score::gfx::PointerState Struct Reference

Detailed Description

The pointers over an output: the mouse and the touch points, in the layout of vertexshaderart's touch history (greggman/vertexshaderart, src/js/main.js, addTouchPosition / addTouchPressure / getTouchIndex). Slot 0 is the mouse or the first finger, slot 1 the second finger, and so on, 32 of them.

Positions are in clip space: x and y in [-1, 1], y up (main.js x * 2 - 1, y * -2 + 1 over the canvas). A slot keeps its last position when released; only its pressure drops to 0, as on the site.

The window writes from the GUI thread, a renderer reads a snapshot from the render thread.

Classes
struct	Slot

Public Member Functions
void	move (int slot, float x, float y) noexcept
void	press (int slot, float pressure) noexcept
int	slotForTouch (int id) noexcept
void	releaseTouch (int id) noexcept
std::array< Slot, slots >	snapshot () const noexcept

Static Public Member Functions
static QPointF	toClip (QPointF win, QSizeF sz) noexcept
	Window position -> clip space over a window of size sz.

Static Public Attributes
static constexpr int	slots = 32

Member Function Documentation

slotForTouch()

int score::gfx::PointerState::slotForTouch ( int  id )

inlinenoexcept

Slot of the touch point id, allocating the first free one (main.js getTouchIndex). All slots taken: start over, as the site does.

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The documentation for this struct was generated from the following file:

• PointerState.hpp