Transformasi Grafik menggunakan bentuk translasi dengan Empat Titik || Dev++

Transformasi Grafik 

Translasi dengan Empat Titik 

Grafika komputer

Untuk menggambarkan translasi suatu objek berupa persegi dengan koordinat A(20,20) B(40,20), C(40,40) dan D(20,40) dengan tx,ty(20,30), tentukan koordinat yang barunya ?

Jawab : 

Proses Penghitungan Translasi

Rumus yang di gunakan :

 x‟ = x + tx (x,y) = titik asal sebelum translasi 

 y"= y + ty (x‟,y‟) = titik baru hasil translasi 

Titik A

x'A = xA +tx

       = 20+20=40

y'A = yA +ty

       =20+30=50

A'=(40,50)

Titik B

x'B = xB +tx

       =40+20=60

y'B = yB +ty

       =20+20=40

B'=(60,40)

Titik C

x'C = xC +tx

       =40+20=60

y'C = yC +ty

       =40+30=70

C'=(60,70)

Titik D

x'D = xD +tx

       =20+20=40

y'D = yD +ty

       =40+20=60

D'=(40,60)

Koding

#include <windows.h> 

#include <GL/gl.h> 

#include <GL/glut.h> 

#include <stdio.h>

int Xa1, Xa2, Xa3, Xa4, //nilai titik awal

 Ya1, Ya2, Ya3, Ya4;

 

int pindah_x, pindah_y; //nilai perpindahan

int hasil_Xa1, hasil_Xa2, hasil_Xa3, hasil_Xa4, //hasil perpindahan titik

 hasil_Ya1, hasil_Ya2, hasil_Ya3, hasil_Ya4; 

void display (void){

glClearColor(1.0f, 1.0f, 1.0f, 1.0f);

glClear(GL_COLOR_BUFFER_BIT);

//posisi objek awal

glColor3f(0.0, 0.0, 0.0);

glBegin(GL_POLYGON);

glVertex3f(Xa1, Ya1, 0.0);

glVertex3f(Xa2, Ya2, 0.0);

glVertex3f(Xa3, Ya3, 0.0);

glVertex3f(Xa4, Ya4, 0.0);

glEnd();

//posisi hasil Translasi

glColor3f(0.0, 0.0, 0.0);

glBegin(GL_POLYGON);

glVertex3f(hasil_Xa1, hasil_Ya1, 0.0);

glVertex3f(hasil_Xa2, hasil_Ya2, 0.0);

glVertex3f(hasil_Xa3, hasil_Ya3, 0.0);

glVertex3f(hasil_Xa4, hasil_Ya4, 0.0);

glEnd();

 

glFlush();

}

void reshape(int lebar, int tinggi){

glViewport(0,0,(GLsizei)lebar, (GLsizei) tinggi);

glMatrixMode(GL_PROJECTION);

glLoadIdentity();

gluOrtho2D (0.0, (GLdouble)lebar, 0.0,(GLdouble)tinggi);

}

int main(int argc, char *argv[]){

 printf("\nInput Nilai Titik Koordinat Objek");

 printf("\n================================");

 printf("\n Titik Kordinat 1 ");

 printf("\n================================");

 printf("\nMasukan Nilai X Titik A1 = ");

 scanf("%i",&Xa1);

 printf("\nMasukan Nilai Y Titik A1 = ");

 scanf("%i",&Ya1);

 printf("\n================================");

 

 printf("\n================================");

 printf("\n Titik Kordinat 2 ");

 printf("\n================================");

 printf("\nMasukan Nilai X Titik A2 = ");

 scanf("%i",&Xa2);

 printf("\nMasukan Nilai Y Titik A2 = ");

 scanf("%i",&Ya2);

 printf("\n================================");

 printf("\n================================");

 printf("\n Titik Kordinat 3 ");

 printf("\n================================");

 printf("\nMasukan Nilai X Titik A3 = ");

 scanf("%i",&Xa3);

 printf("\nMasukan Nilai Y Titik A3 = ");

 scanf("%i",&Ya3);

 printf("\n================================");

 

 printf("\n================================");

 printf("\n Titik Kordinat 4 ");

 printf("\n================================");

 printf("\nMasukan Nilai X Titik A4 = ");

 scanf("%i",&Xa4);

 printf("\nMasukan Nilai Y Titik A4 = ");

 scanf("%i",&Ya4);

 printf("\n================================");

 

 //buatkan input untuk nilai perpindahan

 printf("\n================================");

 printf("\n Titik Translasi ");

 printf("\n================================");

 printf("\nMasukan Nilai Translasi Sumbu X = ");

 scanf("%i",&pindah_x);

 printf("\nMasukan Nilai Translasi Sumbu Y = ");

 scanf("%i",&pindah_y);

 printf("\n================================");

hasil_Xa1 = Xa1 + pindah_x; //proses transalasi titik A

 hasil_Ya1 = Ya1 + pindah_y;

 

 hasil_Xa2 = Xa2 + pindah_x; //proses transalasi titik B

 hasil_Ya2 = Ya2 + pindah_y;

 

 hasil_Xa3 = Xa3 + pindah_x; //proses transalasi titik C

 hasil_Ya3 = Ya3 + pindah_y;

 

hasil_Xa4 = Xa4 + pindah_x; //proses transalasi titik D

 hasil_Ya4 = Ya4 + pindah_y;

 

 

glutInit(&argc, argv);

glutInitDisplayMode(GLUT_SINGLE|GLUT_RGB);

glutInitWindowSize(1200,600);

glutInitWindowPosition(100,100);

glutCreateWindow("Transformasi Grafik dg translasi 4 Titik");

glutDisplayFunc(display);

glutReshapeFunc(reshape);

glutMainLoop();

return 0; 

}

Jangan lupa masukan Linker sebelum di Run :

-lopengl32 

-lfreeglut

-lglu32