Mercurial > sdl-ios-xcode
annotate docs/html/time.html @ 3958:85b6fb6a5e3c SDL-1.2
Actually, this is a better fix...clear the error state once if everything we
need loaded; it's more efficient, and works even if the last unnecessary
xrandr symbol failed to load. Otherwise, leave the original loadso error, so
the end user can find out what symbol failed.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Wed, 13 Jun 2007 08:00:10 +0000 |
| parents | 355632dca928 |
| children |
| rev | line source |
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| 0 | 1 <HTML |
| 2 ><HEAD | |
| 3 ><TITLE | |
| 4 >Time</TITLE | |
| 5 ><META | |
| 6 NAME="GENERATOR" | |
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+ |
| 0 | 8 "><LINK |
| 9 REL="HOME" | |
| 10 TITLE="SDL Library Documentation" | |
| 11 HREF="index.html"><LINK | |
| 12 REL="UP" | |
| 13 TITLE="SDL Reference" | |
| 14 HREF="reference.html"><LINK | |
| 15 REL="PREVIOUS" | |
| 16 TITLE="SDL_CondWaitTimeout" | |
| 17 HREF="sdlcondwaittimeout.html"><LINK | |
| 18 REL="NEXT" | |
| 19 TITLE="SDL_GetTicks" | |
| 20 HREF="sdlgetticks.html"><META | |
| 21 NAME="KEYWORD" | |
| 22 CONTENT="time"><META | |
| 23 NAME="KEYWORD" | |
| 24 CONTENT="function"></HEAD | |
| 25 ><BODY | |
| 26 CLASS="CHAPTER" | |
| 27 BGCOLOR="#FFF8DC" | |
| 28 TEXT="#000000" | |
| 29 LINK="#0000ee" | |
| 30 VLINK="#551a8b" | |
| 31 ALINK="#ff0000" | |
| 32 ><DIV | |
| 33 CLASS="NAVHEADER" | |
| 34 ><TABLE | |
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35 SUMMARY="Header navigation table" |
| 0 | 36 WIDTH="100%" |
| 37 BORDER="0" | |
| 38 CELLPADDING="0" | |
| 39 CELLSPACING="0" | |
| 40 ><TR | |
| 41 ><TH | |
| 42 COLSPAN="3" | |
| 43 ALIGN="center" | |
| 44 >SDL Library Documentation</TH | |
| 45 ></TR | |
| 46 ><TR | |
| 47 ><TD | |
| 48 WIDTH="10%" | |
| 49 ALIGN="left" | |
| 50 VALIGN="bottom" | |
| 51 ><A | |
| 52 HREF="sdlcondwaittimeout.html" | |
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53 ACCESSKEY="P" |
| 0 | 54 >Prev</A |
| 55 ></TD | |
| 56 ><TD | |
| 57 WIDTH="80%" | |
| 58 ALIGN="center" | |
| 59 VALIGN="bottom" | |
| 60 ></TD | |
| 61 ><TD | |
| 62 WIDTH="10%" | |
| 63 ALIGN="right" | |
| 64 VALIGN="bottom" | |
| 65 ><A | |
| 66 HREF="sdlgetticks.html" | |
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67 ACCESSKEY="N" |
| 0 | 68 >Next</A |
| 69 ></TD | |
| 70 ></TR | |
| 71 ></TABLE | |
| 72 ><HR | |
| 73 ALIGN="LEFT" | |
| 74 WIDTH="100%"></DIV | |
| 75 ><DIV | |
| 76 CLASS="CHAPTER" | |
| 77 ><H1 | |
| 78 ><A | |
| 79 NAME="TIME" | |
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80 ></A |
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81 >Chapter 13. Time</H1 |
| 0 | 82 ><DIV |
| 83 CLASS="TOC" | |
| 84 ><DL | |
| 85 ><DT | |
| 86 ><B | |
| 87 >Table of Contents</B | |
| 88 ></DT | |
| 89 ><DT | |
| 90 ><A | |
| 91 HREF="sdlgetticks.html" | |
| 92 >SDL_GetTicks</A | |
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93 > -- Get the number of milliseconds since the SDL library initialization.</DT |
| 0 | 94 ><DT |
| 95 ><A | |
| 96 HREF="sdldelay.html" | |
| 97 >SDL_Delay</A | |
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98 > -- Wait a specified number of milliseconds before returning.</DT |
| 0 | 99 ><DT |
| 100 ><A | |
