1 | /* shadebobs, Copyright (c) 1999 Shane Smit <blackend@inconnect.com> |
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2 | * |
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3 | * Permission to use, copy, modify, distribute, and sell this software and its |
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4 | * documentation for any purpose is hereby granted without fee, provided that |
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5 | * the above copyright notice appear in all copies and that both that |
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6 | * copyright notice and this permission notice appear in supporting |
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7 | * documentation. No representations are made about the suitability of this |
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8 | * software for any purpose. It is provided "as is" without express or |
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9 | * implied warranty. |
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10 | * |
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11 | * Module - "shadebobs.c" |
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12 | * |
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13 | * Description: |
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14 | * There are two little shading circles (bobs) that zip around the screen. |
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15 | * one of them shades up towards white, and the other shades down toward |
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16 | * black. |
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17 | * This keeps the screen in color balance at a chosen color. |
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18 | * |
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19 | * Its kinda like 'The Force' |
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20 | * There is a light side, a dark side, and it keeps the world in balance. |
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21 | * |
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22 | * [05/23/99] - Shane Smit: Creation |
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23 | * [05/26/99] - Shane Smit: Port to C/screenhack for use with XScreenSaver |
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24 | * [06/11/99] - Shane Smit: Stopped trying to rape the palette. |
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25 | * [06/20/99] - jwz: cleaned up ximage handling, gave resoources short names, |
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26 | * introduced delay, made it restart after N iterations. |
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27 | * [06/21/99] - Shane Smit: Modified default values slightly, color changes |
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28 | * on cycle, and the extents of the sinus pattern change in |
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29 | * real-time. |
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30 | * [06/22/99] - Shane Smit: Fixed delay to be fast and use little CPU :). |
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31 | * [09/17/99] - Shane Smit: Made all calculations based on the size of the |
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32 | * window. Thus, it'll look the same at 100x100 as it does at |
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33 | * 1600x1200 ( Only smaller :). |
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34 | * [04/24/00] - Shane Smit: Revamped entire source code: |
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35 | * Shade Bob movement is calculated very differently. |
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36 | * Base color can be any color now. |
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37 | */ |
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38 | |
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39 | #include <math.h> |
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40 | #include "screenhack.h" |
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41 | #include <X11/Xutil.h> |
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42 | |
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43 | /* #define VERBOSE */ |
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44 | |
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45 | char *progclass = "ShadeBobs"; |
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46 | |
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47 | char *defaults [] = { |
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48 | ".background: black", |
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49 | ".foreground: white", |
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50 | "*degrees: 0", /* default: Automatic degree calculation */ |
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51 | "*color: random", |
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52 | "*count: 4", |
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53 | "*cycles: 10", |
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54 | "*ncolors: 64", /* changing this doesn't work particularly well */ |
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55 | "*delay: 5000", |
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56 | 0 |
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57 | }; |
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58 | |
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59 | XrmOptionDescRec options [] = { |
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60 | { "-degrees", ".degrees", XrmoptionSepArg, 0 }, |
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61 | { "-color", ".color", XrmoptionSepArg, 0 }, |
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62 | { "-ncolors", ".ncolors", XrmoptionSepArg, 0 }, |
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63 | { "-count", ".count", XrmoptionSepArg, 0 }, |
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64 | { "-delay", ".delay", XrmoptionSepArg, 0 }, |
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65 | { "-cycles", ".cycles", XrmoptionSepArg, 0 }, |
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66 | { 0, 0, 0, 0 } |
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67 | }; |
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68 | |
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69 | static unsigned short iDegreeCount; |
