#include <math.h>

#include <helianthus.h>

#define LINE 0.05

#define DOT  0

double dx = 0.4;

double dy = 0.4;

void drawLine(double pos) {

  line(0, 0, pos, 0);

  circle(0, 0, DOT);

  circle(pos, 0, DOT);

}

void drawQuad(double pos) {

  saveState();

  noFill();

  moveTo(0, 0);

  lineTo(1, 0);

  lineTo(1, pos);

  lineTo(0, pos);

  closePath();

  restoreState();

  circle(0, 0, DOT);

  circle(1, 0, DOT);

  circle(0, pos, DOT);

  circle(1, pos, DOT);

}

void drawCube(double pos) {

  double ddx = pos*dx;

  double ddy = pos*dy;

  saveState();

  noFill();

  moveTo(0, 0);

  lineTo(1, 0);

  lineTo(1, 1);

  lineTo(0, 1);

  closePath();

  moveTo(ddx + 0, ddy + 0);

  lineTo(ddx + 1, ddy + 0);

  lineTo(ddx + 1, ddy + 1);

  lineTo(ddx + 0, ddy + 1);

  closePath();

  line(0, 0, ddx + 0, ddy + 0);

  line(1, 0, ddx + 1, ddy + 0);

  line(0, 1, ddx + 0, ddy + 1);

  line(1, 1, ddx + 1, ddy + 1);

  restoreState();

  circle(0, 0, DOT);

  circle(1, 0, DOT);

  circle(0, 1, DOT);

  circle(1, 1, DOT);

  circle(ddx + 0, ddx + 0, DOT);

  circle(ddx + 1, ddx + 0, DOT);

  circle(ddx + 0, ddx + 1, DOT);

  circle(ddx + 1, ddy + 1, DOT);

}

void init() {

}

void draw() {

  double w = windowGetWidth();

  double h = windowGetHeight();

  double t = windowGetSeconds();

  saveState();

  translate(w/2, h/2);

  zoom(100);

  translate(-0.5, -0.5);

  fill(COLOR_BLACK);

  stroke(COLOR_BLACK);

  strokeWidth(LINE);

  double a = t/3*2*PI;

  double pos = 0.5*(1 - cos(a))*3;

  if (pos < 1) drawLine(pos); else

    if (pos < 2) drawQuad(pos-1); else

      drawCube(pos-2);

  restoreState();

}

int main() {

  windowSetVariableFrameRate();

  windowSetResizable(TRUE);

  windowSetInit(&init);

  windowSetDraw(&draw);

  windowRun();

  return 0;

}