geometry.cpp

   1 #include "geometry.h"
   2 #include "math.h"
   3 #include <vector>
   4
   5 const double PI = 3.14159265358979323846;
   6
   7 Linha::Linha(double x1,double y1,double x2, double y2) {
   8         vertices[0].x = x1;
   9         vertices[0].y = y1;
  10         vertices[1].x = x2;
  11         vertices[1].y = y2;
  12 }
  13
  14 Rect::Rect(double x1,double y1,double x2, double y2) {
  15         vertices[0].x = x1;
  16         vertices[0].y = y1;
  17         vertices[1].x = x2;
  18         vertices[1].y = y2;
  19         normaliza();
  20 }
  21
  22 void Rect::normaliza() {
  23         double xmin,xmax,ymin,ymax;
  24         xmin = std::min(vertices[0].x,vertices[1].x);
  25         xmax = std::max(vertices[0].x,vertices[1].x);
  26         ymin = std::min(vertices[0].y,vertices[1].y);
  27         ymax = std::max(vertices[0].y,vertices[1].y);
  28         vertices[0].x = xmin;
  29         vertices[1].x = xmax;
  30         vertices[0].y = ymin;
  31         vertices[1].y = ymax;
  32 }
  33
  34 void Linha::desenha() {
  35         glColor3f(0,0,0);
  36         glBegin(GL_LINES);
  37                 glVertex3f(vertices[0].x, vertices[0].y, 0.0f); // origin of the line
  38                 glVertex3f(vertices[1].x, vertices[1].y, 0.0f); // origin of the line
  39         glEnd( );
  40 }
  41
  42 void drawCircle(double radius, int lines)
  43 {
  44         double i2rad = PI/(lines/2.0);
  45         glBegin(GL_LINE_LOOP);
  46         for (int i=0; i < lines; i++) {
  47                 double degInRad = i*i2rad;
  48                 glVertex2f(cos(degInRad)*radius,sin(degInRad)*radius);
  49         }
  50
  51         glEnd();
  52 }