Notes

#include "graphics.h"
#include <math.h>
#include <stdlib.h>
#include <dos.h>
#include <windows.h>
#include <iostream>

using namespace std;

int xMin, xMax, yMin, yMax, a, b;
float alfa = 3.14 / 8;
float teta = 3.1415 / 180;

struct Pct2d {
float x;
float y;

Pct2d(float x = 0, float y = 0) {
this->x = x;
this->y = y;
}
};

struct Pct3d {
float x;
float y;
float z;

Pct3d(float x = 0, float y = 0, float z = 0) {
this->x = x;
this->y = y;
this->z = z;
}

};
Pct3d piramida[5];

Pct2d transf(Pct3d pct) {
float xPrim = (int)(pct.x - pct.y*cos(alfa));
float yPrim = (int)(pct.z - pct.y*sin(alfa));
Pct2d nou = Pct2d();
nou.x = xPrim;
nou.y = yPrim;

return nou;
}

void initializare() {

a = getmaxx();
b = getmaxy();
xMin = -a / 2;
xMax = a / 2;
yMin = -b / 2;
yMax = b / 2;

piramida[0] = Pct3d(50, 50, 0);
piramida[1] = Pct3d(250, 50, 0);
piramida[2] = Pct3d(250, 250, 0);
piramida[3] = Pct3d(50, 250, 0);
piramida[4] = Pct3d(150, 150, 250);
}

int Xe(float x) {

return (int)(floor)((x - xMin) / (xMax - xMin) *a);
}

int Ye(float y) {

return (int)(floor)((yMax - y) / (yMax - yMin)*b);
}

void axe3D() {
line(Xe(0), Ye(0), Xe(0), Ye(yMax)); //O-Y
line(Xe(0), Ye(0), Xe(xMax), Ye(0)); //O-X
line(Xe(0), Ye(0), Xe(0 + xMin*cos(alfa)), Ye(0 + xMin*sin(alfa))); //O-Z
}


void desPiramida() {
Pct2d piramida2d[5];
for (int i = 0; i < 5; i++) {
piramida2d[i] = transf(piramida[i]);
}
line(Xe(piramida2d[0].x), Ye(piramida2d[0].y), Xe(piramida2d[1].x), Ye(piramida2d[1].y));
line(Xe(piramida2d[1].x), Ye(piramida2d[1].y), Xe(piramida2d[2].x), Ye(piramida2d[2].y));
line(Xe(piramida2d[2].x), Ye(piramida2d[2].y), Xe(piramida2d[3].x), Ye(piramida2d[3].y));
line(Xe(piramida2d[3].x), Ye(piramida2d[3].y), Xe(piramida2d[0].x), Ye(piramida2d[0].y));
line(Xe(piramida2d[4].x), Ye(piramida2d[4].y), Xe(piramida2d[0].x), Ye(piramida2d[0].y));
line(Xe(piramida2d[4].x), Ye(piramida2d[4].y), Xe(piramida2d[1].x), Ye(piramida2d[1].y));
line(Xe(piramida2d[4].x), Ye(piramida2d[4].y), Xe(piramida2d[2].x), Ye(piramida2d[2].y));
line(Xe(piramida2d[4].x), Ye(piramida2d[4].y), Xe(piramida2d[3].x), Ye(piramida2d[3].y));
}

void transPiramida() {
int tx = 60, ty = 60, tz = 60;
for (int i = 0; i < 5; i++) {
piramida[i].x = piramida[i].x + tx;
piramida[i].y = piramida[i].y + ty;
piramida[i].z = piramida[i].z + tz;
}
setcolor(LIGHTBLUE);
desPiramida();
}
void scalPiramidaplus() {
float sx = 1.5, sy = 1.5, sz = 1.5;
for (int i = 0; i < 5; i++) {
piramida[i].x = piramida[i].x * sx;
piramida[i].y = piramida[i].y * sy;
piramida[i].z = piramida[i].z * sz;
}
setcolor(LIGHTRED);
desPiramida();
}
void scalPiramidaminus() {
float sx = 0.25, sy = 0.25, sz = 0.25;
for (int i = 0; i < 5; i++) {
piramida[i].x = piramida[i].x * sx;
piramida[i].y = piramida[i].y * sy;
piramida[i].z = piramida[i].z * sz;
}
setcolor(LIGHTGREEN);
desPiramida();
}


void piramidarotireOX() {
for (int step = 0;step < 360;step++) {
for (int i = 0;i < 5;i++) {
piramida[i].x = piramida[i].x;
piramida[i].y = piramida[i].y*cos(teta) - piramida[i].z*sin(teta);
piramida[i].z = piramida[i].y*sin(teta) + piramida[i].z*cos(teta);
cleardevice();
axe3D();
desPiramida();
delay(10);

}
}
}

void piramidarotireOY() {

for (int step = 0;step < 360;step++) {
for (int i = 0;i < 5;i++) {

piramida[i].x = piramida[i].x*cos(teta) - piramida[i].y*sin(teta);
piramida[i].y = piramida[i].x*sin(teta) + piramida[i].y*cos(teta);
piramida[i].z = piramida[i].z;
cleardevice();
axe3D();
desPiramida();
delay(10);

}
}
}

void
void main() {
initwindow(1080, 720);

initializare();


Pct3d p3d;
p3d.x = 120;
p3d.y = 60;
p3d.z = 60;
Pct2d p2d = transf(p3d);

putpixel(Xe(p2d.x), Ye(p2d.y), LIGHTRED);


piramidarotireOY();





getch();
closegraph();

}