Drawing Class Reference

#include <Drawing.h>

Public Member Functions
	Drawing ()
	~Drawing ()
Shape *	get_selected_shape ()
color	get_background_color ()
void	set_background_color (color)
void	add_shape (Shape *)
void	select_shape_at_point (point2d)
void	draw ()
void	delete_selected_shape ()
void	move_selected_shape_up ()
void	move_selected_shape_down ()

Private Attributes
std::vector< Shape * >	_shapes
Shape *	_selected_shape
color	_background_color

Detailed Description

The Drawing class holds references to all the shapes and can draw them all to the screen in order, as well as selecting, reordering and removing shapes on screen

Constructor & Destructor Documentation

Drawing::Drawing

(

)

The constructor initialises the _selected_shape and _background_color data members

Drawing::~Drawing

(

)

Upon destruction, memory for each shape the drawing holds is freed (ie. each shape is deleted)

Member Function Documentation

void Drawing::add_shape

(

Shape *

shape

)

Adds a Shape to the drawing

Parameters

shape

the shape to add

void Drawing::delete_selected_shape

(

)

Deletes the selected shape from the drawing, freeing it's memory and removing it from _shapes

void Drawing::draw

(

)

Clears the screen with the background colour, then draws each of the Shape objects with their draw method. Also highlights the selected shape.

color Drawing::get_background_color

(

)

Gets the background colour

Returns

the background colour

Shape * Drawing::get_selected_shape

(

)

Gets the selected shape

Returns

the selected shape

void Drawing::move_selected_shape_down

(

)

Moves the selected shape down in the array, unless it is the first already

void Drawing::move_selected_shape_up

(

)

Moves the selected shape up in the array, unless it is the last already

void Drawing::select_shape_at_point

(

point2d

point

)

Selects the shape that is at the point point by checking if each Shape::is_at the point

Parameters

point

the point to select the shape at

void Drawing::set_background_color

(

color

bg

)

Sets the background colour

Parameters

bg	background colour

Member Data Documentation

color Drawing::_background_color

private

The background colour of the drawing canvas

Shape* Drawing::_selected_shape

private

Pointer to the selected shape

std::vector<Shape *> Drawing::_shapes

private

Vector array of the shape references, creates a "has many" relationship

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

• src/Drawing.h
• src/Drawing.cpp