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BÀI TẬP THỰC HÀNH ĐỒ HỌA MÁY TÍNH_37DHTIN2

1 TRANSLATION – 2D

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

#include<math.h>

void main()

{

int ch;

int tx,ty;

int gd=DETECT,gm;

initgraph(&gd,&gm,"c:\\tc\\bgi");

setcolor(6);

printf("\n\n\tDoi tuong: ");

rectangle(100,150,150,100);

setcolor(2);

outtextxy(100,10,"TRANSLATION");

outtextxy(100,20," -");

printf("\n\ttx: ");

scanf("%d",&tx);

printf("\tty: ");

scanf("%d",&ty);

getch();

cleardevice();

outtextxy(100,10,"TRANSLATION");

outtextxy(100,20," -");

rectangle(100,150,150,100);

delay(1000);

rectangle(100+tx,150+ty,150+tx,100+ty);

getch();

closegraph();

}

2 Rotation, Scaling, Translation

#include<stdio.h>

#include<conio.h>

#include<graphics.h>

#include<math.h>

void translate();

void scale();

void rotate();

void main()

{

int ch;

int gd=DETECT,gm;

initgraph(&gd,&gm,"c:\\tc\\bgi");

setcolor(6);

outtextxy (100,88,"Object.");

rectangle(100,150,150,100);

printf(" -MENU -");

printf("\n 1)Translate\n 2)Scale\n 3)Rotate"); printf("\nHay nhan chon: ");

scanf("%d",&ch);

cleardevice();

switch(ch)

{

case 1: translate();

break;

case 2: scale();

break;

case 3: rotate();

break;

default: printf("Nhap sai lua chon"); break;

}

getch();

closegraph();

}

void translate()

{

int tx,ty;

setcolor(2);

outtextxy(240,10,"TRANSLATION"); outtextxy(238,20," -");

printf("\nNhap tx: ");

scanf("%d",&tx);

printf("\nNhap ty: ");

scanf("%d",&ty);

cleardevice();

rectangle(100,150,150,100);

printf("\nAfter Translation");

rectangle(100+tx,150+ty,150+tx,100+ty); }

void scale()

{

int sx,sy;

setcolor(2);

outtextxy(240,10,"SCALING");

outtextxy(238,20," -");

printf("\nNhap sx: ");

scanf("%d",&sx);

printf("\nNhap sy: ");

scanf("%d",&sy);

cleardevice();

rectangle(100,150,150,100);

printf("\nAfter Scaling");

rectangle(100*sx,150*sy,150*sx,100*sy); }

void rotate()

{

float theta;

int x1,x2,x3,x4;

int y1,y2,y3,y4;

int ax1,ax2,ax3,ax4,ay1,ay2,ay3,ay4; int refx,refy;

printf("\nNhap he so theta: ");

scanf("%f",&theta);

theta=theta*(3.14/180);

cleardevice();

setcolor(2);

outtextxy(240,10,"ROTATE");

outtextxy(238,20," -");

refx=100;

refy=100;

x1=100;

y1=100;

x2=150;

y2=100;

x3=150;

y3=150;

x4=100;

y4=150;

ax1=refy+(x1-refx)*cos(theta)-(y1-refy)*sin(theta); ay1=refy+(x1-refx)*sin(theta)+(y1-refy)*cos(theta); ax2=refy+(x2-refx)*cos(theta)-(y2-refy)*sin(theta); ay2=refy+(x2-refx)*sin(theta)+(y2-refy)*cos(theta); ax3=refy+(x3-refx)*cos(theta)-(y3-refy)*sin(theta); ay3=refy+(x3-refx)*sin(theta)+(y3-refy)*cos(theta); ax4=refy+(x4-refx)*cos(theta)-(y4-refy)*sin(theta); ay4=refy+(x4-refx)*sin(theta)+(y4-refy)*cos(theta); rectangle(100,150,150,100);

line(ax1,ay1,ax2,ay2);

line(ax2,ay2,ax3,ay3);

line(ax3,ay3,ax4,ay4);

line(ax4,ay4,ax1,ay1);

