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Add guide documentation & fixes
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@ -132,7 +132,7 @@ information on what to include when reporting a bug.
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- [Null] Added EGL context creation on Mesa via `EGL_MESA_platform_surfaceless`
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- [EGL] Allowed native access on Wayland with `GLFW_CONTEXT_CREATION_API` set to
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`GLFW_NATIVE_CONTEXT_API` (#2518)
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- [Cocoa] Added `glfwSetTrackpadZoomCallback` and `glfwSetTrackpadRotateCallback`
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- [Cocoa & Wayland] Added `glfwSetTrackpadZoomCallback` and `glfwSetTrackpadRotateCallback`
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for trackpad zoom and rotate events (#90)
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@ -581,6 +581,42 @@ void scroll_callback(GLFWwindow* window, double xoffset, double yoffset)
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A normal mouse wheel, being vertical, provides offsets along the Y-axis.
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### Trackpad zoom and rotate {#input_mouse_trackpad_gestures}
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Trackpad events are currently only available on macOS and Wayland (Linux).
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If you wish to be notified when a zoom gesture is performed on a trackpad,
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set the trackpadZoom callback.
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```c
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glfwSetTrackpadZoomCallback(window, trackpad_zoom_callback);
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```
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The callback function receives the scale of the zoom, which is a ratio that
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should be multiplied by the current zoom level to get the new zoom level.
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```c
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static void trackpad_zoom_callback(GLFWwindow* window, double scale)
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{
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my_app->zoom_level *= scale;
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}
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```
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For trackpad rotate gestures, set the trackpadRotateCallback.
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```c
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glfwSetTrackpadRotateCallback(window, trackpad_rotate_callback);
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```
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The callback function recieves the angle, in degrees, to rotate by.
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```c
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static void trackpad_rotate_callback(GLFWwindow* window, double angle)
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{
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my_app->rotation_angle_degrees += angle;
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}
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```
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## Joystick input {#joystick}
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@ -1880,7 +1880,8 @@ typedef void (* GLFWscrollfun)(GLFWwindow* window, double xoffset, double yoffse
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* @endcode
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*
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* @param[in] window The window that received the event.
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* @param[in] scale The manigification amount, as a scale factor
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* @param[in] scale The manigification amount, to be multiplied by the current
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* scale factor to get the new scale factor.
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*
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* @sa @ref glfwSetTrackpadZoomCallback
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*
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@ -1069,7 +1069,7 @@ GLFWAPI GLFWtrackpadzoomfun glfwSetTrackpadZoomCallback(GLFWwindow* handle,
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return cbfun;
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}
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GLFWAPI GLFWtrackpadzoomfun glfwSetTrackpadRotateCallback(GLFWwindow* handle,
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GLFWAPI GLFWtrackpadrotatefun glfwSetTrackpadRotateCallback(GLFWwindow* handle,
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GLFWtrackpadrotatefun cbfun)
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{
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_GLFWwindow* window = (_GLFWwindow*) handle;
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