ircleshape.cpp

一个漂亮的万花筒游戏

// ircleShape.cpp: implementation of the CircleShape class.
//
//////////////////////////////////////////////////////////////////////
#include <assert.h>
#include "ezwin.h"
#include "math.h"
#include "WindowObject.h"
#include "Shape.h"
#include "ircleShape.h"

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

CircleShape::CircleShape(SimpleWindow &Window,
 const Position &center, const color &c,
 float d): Shape(Window, center, c), Diameter(d) {
	// No body needed
}

float CircleShape::GetDiameter() const {
	return Diameter;
}

void CircleShape::Draw() {
	Position Center = GetPosition();
	float Diameter = GetDiameter();
	const Position UpperLeft = Center
	 + Position(-.5f * Diameter, -.5f * Diameter);
	const Position LowerRight = Center
	 + Position(.5f * Diameter, .5f * Diameter);
	GetWindow().RenderEllipse(UpperLeft, LowerRight, GetColor(),
	 HasBorder());
	return;
}

void CircleShape::SetSize(float d) {
	Diameter = d;
   return;
}

void CircleShape::Erase() {
	Position Center = GetPosition();
	float Diameter = GetDiameter();
	const Position UpperLeft = Center
	 + Position(-.5f * Diameter, -.5f * Diameter);
	const Position LowerRight = Center
	 + Position(.5f * Diameter, .5f * Diameter);
	GetWindow().RenderEllipse(UpperLeft, LowerRight, White, HasBorder());
	return;
}