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70 | static double *anSinTable, *anCosTable; |
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71 | static unsigned short iWinWidth, iWinHeight; |
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72 | static unsigned short iWinCenterX, iWinCenterY; |
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73 | static char *sColor; |
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74 | static unsigned char iBobRadius, iBobDiameter; |
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75 | static unsigned char iVelocity; |
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76 | |
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77 | #define RANDOM() ((int) (random() & 0X7FFFFFFFL)) |
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78 | |
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79 | |
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80 | /* Ahem. Chocolate is a flavor; not a food. Thank you */ |
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81 | |
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82 | |
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83 | typedef struct |
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84 | { |
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85 | signed char *anDeltaMap; |
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86 | double nAngle, nAngleDelta, nAngleInc; |
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87 | double nPosX, nPosY; |
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88 | } SShadeBob; |
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89 | |
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90 | |
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91 | static void ResetShadeBob( SShadeBob *pShadeBob ) |
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92 | { |
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93 | pShadeBob->nPosX = RANDOM() % iWinWidth; |
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94 | pShadeBob->nPosY = RANDOM() % iWinHeight; |
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95 | pShadeBob->nAngle = RANDOM() % iDegreeCount; |
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96 | pShadeBob->nAngleDelta = ( RANDOM() % iDegreeCount ) - ( iDegreeCount / 2.0F ); |
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97 | pShadeBob->nAngleInc = pShadeBob->nAngleDelta / 50.0F; |
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98 | if( pShadeBob->nAngleInc == 0.0F ) |
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99 | pShadeBob->nAngleInc = ( pShadeBob->nAngleDelta > 0.0F ) ? 0.0001F : -0.0001F; |
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100 | } |
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101 | |
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102 | |
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103 | static void InitShadeBob( SShadeBob *pShadeBob, Bool bDark ) |
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104 | { |
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105 | double nDelta; |
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106 | int iWidth, iHeight; |
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107 | |
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108 | if( ( pShadeBob->anDeltaMap = calloc( iBobDiameter * iBobDiameter, sizeof(char) ) ) == NULL ) |
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109 | { |
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110 | fprintf( stderr, "%s: Could not allocate Delta Map!\n", progclass ); |
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111 | return; |
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112 | } |
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113 | |
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114 | for( iHeight=-iBobRadius; iHeight<iBobRadius; iHeight++ ) |
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115 | for( iWidth=-iBobRadius; iWidth<iBobRadius; iWidth++ ) |
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116 | { |
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117 | nDelta = 9 - ( ( sqrt( pow( iWidth+0.5, 2 ) + pow( iHeight+0.5, 2 ) ) / iBobRadius ) * 8 ); |
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118 | if( nDelta < 0 ) nDelta = 0; |
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119 | if( bDark ) nDelta = -nDelta; |
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120 | pShadeBob->anDeltaMap[ ( iWidth + iBobRadius ) * iBobDiameter + iHeight + iBobRadius ] = (char)nDelta; |
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121 | } |
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122 | |
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123 | ResetShadeBob( pShadeBob ); |
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124 | } |
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125 | |
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126 | |
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127 | /* A delta is calculated, and the shadebob turns at an increment. When the delta |
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128 | * falls to 0, a new delta and increment are calculated. */ |
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129 | static void MoveShadeBob( SShadeBob *pShadeBob ) |
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130 | { |
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131 | pShadeBob->nAngle += pShadeBob->nAngleInc; |
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132 | pShadeBob->nAngleDelta -= pShadeBob->nAngleInc; |
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133 | |
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134 | if( pShadeBob->nAngle >= iDegreeCount ) pShadeBob->nAngle -= iDegreeCount; |
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135 | else if( pShadeBob->nAngle < 0 ) pShadeBob->nAngle += iDegreeCount; |
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136 | |
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137 | if( ( pShadeBob->nAngleInc>0.0F && pShadeBob->nAngleDelta<pShadeBob->nAngleInc ) || |
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138 | ( pShadeBob->nAngleInc<=0.0F && pShadeBob->nAngleDelta>pShadeBob->nAngleInc ) ) |
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139 | { |
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140 | pShadeBob->nAngleDelta = ( RANDOM() % iDegreeCount ) - ( iDegreeCount / 2.0F ); |
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141 | pShadeBob->nAngleInc = pShadeBob->nAngleDelta / 50.0F; |
