class Psychlops::Ellipse

Usage

Psychlops::Ellipse expresses inscribed ellipsoids inside a rectangle. Typically, a ellipse is designate its size by set and move to relative coordinate to center of window by centering and shift functions.

Typical usage:

Psychlops::Ellipse ellipse;
ellipse.set(100, 100).centering().shift(-100, 0);
ellipse.draw(Color::red);

Functions

Initialization

By decralation

Ellipse()
set the ellipse’s size as 0 * 0.
Ellipse(double left, double top, double right, double bottom)
Ellipse(double width, double height)
set the ellipse’s size as width * height. Left-Top corner is placed on (0,0).

By function

Ellipse& set(double left, double top, double right, double bottom)
Ellipse& set(double width, double height)
set the ellipse’s size as width * height. Left-Top corner is placed on (0,0).
Ellipse& resize(double width, double height)
resize the ellipse’s size as width * height. Center of the ellipse will be kept.

Translation

Rectangle& centering()
place the rectangle at center of the window.
Rectangle& centering(double x, double y)
Rectangle& centering(Point p)
place the ellipse centered at (x,y) or (p.x, p.y). Typically, the function is used with getCenter() as ellipse.centering(image.getCenter()).
Rectangle& shift(double h, double v)
move the ellipse by (h, v).

Drawing

void draw(color)
draw the ellipse with designated Color;

Getting parameters