Grafika komputer prak 4

/* Praktikum 04
* Membuat objek garis diagonal dengan DDA dan Bresenham
*/
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <glut.h>
#include <math.h>
void display(void)
{
//set display-window background color to white
glClearColor(1.0,1.0,1.0,0.0);
//set projection paramaters
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0.0,300.0,0.0,300.0);
}
void setPixel(GLint xCoordinate, GLint yCoordinate)
{
glBegin(GL_POINTS);
glVertex2i(xCoordinate,yCoordinate);
glEnd();
glFlush();
}
//Procedure Bresenham line-drawing untuk |m| < 1.0
void lineBres(GLint x0, GLint y0, GLint xEnd, GLint yEnd)
{
GLint dx = (float)fabs((float) xEnd - x0);
GLint dy = (float)fabs((float) yEnd - y0);
GLint p = 2 * dy - dx;
GLint twoDy = 2 * dy;
GLint twoDyMinusDx = 2 * (dy-dx);
GLint x,y;
// determine which endpoint to use as start position
if(x0 > xEnd){
x = xEnd;
y = yEnd;
xEnd = x;
}else{
x = x0;
y = y0;
}
setPixel(x,y);

while(x<xEnd){
x++;
if(p<0)
p += twoDy;
else{
y++;
p += twoDyMinusDx;
}
setPixel(x,y);
}
}
void drawMyLine(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0,0.0,0.0);
glPointSize(4.0);
GLint x0 = 100;
GLint y0 = 150;
GLint xEnd = 200;
GLint yEnd = 200;
lineBres(x0,y0,xEnd,yEnd);
}
int main(int argc, char** argv)
{
//initialize GLUT
glutInit(&argc,argv);
//initialize display mode
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
//set display-window width & height
glutInitWindowSize(400,400);
//set display-window upper-left position
glutInitWindowPosition(0,0);
//create display-window with a title
glutCreateWindow("Digital Differential Analyzer Algorithm");
//initialze OpenGL
display();
//call graphics to be displayed on the window
glutDisplayFunc(drawMyLine);
//display everything and wait
glutMainLoop();
return 0;
}

postest


/* Praktikum 04
* Membuat objek garis dengan DDA dan Bresenham
*/
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <glut.h>
#include <math.h>
void display(void)
{
//set display-window background color to white
glClearColor(1.0,1.0,1.0,0.0);
//set projection paramaters
glMatrixMode(GL_PROJECTION);
gluOrtho2D(0.0,300.0,0.0,300.0);
}
void setPixel(GLint xCoordinate, GLint yCoordinate)
{
glBegin(GL_POINTS);
glVertex2i(xCoordinate,yCoordinate);
glEnd();
glFlush();
}
//Procedure Bresenham line-drawing untuk |m| < 1.0
void lineBres(GLint x0, GLint y0, GLint xEnd, GLint yEnd)
{ //kordinat
GLint dx = (float)fabs((float) xEnd - x0);
GLint dy = (float)fabs((float) yEnd - y0);
GLint p = 2 * dy - dx;
GLint twoDy = 2 * dy;
GLint twoDyMinusDx = 2 * (dy-dx);
GLint x,y;
// determine which endpoint to use as start position
if(x0 > xEnd){
x = xEnd;
y = yEnd;
xEnd = x;
}else{
x = x0;
y = y0;
}
setPixel(x,y);

while(x<xEnd){
x++;
if(p<0)
p += twoDy;
else{
y++;
p += twoDyMinusDx;
}
setPixel(x,y);
}
}
void drawMyLine(void)
{
glClear(GL_COLOR_BUFFER_BIT);
glColor3f(1.0,0.0,0.0); //warna untuk garis
glPointSize(5.0); //ketebalan garis
GLint x0 = 100; //panjang garis awal
GLint y0 = 150; //titik awal
GLint xEnd = 200;//panjang garis akhir
GLint yEnd = 200;//titik akhir
lineBres(x0,y0,xEnd,yEnd);

glColor3f(0.0,0.0,1.0); //warna untuk garis
glPointSize(4.0); //ketebalan garis
GLint x1 = 100; //panjang garis awal
GLint y1 = 150; //titik awal
GLint xEnd1 = 150;//panjang garis akhir
GLint yEnd1 = 300;//titik akhir
lineBres(x1,y1,xEnd1,yEnd1);

glColor3f(0.0,1.0,0.0); //warna untuk garis
glPointSize(3.0); //ketebalan garis
GLint x2 = 150; //panjang garis awal
GLint y2 = 200; //titik awal
GLint xEnd2 = 200;//panjang garis akhir
GLint yEnd2 = 200;//titik akhir
lineBres(x2,y2,xEnd2,yEnd2);
}
int main(int argc, char** argv)
{
//initialize GLUT
glutInit(&argc,argv);
//initialize display mode
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
//set display-window width & height
glutInitWindowSize(400,400);
//set display-window upper-left position
glutInitWindowPosition(0,0);
//create display-window with a title
glutCreateWindow("Digital Differential Analyzer Algorithm");
//initialze OpenGL
display();
//call graphics to be displayed on the window
glutDisplayFunc(drawMyLine);
//display everything and wait
glutMainLoop();
return 0;
}