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[SDL] Bad math in SDL_RenderCopy Mason Wheeler to sdl When I tried to render an image using something other than NULL for srcrect, it got horribly distorted. I traced it down to the fact that the math in the rectangle adjustments performed just before the call to renderer->RenderCopy is written inside out. It should look like this: if (dstrect->w != real_dstrect.w) { int deltax = (dstrect->x - real_dstrect.x); int deltaw = (dstrect->w - real_dstrect.w); real_srcrect.x += (deltax * real_srcrect.w) / dstrect->w; real_srcrect.w += (deltaw * real_srcrect.w) / dstrect->w; } if (dstrect->h != real_dstrect.h) { int deltay = (dstrect->y - real_dstrect.y); int deltah = (dstrect->h - real_dstrect.h); real_srcrect.y += (deltay * real_srcrect.h) / dstrect->h; real_srcrect.h += (deltah * real_srcrect.h) / dstrect->h;
author Sam Lantinga <slouken@libsdl.org>
date Sat, 03 Oct 2009 16:23:16 +0000
parents 355632dca928
children
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<HTML
><HEAD
><TITLE
>SDL_JoystickGetButton</TITLE
><META
NAME="GENERATOR"
CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
"><LINK
REL="HOME"
TITLE="SDL Library Documentation"
HREF="index.html"><LINK
REL="UP"
TITLE="Joystick"
HREF="joystick.html"><LINK
REL="PREVIOUS"
TITLE="SDL_JoystickGetHat"
HREF="sdljoystickgethat.html"><LINK
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TITLE="SDL_JoystickGetBall"
HREF="sdljoystickgetball.html"></HEAD
><BODY
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BGCOLOR="#FFF8DC"
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>SDL Library Documentation</TH
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><HR
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><H1
><A
NAME="SDLJOYSTICKGETBUTTON"
></A
>SDL_JoystickGetButton</H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN6404"
></A
><H2
>Name</H2
>SDL_JoystickGetButton&nbsp;--&nbsp;Get the current state of a given button on a given joystick</DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN6407"
></A
><H2
>Synopsis</H2
><DIV
CLASS="FUNCSYNOPSIS"
><A
NAME="AEN6408"
></A
><P
></P
><PRE
CLASS="FUNCSYNOPSISINFO"
>#include "SDL.h"</PRE
><P
><CODE
><CODE
CLASS="FUNCDEF"
>Uint8 <B
CLASS="FSFUNC"
>SDL_JoystickGetButton</B
></CODE
>(SDL_Joystick *joystick, int button);</CODE
></P
><P
></P
></DIV
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN6414"
></A
><H2
>Description</H2
><P
>SDL_JoystickGetButton returns the current state of the given <TT
CLASS="PARAMETER"
><I
>button</I
></TT
> on the given <TT
CLASS="PARAMETER"
><I
>joystick</I
></TT
>.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN6419"
></A
><H2
>Return Value</H2
><P
><SPAN
CLASS="RETURNVALUE"
>1</SPAN
> if the button is pressed. Otherwise, <SPAN
CLASS="RETURNVALUE"
>0</SPAN
>.</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN6424"
></A
><H2
>See Also</H2
><P
><A
HREF="sdljoysticknumbuttons.html"
><TT
CLASS="FUNCTION"
>SDL_JoystickNumButtons</TT
></A
></P
></DIV
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>Prev</A
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>SDL_JoystickGetHat</TD
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>Up</A
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>