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142 | if( pShadeBob->nAngleInc == 0.0F ) |
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143 | pShadeBob->nAngleInc = ( pShadeBob->nAngleDelta > 0.0F ) ? 0.0001F : -0.0001F; |
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144 | } |
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145 | |
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146 | pShadeBob->nPosX = ( anSinTable[ (int)pShadeBob->nAngle ] * iVelocity ) + pShadeBob->nPosX; |
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147 | pShadeBob->nPosY = ( anCosTable[ (int)pShadeBob->nAngle ] * iVelocity ) + pShadeBob->nPosY; |
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148 | |
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149 | /* This wraps it around the screen. */ |
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150 | if( pShadeBob->nPosX >= iWinWidth ) pShadeBob->nPosX -= iWinWidth; |
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151 | else if( pShadeBob->nPosX < 0 ) pShadeBob->nPosX += iWinWidth; |
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152 | |
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153 | if( pShadeBob->nPosY >= iWinHeight ) pShadeBob->nPosY -= iWinHeight; |
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154 | else if( pShadeBob->nPosY < 0 ) pShadeBob->nPosY += iWinHeight; |
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155 | } |
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156 | |
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157 | |
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158 | static void Execute( SShadeBob *pShadeBob, Display *pDisplay, |
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159 | Window MainWindow, |
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160 | GC *pGC, XImage *pImage, |
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161 | signed short iColorCount, unsigned long *aiColorVals ) |
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162 | { |
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163 | unsigned long iColor; |
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164 | short iColorVal; |
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165 | int iPixelX, iPixelY; |
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166 | unsigned int iWidth, iHeight; |
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167 | |
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168 | MoveShadeBob( pShadeBob ); |
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169 | |
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170 | for( iHeight=0; iHeight<iBobDiameter; iHeight++ ) |
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171 | { |
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172 | iPixelY = pShadeBob->nPosY + iHeight; |
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173 | if( iPixelY >= iWinHeight ) iPixelY -= iWinHeight; |
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174 | |
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175 | for( iWidth=0; iWidth<iBobDiameter; iWidth++ ) |
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176 | { |
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177 | iPixelX = pShadeBob->nPosX + iWidth; |
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178 | if( iPixelX >= iWinWidth ) iPixelX -= iWinWidth; |
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179 | |
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180 | iColor = XGetPixel( pImage, iPixelX, iPixelY ); |
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181 | |
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182 | /* FIXME: Here is a loop I'd love to take out. */ |
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183 | for( iColorVal=0; iColorVal<iColorCount; iColorVal++ ) |
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184 | if( aiColorVals[ iColorVal ] == iColor ) |
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185 | break; |
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186 | |
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187 | iColorVal += pShadeBob->anDeltaMap[ iWidth * iBobDiameter + iHeight ]; |
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188 | if( iColorVal >= iColorCount ) iColorVal = iColorCount - 1; |
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189 | if( iColorVal < 0 ) iColorVal = 0; |
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190 | |
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191 | XPutPixel( pImage, iPixelX, iPixelY, aiColorVals[ iColorVal ] ); |
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192 | } |
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193 | } |
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194 | |
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195 | /* FIXME: if it's next to the top or left sides of screen this will break. However, it's not noticable. */ |
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196 | XPutImage( pDisplay, MainWindow, *pGC, pImage, |
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197 | pShadeBob->nPosX, pShadeBob->nPosY, pShadeBob->nPosX, pShadeBob->nPosY, iBobDiameter, iBobDiameter ); |
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198 | XSync( pDisplay, False ); |
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199 | } |
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200 | |
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201 | |
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202 | static void CreateTables( unsigned int nDegrees ) |
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203 | { |
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204 | double nRadian; |
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205 | unsigned int iDegree; |
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206 | anSinTable = calloc( nDegrees, sizeof(double) ); |
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207 | anCosTable = calloc( nDegrees, sizeof(double) ); |
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208 | |
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209 | for( iDegree=0; iDegree<nDegrees; iDegree++ ) |
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210 | { |
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211 | nRadian = ( (double)(2*iDegree) / (double)nDegrees ) * M_PI; |
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212 | anSinTable[ iDegree ] = sin( nRadian ); |
