trase::BackendGL Class Reference

Inheritance diagram for trase::BackendGL:

Collaboration diagram for trase::BackendGL:

Public Member Functions
void	init (const vfloat2_t &pixels, const char *name)
	Initialise this backend. More...
void	finalise ()
	Finalise this backend. Call after all drawing finished.
vfloat2_t	begin_frame ()
	Begin a new frame. More...
void	end_frame ()
	End the current frame. More...
bool	is_interactive ()
	Return true if this backend has mouse interaction.
bool	should_close ()
	Returns true if the current window should close (e.g. More...
float	get_time ()
	Get the current time.
vfloat2_t	get_mouse_pos ()
	Get the current position of the mouse in pixel units.
bool	mouse_dragging ()
	Returns true if the mouse button is clicked and the mouse is dragging.
vfloat2_t	mouse_drag_delta ()
	Current delta position of the dragging mouse.
void	mouse_drag_reset_delta ()
	Reset drag delta to zero.
void	scissor (const bfloat2_t &x)
	All subsequent drawing calls will be masked to only show within the bounding box x.
void	reset_scissor ()
	Remove a previously call to scissor()
void	rotate (const float angle)
	Apply a rotation of angle to the current drawing transform.
void	translate (const vfloat2_t &v)
	Apply a translation of v to the current drawing transform.
void	reset_transform ()
	Reset the drawing transform to the identity matrix.
void	begin_path ()
	Begin a path. More...
void	move_to (const vfloat2_t &x)
	Extends the current path. More...
void	line_to (const vfloat2_t &x)
	Extends the current path. More...
void	stroke ()
	Draw a line along the completed path. More...
void	fill ()
	Draw a line along the completed path and fill it in. More...
void	stroke_width (const float lw)
	Set the current stroke width. More...
void	stroke_color (const RGBA &color)
	Set the current stroke color. More...
void	fill_color (const RGBA &color)
	Set the current fill color. More...
void	rounded_rect (const bfloat2_t &x, const float r)
	Draw a rectangle with rounded corners. More...
void	rect (const bfloat2_t &x)
	Draw a rectangle. More...
void	circle (const vfloat2_t &centre, float radius)
	Draw a circle with a given centre and radius.
void	text (const vfloat2_t &x, const char *string, const char *end)
	Draw the given text to the screen. More...
bfloat2_t	text_bounds (const vfloat2_t &x, const char *string)
	Returns the bounding box covering the given text. More...
void	font_size (float size)
	Sets the current font height in pixels. More...
void	font_face (const char *face)
	Sets the current font name. More...
void	font_blur (const float blur)
	Sets the amount of blur to apply to the drawn text. More...
void	text_align (const int align)
	Sets the alignment of the text to its position. More...
Public Member Functions inherited from trase::Backend
virtual void	accept (Drawable &drawable, float time)=0

Static Public Member Functions
static void	set_mouse_down (const vfloat2_t &mouse_pos)
static void	set_mouse_up ()

Member Function Documentation

begin_frame()

vfloat2_t trase::BackendGL::begin_frame

(

)

Begin a new frame.

All drawing calls must be between begin_frame() and end_frame()

begin_path()

void trase::BackendGL::begin_path

(

)

Begin a path.

Subsequent calls to move_to() or line_to() defines the path to be drawn. The current path is completed by a call to stroke() or fill()

end_frame()

void trase::BackendGL::end_frame

(

)

End the current frame.

All drawing calls must be between begin_frame() and end_frame()

fill()

void trase::BackendGL::fill

(

)

Draw a line along the completed path and fill it in.

See also

begin_path()

fill_color()

void trase::BackendGL::fill_color

(

const RGBA &

color

)

Set the current fill color.

See also

fill()

font_blur()

void trase::BackendGL::font_blur

(

const float

blur

)

Sets the amount of blur to apply to the drawn text.

See also

text()

font_face()

void trase::BackendGL::font_face

(

const char *

face

)

Sets the current font name.

See also

text()

font_size()

void trase::BackendGL::font_size

(

float

size

)

Sets the current font height in pixels.

See also

text()

init()

void trase::BackendGL::init	(	const vfloat2_t &	pixels,
		const char *	name
	)

Initialise this backend.

Call before any drawing

Parameters

pixels	the size of the window in pixels
name	the name of the window

line_to()

void trase::BackendGL::line_to

(

const vfloat2_t &

x

)

Extends the current path.

Draws a straight line from the current "pen" position to x

See also

begin_path()

move_to()

void trase::BackendGL::move_to

(

const vfloat2_t &

x

)

Extends the current path.

Moves the current "pen" position to the position x

See also

begin_path()

rect()

void trase::BackendGL::rect

(

const bfloat2_t &

x

)

Draw a rectangle.

Parameters

x	the bounding box describing the rectangle

rounded_rect()

void trase::BackendGL::rounded_rect	(	const bfloat2_t &	x,
		const float	r
	)

Draw a rectangle with rounded corners.

Parameters

x	the bounding box describing the rectangle
r	the radius of the rounded corners

should_close()

bool trase::BackendGL::should_close

(

)

Returns true if the current window should close (e.g.

due to user interaction)

stroke()

void trase::BackendGL::stroke

(

)

Draw a line along the completed path.

See also

begin_path()

stroke_color()

void trase::BackendGL::stroke_color

(

const RGBA &

color

)

Set the current stroke color.

See also

stroke()

stroke_width()

void trase::BackendGL::stroke_width

(

const float

lw

)

Set the current stroke width.

See also

stroke()

text()

void trase::BackendGL::text	(	const vfloat2_t &	x,
		const char *	string,
		const char *	end
	)

Draw the given text to the screen.

Parameters

x	the position to draw the text
a	pointer to the text
end	the end of the text to draw (use nullptr to draw entire string)

text_align()

void trase::BackendGL::text_align

(

const int

align

)

Sets the alignment of the text to its position.

See also

text()

text_bounds()

bfloat2_t trase::BackendGL::text_bounds	(	const vfloat2_t &	x,
		const char *	string
	)

Returns the bounding box covering the given text.

Parameters

x	the drawing position of the text
string	pointer to the text

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The documentation for this class was generated from the following files:

• src/backend/BackendGL.hpp
• src/backend/BackendGL.cpp