Struct WindowCtx

Struct Documentation

struct WindowCtx

Context for input callbacks.

Public Functions

double aspect_ratio() const

return the aspect ratio of the viewport.

Returns:

The aspect ratio of the viewport.

std::pair<double, double> normalized_coordinates(double x, double y) const

return 2d coordinates normalized to (-1, 1) in the y-axis, given viewport coordinates.

PointViz renders 2d images and labels in this coordinate system, and as such this method can be used to determine if a pixel in viewport coordinates falls within a 2d image.

Parameters:

  • x[in] – X axis value of 2D viewport coordinate

  • y[in] – Y axis value of 2D viewport coordinate

Returns:

2d coordinates normalized to (-1, 1) in the y-axis

std::pair<double, double> viewport_coordinates(double normalized_x, double normalized_y) const

the inverse of “normalized_coordinates”.

Given 2d coordinates normalized to (-1, 1) in the y-axis, return viewport coordinates.

Parameters:

  • normalized_x[in] – X axis value of 2D normalized coordinate

  • normalized_y[in] – Y axis value of 2D normalized coordinate

Returns:

2d coordinates in viewport pixel space.

void check_invariants() const

raises std::logic_error if this WindowCtx doesn’t satisfy class invariants.

Public Members

bool lbutton_down = {false}

True if the left mouse button is held.

bool mbutton_down = {false}

True if the middle mouse button is held.

double mouse_x = {0}

Current mouse x position.

double mouse_y = {0}

Current mouse y position.

int viewport_width = {0}

Current viewport width in pixels.

int viewport_height = {0}

Current viewport height in pixels.

int window_width = {0}

Current window width in screen coordinates.

int window_height = {0}

Current window height in screen coordinates.