00082
00083
00084 #define AY ( 0.7 )
00085 #define DT ( 1.0 )
00086 #define ELASTICITY ( 0.6 + Random (-0.2, +0.1) )
00087
00088 void Ball_t::move (const POINT& d)
00089 {
00090 x_ -= d.x;
00091 y_ -= d.y;
00092
00093 y_ += vy_ * DT;
00094 x_ += vx_ * DT;
00095
00096 vy_ += AY;
00097
00098 if (x_ < 0 + r_) { x_ = 0 + r_; vx_ = -vx_ * ELASTICITY + d.x; }
00099 if (y_ < 0 + r_) { y_ = 0 + r_; vy_ = -vy_ * ELASTICITY + d.y; }
00100 if (x_ > WindowSize.x - r_) { x_ = WindowSize.x - r_; vx_ = -vx_ * ELASTICITY + d.x; }
00101 if (y_ > WindowSize.y - r_) { y_ = WindowSize.y - r_; vy_ = -vy_ * ELASTICITY + d.y; }
00102 }
00103
00104
00105
00106 POINT TxGetWindowOrg()
00107 {
00108 RECT r = {0, 0, 0, 0};
00109 GetWindowRect (txWindow(), &r);
00110 POINT org = { r.left, r.top };
00111 return org;
00112 }
00113
00114 inline double Random (double min, double max)
00115 {
00116 return min + (max - min) * rand() / RAND_MAX;
00117 }
00118
00119
00120
00121 #define SLEEP_TIME 20
00122
00123 int main()
00124 {
00125 srand ((unsigned) time (NULL));
00126
00127 txCreateWindow (700, 500);
00128
00129 WindowSize = txGetExtent();
00130 POINT org1 = TxGetWindowOrg();
00131
00132 Ball_t balls[20];
00133
00134 txBegin();
00135
00136 while (!GetAsyncKeyState (VK_ESCAPE))
00137 {
00138 Time = GetTickCount() + SLEEP_TIME;
00139
00140 txSetFillColor (TX_BLACK);
00141 if (!GetAsyncKeyState (VK_CONTROL)) txClear();
00142
00143 txDrawText (0, WindowSize.y * 4/10, WindowSize.x, WindowSize.y * 6/10,
00144 "Move window, shake the balls.\n" "[Ctrl] paints, [Esc] exits");
00145
00146 POINT org0 = org1; org1 = TxGetWindowOrg();
00147 POINT d = { org1.x - org0.x, org1.y - org0.y };
00148
00149 for (unsigned i = 0; i < SIZEARR (balls); i++) balls[i].move (d);
00150 for (unsigned i = 0; i < SIZEARR (balls); i++) balls[i].draw (true);
00151
00152 txSleep (0);
00153
00154 char s[100] = ""; sprintf (s, "+%03lu ms free", Time - GetTickCount());
00155 SetWindowText (txWindow(), s);
00156
00157 while (GetTickCount() < Time) Sleep (0);
00158 }
00159
00160 txEnd();
00161
00162 _txExit = true;
00163 return 0;
00164 }
1.7.3