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Add option to invert the Mouse Y coordinate on MacOS

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This commit is contained in:
Carlos Aragones 2021-11-16 09:55:27 +01:00
parent 44cdecae60
commit 11151ca6f0
3 changed files with 24 additions and 1 deletions
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5
CMakeLists.txt
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@ -104,6 +104,7 @@ option(MINIFB_BUILD_EXAMPLES "Build minifb example programs" TRUE)
if(APPLE AND NOT IOS)
option(USE_METAL_API "Build the project using metal API code" ON)
option(USE_INVERTED_Y_ON_MACOS "Use default mouse position: (0, 0) at (left, down)" OFF)
elseif(UNIX)
option(USE_WAYLAND_API "Build the project using wayland API code" OFF)
if(NOT USE_WAYLAND_API)
@ -180,6 +181,10 @@ elseif(APPLE)
add_definitions(-DUSE_METAL_API)
endif()
if(USE_INVERTED_Y_ON_MACOS)
add_definitions(-DUSE_INVERTED_Y_ON_MACOS)
endif()
list(APPEND SrcLib ${SrcMacOSX})
elseif(UNIX)

14
README.md
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@ -186,6 +186,20 @@ cd build
cmake .. -DUSE_METAL_API=OFF
```
#### Coordinate system
On MacOS, the default mouse coordinate system is (0, 0) -> (left, bottom). But as we want to create a multiplatform library we inverted the coordinates in such a way that now (0, 0) -> (left, top), like in the other platforms.
In any case, if you want to get the default coordinate system you can use the CMake flag: USE_INVERTED_Y_ON_MACOS=ON
```
mkdir build
cd build
cmake .. -DUSE_INVERTED_Y_ON_MACOS=ON
```
_Note: In the future, we may use a global option so that all platforms behave in the same way. Probably: -DUSE_INVERTED_Y_
if you use **tundra**:
```

6
src/macosx/OSXView.m
View File

@ -186,8 +186,12 @@
NSPoint point = [event locationInWindow];
//NSPoint localPoint = [self convertPoint:point fromView:nil];
window_data->mouse_pos_x = point.x;
#if defined(USE_INVERTED_Y_ON_MACOS)
window_data->mouse_pos_y = point.y;
kCall(mouse_move_func, point.x, point.y);
#else
window_data->mouse_pos_y = window_data->window_height - point.y;
#endif
kCall(mouse_move_func, window_data->mouse_pos_x, window_data->mouse_pos_y);
}
}