geometry.cpp

   1 #include "geometry.h"
   2 #include "math.h"
   3
   4 const double PI = 3.14159265358979323846;
   5
   6 Linha::Linha(double x1,double y1,double x2, double y2) {
   7         vertices[0].x = x1;
   8         vertices[0].y = y1;
   9         vertices[1].x = x2;
  10         vertices[1].y = y2;
  11 }
  12
  13 void Linha::desenha() {
  14         glColor3f(0,0,0);
  15         glBegin(GL_LINES);
  16                 glVertex3f(vertices[0].x, vertices[0].y, 0.0f); // origin of the line
  17                 glVertex3f(vertices[1].x, vertices[1].y, 0.0f); // origin of the line
  18         glEnd( );
  19 }
  20
  21 void drawCircle(double radius, int lines)
  22 {
  23         double i2rad = PI/(lines/2.0);
  24         glBegin(GL_LINE_LOOP);
  25         for (int i=0; i < lines; i++) {
  26                 double degInRad = i*i2rad;
  27                 glVertex2f(cos(degInRad)*radius,sin(degInRad)*radius);
  28         }
  29
  30         glEnd();
  31 }