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213 | anCosTable[ iDegree ] = cos( nRadian ); |
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214 | } |
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215 | } |
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216 | |
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217 | |
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218 | static unsigned long * SetPalette(Display *pDisplay, Window Win, char *sColor, signed short *piColorCount ) |
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219 | { |
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220 | XWindowAttributes XWinAttribs; |
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221 | XColor Color, *aColors; |
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222 | unsigned long *aiColorVals; |
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223 | signed short iColor; |
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224 | float nHalfColors; |
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225 | |
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226 | XGetWindowAttributes( pDisplay, Win, &XWinAttribs ); |
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227 | |
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228 | Color.red = RANDOM() % 0xFFFF; |
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229 | Color.green = RANDOM() % 0xFFFF; |
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230 | Color.blue = RANDOM() % 0xFFFF; |
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231 | |
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232 | if( strcasecmp( sColor, "random" ) && !XParseColor( pDisplay, XWinAttribs.colormap, sColor, &Color ) ) |
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233 | fprintf( stderr, "%s: color %s not found in database. Choosing to random...\n", progname, sColor ); |
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234 | |
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235 | #ifdef VERBOSE |
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236 | printf( "%s: Base color (RGB): <%d, %d, %d>\n", progclass, Color.red, Color.green, Color.blue ); |
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237 | #endif /* VERBOSE */ |
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238 | |
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239 | *piColorCount = get_integer_resource( "ncolors", "Integer" ); |
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240 | if( *piColorCount < 2 ) *piColorCount = 2; |
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241 | if( *piColorCount > 255 ) *piColorCount = 255; |
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242 | |
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243 | aColors = calloc( *piColorCount, sizeof(XColor) ); |
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244 | aiColorVals = calloc( *piColorCount, sizeof(unsigned long) ); |
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245 | |
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246 | for( iColor=0; iColor<*piColorCount; iColor++ ) |
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247 | { |
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248 | nHalfColors = *piColorCount / 2.0F; |
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249 | /* Black -> Base Color */ |
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250 | if( iColor < (*piColorCount/2) ) |
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251 | { |
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252 | aColors[ iColor ].red = ( Color.red / nHalfColors ) * iColor; |
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253 | aColors[ iColor ].green = ( Color.green / nHalfColors ) * iColor; |
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254 | aColors[ iColor ].blue = ( Color.blue / nHalfColors ) * iColor; |
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255 | } |
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256 | /* Base Color -> White */ |
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257 | else |
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258 | { |
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259 | aColors[ iColor ].red = ( ( ( 0xFFFF - Color.red ) / nHalfColors ) * ( iColor - nHalfColors ) ) + Color.red; |
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260 | aColors[ iColor ].green = ( ( ( 0xFFFF - Color.green ) / nHalfColors ) * ( iColor - nHalfColors ) ) + Color.green; |
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261 | aColors[ iColor ].blue = ( ( ( 0xFFFF - Color.blue ) / nHalfColors ) * ( iColor - nHalfColors ) ) + Color.blue; |
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262 | } |
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263 | |
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264 | if( !XAllocColor( pDisplay, XWinAttribs.colormap, &aColors[ iColor ] ) ) |
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265 | { |
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266 | /* start all over with less colors */ |
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267 | XFreeColors( pDisplay, XWinAttribs.colormap, aiColorVals, iColor, 0 ); |
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268 | free( aColors ); |
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269 | free( aiColorVals ); |
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270 | piColorCount--; |
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271 | aColors = calloc( *piColorCount, sizeof(XColor) ); |
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272 | aiColorVals = calloc( *piColorCount, sizeof(unsigned long) ); |
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273 | iColor = -1; |
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274 | } |
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275 | else |
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276 | aiColorVals[ iColor ] = aColors[ iColor ].pixel; |
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277 | } |
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278 | |
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279 | free( aColors ); |
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280 | |
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281 | XSetWindowBackground( pDisplay, Win, aiColorVals[ 0 ] ); |
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282 | |
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283 | return aiColorVals; |
