apply_pan_zoom_pan()

MAYAFLUX_API void MayaFlux::Kinesis::apply_pan_zoom_pan	(	PanZoom2DState &	state,
		float	dx,
		float	dy,
		float	viewport_width,
		float	viewport_height
	)

Pan by a pixel delta, scaled to world units by the current zoom level.

Scaling by zoom ensures pan speed stays proportionate to zoom level.

Parameters

state	PanZoom2D state (pan mutated).
dx	Horizontal pixel delta (positive = right).
dy	Vertical pixel delta (positive = up).
viewport_width	Framebuffer width in pixels.
viewport_height	Framebuffer height in pixels.

Definition at line 33 of file PanZoom2DState.cpp.

{
    const float aspect = viewport_width / viewport_height;
    const glm::vec2 delta = drag_to_offset_delta(
        { dx, dy },
        { 2.0F * st.zoom * aspect, 2.0F * st.zoom },
        { viewport_width, viewport_height });
 
    st.pan.x -= delta.x;
    st.pan.y += delta.y;
}

References drag_to_offset_delta(), MayaFlux::Kinesis::PanZoom2DState::pan, and MayaFlux::Kinesis::PanZoom2DState::zoom.

Referenced by MayaFlux::bind_pan_zoom_preset().

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