First specify the starting points using left mouse click.Then press "k" to draw a given pattern.
#include <windows.h>
#include <gl/Gl.h>
#include <gl/glut.h>
#include <cmath>
int screenheight = 600;
int screenwidth = 800;
bool flag = true;
int first = 0;
double angle = 90;
double sangle = 45; //The angle for the rotation (in degrees)
typedef struct{
float x;
float y;
}Point2D;
Point2D p1,p2,p3,p4,sp1,sp2,sp3;
void DrawpolygonSegment(Point2D pt1, Point2D pt2,Point2D pt3,Point2D pt4)
{
glPointSize(1.0);
glBegin(GL_LINES);
glVertex2i(pt1.x, pt1.y);
glVertex2i(pt2.x, pt2.y);
glVertex2i(pt2.x, pt2.y);
glVertex2i(pt3.x, pt3.y);
glVertex2i(pt3.x, pt3.y);
glVertex2i(pt4.x, pt4.y);
glVertex2i(pt4.x, pt4.y);
glVertex2i(pt1.x, pt1.y);
glEnd();
glFlush();
}
void DrawLineSegment(Point2D pt1, Point2D pt2,Point2D pt3)
{
glLineWidth(1.0);
glBegin(GL_LINES);
glVertex2i(pt1.x, pt1.y);
glVertex2i(pt2.x, pt2.y);
glBegin(GL_LINES);
glVertex2i(pt2.x, pt2.y);
glVertex2i(pt3.x, pt3.y);
glEnd();
glFlush();
}
Point2D translate(Point2D p, float tx, float ty){
p.x =p.x+tx; //.....wite the equations for translation
p.y = p.y+ty; //.....wite the equations for translation
return p;
}
Point2D rotate(Point2D p,Point2D c, float ang){
ang = ang * 3.14 / 180.0; //angle in radians
Point2D ptemp;
ptemp.x = p.x * cos(ang) - p.y * sin(ang)+(c.x- cos(ang)*c.x +sin(ang)*c.y);
ptemp.y = p.x * sin(ang) + p.y * cos(ang)+(c.y- sin(ang)*c.x-cos(ang)*c.y);
return ptemp;
}
Point2D reflect_4(Point2D p){
Point2D ptemp;
ptemp.x=p.x;
ptemp.y=-p.y;
return ptemp;
}
Point2D Scale(Point2D p,double sx,double sy)
{
Point2D sp;
sp.x=sx*(p.x+90);
sp.y=sy*(p.y);
return sp;
}
void trans()
{
Point2D Trans_p1 = translate(p1,300,300);
Point2D Trans_p2 = translate(p2,300,300);
Point2D Trans_p3 = translate(p3,300,300);
DrawLineSegment(Trans_p1,Trans_p2,Trans_p3);
Point2D Scale_p1 = translate(Scale(p1,0.5,0.5),300,300);
Point2D Scale_p2 = translate(Scale(p2,0.5,0.5),300,300);
Point2D Scale_p3 = translate(Scale(p3,0.5,0.5),300,300);
DrawLineSegment(Scale_p1,Scale_p2,Scale_p3);
Point2D ref4_p1 =translate(reflect_4(p1),300,300);
Point2D ref4_p2 = translate(reflect_4(p2),300,300);
Point2D ref4_p3 = translate(reflect_4(p3),300,300);
DrawLineSegment(ref4_p1,ref4_p2,ref4_p3);
Point2D refScale4_p1 =translate(reflect_4(Scale(p1,0.5,0.5)),300,300);
Point2D refScale4_p2 = translate(reflect_4(Scale(p2,0.5,0.5)),300,300);
Point2D refScale4_p3 = translate(reflect_4(Scale(p3,0.5,0.5)),300,300);
DrawLineSegment(refScale4_p1,refScale4_p2,refScale4_p3);
//Point2D rotate_p1 =rotate(Trans_p1,angle);
int i=1;
while(i<=3){
Point2D rotate_p2 =rotate(Trans_p2,Trans_p1,angle*i);
Point2D rotate_p3 =rotate(Trans_p3,Trans_p1,angle*i);
Point2D rotate_p4 =rotate(ref4_p2,Trans_p1,angle*i);
DrawpolygonSegment(Trans_p1,rotate_p2,rotate_p3,rotate_p4);
Point2D rotate_Scalep1 =rotate(Scale_p1,Trans_p1,angle*i);
Point2D rotate_Scalep2 =rotate(Scale_p2,Trans_p1,angle*i);
Point2D rotate_Scalep3 =rotate(Scale_p3,Trans_p1,angle*i);
Point2D rotate_Scalep4 =rotate(refScale4_p2,Trans_p1,angle*i);
DrawpolygonSegment(rotate_Scalep1,rotate_Scalep2,rotate_Scalep3,rotate_Scalep4);
i++;
}
sp1.x=0;
sp1.y=0;
sp2.x=100;
sp2.y=16;
sp3.x=175;
sp3.y=0;
i=1;
while(i<=4){
if(i==1)sangle=45;
if(i==2)sangle=135;
if(i==3)sangle=225;
if(i==4)sangle=315;
Point2D Trans_sp1 = translate(sp1,300,300);
Point2D Trans_sp2 = translate(sp2,300,300);
Point2D Trans_sp3 = translate(sp3,300,300);
//DrawLineSegment(Trans_sp1,Trans_sp2,Trans_sp3);
Point2D rotate_sp2 =rotate(Trans_sp2,Trans_sp1,sangle);
Point2D rotate_sp3 =rotate(Trans_sp3,Trans_sp1,sangle);
DrawLineSegment(Trans_p1,rotate_sp2,rotate_sp3);
Point2D ref4_sp1 =translate(reflect_4(sp1),300,300);
Point2D ref4_sp2 =translate( reflect_4(sp2),300,300);
Point2D ref4_sp3 =translate( reflect_4(sp3),300,300);
Point2D rotateref_sp2 =rotate(ref4_sp2,Trans_sp1,sangle);
Point2D rotateref_sp3 =rotate(ref4_sp3,Trans_sp1,sangle);
DrawLineSegment(Trans_p1,rotateref_sp2,rotateref_sp3);
i++;
}
}
void key(unsigned char key, int x, int y)
{
if(key=='k') glutIdleFunc(trans);
}
void myMouse(int button, int state, int x, int y) {
if(state == GLUT_DOWN) {
if(button == GLUT_LEFT_BUTTON) {
p1.x=0;
p1.y=0;
p2.x=70;
p2.y=40;
p3.x=300;
p3.y=0;
//DrawLineSegment(p1,p2,p3);
}
}
}
void myDisplay(){
glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(0.0f, 0.0f, 0.0f);
}
int main( int argc, char ** argv ) {
glutInit( &argc, argv );
glutInitWindowPosition( 0, 0 );
glutInitWindowSize( 800, 600 );
glutCreateWindow( "My Drawing Screen" );
glMatrixMode( GL_PROJECTION );
glLoadIdentity();
gluOrtho2D( 0, 800, 0, 600 );
glViewport(0, 0, 800, 600);
glutDisplayFunc( myDisplay );
glutMouseFunc( myMouse );
glutKeyboardFunc(key);
glutMainLoop();
return( 0 );
}
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