我在分配给我的任务时遇到问题，问题是我找不到任何与我获得的代码类似的资源。我已经阅读了很多文件，试图找到相似之处，但找不到任何有用的东西。
我需要帮助来尝试理解此代码以及如何使用它来创建菱形。我唯一不明白的是如何创建一个属于 Shape 类的菱形。将质心应用于该菱形，然后使用 push_back 方法添加顶点。不幸的是，需要使用这种推回方法，我只使用 drawLine(10,10,40,10); 考试失败了。等在我想要的地方画线。
我会用一周的时间来解决这个问题，所以我应该迅速做出反应。
//This is the rhombus.cpp file
#include "rhombus.h"
Rhombus::Rhombus(Vertex point, int radius) : Shape(point)
{
if((radius>centroid.getX()/2) || (radius>centroid.getY()/2)) // Inteded to be a y?
{
cout << "Object must fit on screen." << endl;
system("pause");
exit(0);
}
Rhombus shape1(20, 20);
shape1.plotVertices();
}
void Rhombus::plotVertices()
{
//vertices.push_back(Vertex(centroid.getX(), centroid.getY() + radius));
//vertices.push_back(Vertex(centroid.getX(), centroid.getY()));
//vertices.push_back(Vertex(centroid.getX(), centroid.getY()));
//vertices.push_back(Vertex(centroid.getX(), centroid.getY()));
}
// This is the rhombus.h file
#include "shape.h"
class Rhombus : public Shape
{
int radius;
void plotVertices();
Rhombus(Vertex point, int radius = 10);
int area();
int perimeter();
};
// This is the shape.cpp file
#include "shape.h"
Shape::Shape(Vertex point) : centroid(point)
{
// constructs a shape
}
void Shape::drawShape()
{
list<Vertex>::iterator current = vertices.begin();
list<Vertex>::iterator previous = vertices.begin();
while(current!=vertices.end())
{
Console::gotoXY((*current).getX(),(*current).getY());
cout << "*";
if(current!=vertices.begin())
drawLine((*current).getX(),(*current).getY(), (*previous).getX(), (*previous).getY());
previous = current;
current++;
}
previous = vertices.begin();
//Debug assertion error here.
drawLine(vertices.back().getX(), vertices.back().getY(), vertices.front().getX(), vertices.front().getY());
}
void Shape::drawLine(int x1, int y1, int x2, int y2)
{
bool steep = (abs(y2 - y1) > abs(x2 - x1));
if(steep)
{
swap(x1, y1);
swap(x2, y2);
}
if(x1 > x2)
{
swap(x1, x2);
swap(y1, y2);
}
int dx = x2 - x1;
int dy = abs(y2 - y1);
float error = dx / 2.0f;
int ystep = (y1 < y2) ? 1 : -1;
int y = y1;
int maxX = x2;
for(int x=x1; x<maxX; x++)
{
if(steep)
{
Console::gotoXY(y,x);
cout << "*";
}
else
{
Console::gotoXY(x,y);
cout << "*";
}
error -= dy;
if(error < 0)
{
y += ystep;
error += dx;
}
}
}
double Shape::round(double x)
{
if (ceil(x+0.5) == floor(x+0.5))
{
int a = (int) ceil(x);
if (a%2 == 0)
return ceil(x);
else
return floor(x);
}
else
return floor(x+0.5);
}
void Shape::outputStatistics()
{
}
// This is the shape.h file
#pragma once
#include "console.h"
#include "vertex.h"
#include <iostream>
#include <list>
#include <cstdlib>
#include <cmath>
using namespace std;
#define PI 3.14159265358979323846
class Shape
{
list<Vertex>::iterator itr;
protected:
list<Vertex> vertices;
Vertex centroid;
void drawLine(int x1, int y1, int x2, int y2);
Shape(Vertex point);
double round(double x);
public:
void drawShape();
virtual int area() = 0;
virtual int perimeter() = 0;
virtual void outputStatistics();
void rotate(double degrees);
void scale(double factor);
};