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284 | } |
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285 | |
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286 | |
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287 | static void Initialize( Display *pDisplay, Window Win, GC *pGC, XImage **ppImage ) |
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288 | { |
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289 | XGCValues gcValues; |
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290 | XWindowAttributes XWinAttribs; |
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291 | int iBitsPerPixel; |
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292 | |
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293 | /* Create the Image for drawing */ |
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294 | XGetWindowAttributes( pDisplay, Win, &XWinAttribs ); |
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295 | |
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296 | /* Find the preferred bits-per-pixel. (jwz) */ |
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297 | { |
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298 | int i, pfvc = 0; |
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299 | XPixmapFormatValues *pfv = XListPixmapFormats( pDisplay, &pfvc ); |
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300 | for( i=0; i<pfvc; i++ ) |
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301 | if( pfv[ i ].depth == XWinAttribs.depth ) |
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302 | { |
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303 | iBitsPerPixel = pfv[ i ].bits_per_pixel; |
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304 | break; |
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305 | } |
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306 | if( pfv ) |
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307 | XFree (pfv); |
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308 | } |
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309 | |
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310 | /* Create the GC. */ |
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311 | *pGC = XCreateGC( pDisplay, Win, 0, &gcValues ); |
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312 | |
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313 | *ppImage = XCreateImage( pDisplay, XWinAttribs.visual, XWinAttribs.depth, ZPixmap, 0, NULL, |
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314 | XWinAttribs.width, XWinAttribs.height, BitmapPad( pDisplay ), 0 ); |
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315 | (*ppImage)->data = calloc((*ppImage)->bytes_per_line, (*ppImage)->height); |
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316 | |
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317 | iWinWidth = XWinAttribs.width; |
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318 | iWinHeight = XWinAttribs.height; |
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319 | |
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320 | /* These are precalculations used in Execute(). */ |
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321 | iBobDiameter = ( ( iWinWidth < iWinHeight ) ? iWinWidth : iWinHeight ) / 25; |
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322 | iBobRadius = iBobDiameter / 2; |
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323 | #ifdef VERBOSE |
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324 | printf( "%s: Bob Diameter = %d\n", progclass, iBobDiameter ); |
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325 | #endif |
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326 | |
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327 | iWinCenterX = ( XWinAttribs.width / 2 ) - iBobRadius; |
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328 | iWinCenterY = ( XWinAttribs.height / 2 ) - iBobRadius; |
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329 | |
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330 | iVelocity = ( ( iWinWidth < iWinHeight ) ? iWinWidth : iWinHeight ) / 150; |
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331 | |
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332 | /* Create the Sin and Cosine lookup tables. */ |
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333 | iDegreeCount = get_integer_resource( "degrees", "Integer" ); |
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334 | if( iDegreeCount == 0 ) iDegreeCount = ( XWinAttribs.width / 6 ) + 400; |
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335 | else if( iDegreeCount < 90 ) iDegreeCount = 90; |
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336 | else if( iDegreeCount > 5400 ) iDegreeCount = 5400; |
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337 | CreateTables( iDegreeCount ); |
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338 | #ifdef VERBOSE |
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339 | printf( "%s: Using a %d degree circle.\n", progclass ); |
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340 | #endif /* VERBOSE */ |
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341 | |
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342 | /* Get the base color. */ |
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343 | sColor = get_string_resource( "color", "Color" ); |
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344 | } |
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345 | |
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346 | |
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347 | void screenhack(Display *pDisplay, Window Win ) |
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348 | { |
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349 | GC gc; |
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350 | signed short iColorCount = 0; |
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351 | unsigned long *aiColorVals = NULL; |
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352 | XImage *pImage = NULL; |
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353 | unsigned char nShadeBobCount, iShadeBob; |
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354 | SShadeBob *aShadeBobs; |
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355 | #ifdef VERBOSE |
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356 | time_t nTime = time( NULL ); |
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357 | unsigned short iFrame = 0; |