| 101 HREF="sdladdtimer.html" | |
| 102 >SDL_AddTimer</A | |
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103 > -- Add a timer which will call a callback after the specified number of milliseconds has |
| 0 | 104 elapsed.</DT |
| 105 ><DT | |
| 106 ><A | |
| 107 HREF="sdlremovetimer.html" | |
| 108 >SDL_RemoveTimer</A | |
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109 > -- Remove a timer which was added with |
| 0 | 110 <A |
| 111 HREF="sdladdtimer.html" | |
| 112 >SDL_AddTimer</A | |
| 113 >.</DT | |
| 114 ><DT | |
| 115 ><A | |
| 116 HREF="sdlsettimer.html" | |
| 117 >SDL_SetTimer</A | |
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118 > -- Set a callback to run after the specified number of milliseconds has |
| 0 | 119 elapsed.</DT |
| 120 ></DL | |
| 121 ></DIV | |
| 122 ><P | |
| 123 >SDL provides several cross-platform functions for dealing with time. | |
| 124 It provides a way to get the current time, a way to wait a little while, | |
| 125 and a simple timer mechanism. These functions give you two ways of moving an | |
| 126 object every x milliseconds: | |
| 127 | |
| 128 <P | |
| 129 ></P | |
| 130 ><UL | |
| 131 ><LI | |
| 132 ><P | |
| 133 >Use a timer callback function. This may have the bad effect that it runs in a seperate thread or uses alarm signals, but it's easier to implement.</P | |
| 134 ></LI | |
| 135 ><LI | |
| 136 ><P | |
| 137 >Or you can get the number of milliseconds passed, and move the object if, for example, 30 ms passed.</P | |
| 138 ></LI | |
| 139 ></UL | |
| 140 > </P | |
| 141 ></DIV | |
| 142 ><DIV | |
| 143 CLASS="NAVFOOTER" | |
| 144 ><HR | |
| 145 ALIGN="LEFT" | |
| 146 WIDTH="100%"><TABLE | |
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147 SUMMARY="Footer navigation table" |
| 0 | 148 WIDTH="100%" |
| 149 BORDER="0" | |
| 150 CELLPADDING="0" | |
| 151 CELLSPACING="0" | |
| 152 ><TR | |
| 153 ><TD | |
| 154 WIDTH="33%" | |
| 155 ALIGN="left" | |
| 156 VALIGN="top" | |
| 157 ><A | |
| 158 HREF="sdlcondwaittimeout.html" | |
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159 ACCESSKEY="P" |
| 0 | 160 >Prev</A |
| 161 ></TD | |
| 162 ><TD | |
| 163 WIDTH="34%" | |
| 164 ALIGN="center" | |
| 165 VALIGN="top" | |
| 166 ><A | |
| 167 HREF="index.html" | |
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168 ACCESSKEY="H" |
| 0 | 169 >Home</A |
| 170 ></TD | |
| 171 ><TD | |
| 172 WIDTH="33%" | |
| 173 ALIGN="right" | |
| 174 VALIGN="top" | |
| 175 ><A | |
| 176 HREF="sdlgetticks.html" | |
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177 ACCESSKEY="N" |
| 0 | 178 >Next</A |
| 179 ></TD | |
| 180 ></TR | |
| 181 ><TR | |
| 182 ><TD | |
| 183 WIDTH="33%" | |
| 184 ALIGN="left" | |
| 185 VALIGN="top" | |
| 186 >SDL_CondWaitTimeout</TD | |
| 187 ><TD | |
| 188 WIDTH="34%" | |
| 189 ALIGN="center" | |
| 190 VALIGN="top" | |
| 191 ><A | |
| 192 HREF="reference.html" | |
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parents:
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193 ACCESSKEY="U" |
| 0 | 194 >Up</A |
| 195 ></TD | |
| 196 ><TD | |
| 197 WIDTH="33%" | |
| 198 ALIGN="right" | |
| 199 VALIGN="top" | |
| 200 >SDL_GetTicks</TD | |
| 201 ></TR | |
| 202 ></TABLE | |
| 203 ></DIV | |
| 204 ></BODY | |
| 205 ></HTML | |
| 206 > |