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358 | #endif /* VERBOSE */ |
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359 | int delay, cycles, i; |
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360 | |
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361 | nShadeBobCount = get_integer_resource( "count", "Integer" ); |
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362 | if( nShadeBobCount > 64 ) nShadeBobCount = 64; |
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363 | if( nShadeBobCount < 1 ) nShadeBobCount = 1; |
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364 | |
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365 | if( ( aShadeBobs = calloc( nShadeBobCount, sizeof(SShadeBob) ) ) == NULL ) |
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366 | { |
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367 | fprintf( stderr, "%s: Could not allocate %d ShadeBobs\n", progclass, nShadeBobCount ); |
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368 | return; |
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369 | } |
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370 | #ifdef VERBOSE |
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371 | printf( "%s: Allocated %d ShadeBobs\n", progclass, nShadeBobCount ); |
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372 | #endif /* VERBOSE */ |
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373 | |
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374 | Initialize( pDisplay, Win, &gc, &pImage ); |
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375 | |
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376 | for( iShadeBob=0; iShadeBob<nShadeBobCount; iShadeBob++ ) |
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377 | InitShadeBob( &aShadeBobs[ iShadeBob ], iShadeBob % 2 ); |
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378 | |
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379 | delay = get_integer_resource( "delay", "Integer" ); |
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380 | cycles = get_integer_resource( "cycles", "Integer" ) * iDegreeCount; |
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381 | i = cycles; |
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382 | |
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383 | while( 1 ) |
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384 | { |
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385 | screenhack_handle_events( pDisplay ); |
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386 | |
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387 | if( i++ >= cycles ) |
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388 | { |
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389 | XWindowAttributes XWinAttribs; |
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390 | XGetWindowAttributes( pDisplay, Win, &XWinAttribs ); |
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391 | |
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392 | i = 0; |
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393 | memset( pImage->data, 0, pImage->bytes_per_line * pImage->height ); |
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394 | for( iShadeBob=0; iShadeBob<nShadeBobCount; iShadeBob++ ) |
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395 | ResetShadeBob( &aShadeBobs[ iShadeBob ] ); |
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396 | XFreeColors( pDisplay, XWinAttribs.colormap, aiColorVals, iColorCount, 0 ); |
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397 | free( aiColorVals ); |
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398 | aiColorVals = SetPalette( pDisplay, Win, sColor, &iColorCount ); |
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399 | XClearWindow( pDisplay, Win ); |
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400 | } |
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401 | |
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402 | for( iShadeBob=0; iShadeBob<nShadeBobCount; iShadeBob++ ) |
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403 | Execute( &aShadeBobs[ iShadeBob ], pDisplay, Win, &gc, pImage, iColorCount, aiColorVals ); |
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404 | |
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405 | if( delay && !(i % 4) ) |
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406 | usleep(delay); |
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407 | |
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408 | #ifdef VERBOSE |
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409 | iFrame++; |
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410 | if( nTime - time( NULL ) ) |
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411 | { |
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412 | printf( "%s: %d FPS\n", progclass, iFrame ); |
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413 | nTime = time( NULL ); |
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414 | iFrame = 0; |
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415 | } |
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416 | #endif /* VERBOSE */ |
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417 | } |
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418 | |
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419 | free( anSinTable ); |
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420 | free( anCosTable ); |
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421 | free( pImage->data ); |
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422 | XDestroyImage( pImage ); |
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423 | for( iShadeBob=0; iShadeBob<nShadeBobCount; iShadeBob++ ) |
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424 | free( aShadeBobs[ iShadeBob ].anDeltaMap ); |
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425 | free( aShadeBobs ); |
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426 | free( aiColorVals ); |
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427 | } |
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428 | |
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429 | |
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430 | /* End of Module - "shadebobs.c" */ |
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431 | |
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432 | /* vim: ts=4 |
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433 | */ |
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