}

3 CohenSutherlandClipping

#include <stdio.h>

#include <graphics.h>

#include <conio.h>

#include <math.h>

#include <process.h>

#define TRUE 1

#define FALSE 0

typedef unsigned int outcode;

outcode CompOutCode(float x,float y);

enum

{

TOP = 0x1,

BOTTOM = 0x2,

RIGHT = 0x4,

LEFT = 0x8

};

float xmin,xmax,ymin,ymax;

void clip(float x0,float y0,float x1,float y1)

{

outcode outcode0,outcode1,outcodeOut;

int accept = FALSE,done = FALSE;

outcode0 = CompOutCode(x0,y0);

outcode1 = CompOutCode(x1,y1);

do

{

if(!(outcode0|outcode1))

{

accept = TRUE;

done = TRUE;

}

else

if(outcode0 & outcode1)

done = TRUE;

else

{

float x,y;

outcodeOut = outcode0?outcode0:outcode1; if(outcodeOut & TOP)

{

x = x0+(x1-x0)*(ymax-y0)/(y1-y0);

y = ymax;

}

else if(outcodeOut & BOTTOM) {

x = x0+(x1-x0)*(ymin-y0)/(y1-y0);

y = ymin;

}

else if(outcodeOut & RIGHT)

{

y = y0+(y1-y0)*(xmax-x0)/(x1-x0);

x = xmax;

}

else

{

y = y0+(y1-y0)*(xmin-x0)/(x1-x0);

x = xmin;

}

if(outcodeOut==outcode0)

{

x0 = x;

y0 = y;

outcode0 = CompOutCode(x0,y0); }

else

{

x1 = x;

y1 = y;

outcode1 = CompOutCode(x1,y1);

}

}

}while(done==FALSE);

if(accept)

line(x0,y0,x1,y1);

outtextxy(150,20,"POLYGON AFTER CLIPPING"); rectangle(xmin,ymin,xmax,ymax);

}

outcode CompOutCode(float x,float y)

{

outcode code = 0;

if(y>ymax)

code|=TOP;

else if(y<ymin)

code|=BOTTOM;

if(x>xmax)

code|=RIGHT;

else if(x<xmin)

code|=LEFT;

return code;

}

void main( )

{

float x1,y1,x2,y2;

int gdriver = DETECT, gmode, n,poly[14],i;

clrscr( );

printf("Nhap so canh da giac: ");

scanf("%d",&n);

printf("\nNhap toa do da giac: \n");

for(i=0;i<2*n;i++)

{

scanf("%d",&poly[i]);

}

poly[2*n]=poly[0];

poly[2*n+1]=poly[1];

printf("Nhap toa do vung cua so: \n");

scanf("%f%f%f%f",&xmin,&ymin,&xmax,&ymax); initgraph(&gdriver, &gmode, "c:\\tc\\bgi");

outtextxy(150,20,"POLYGON BEFORE CLIPPING"); drawpoly(n+1,poly);

rectangle(xmin,ymin,xmax,ymax);

getch( );

cleardevice( );

for(i=0;i<n;i++)

clip(poly[2*i],poly[(2*i)+1],poly[(2*i)+2],poly[(2*i)+3]); getch( );

restorecrtmode( );

}

4 Bezier

#include <stdio.h>

#include <conio.h>

#include <graphics.h>

#include <math.h>

void bezier(int x[4],int y[4])

{

int gd=DETECT,gm,i;

double u;

initgraph(&gd,&gm,"C:\\TC\\BGI");

setcolor(15);

outtextxy(400,400,"-> Diem dieu khien"); outtextxy(400,430,"-> Da dien");

outtextxy(400,460,"-> Bezier Curve");

setcolor(RED);

setfillstyle(1,RED);

circle(390,400,5);

floodfill(390,400,RED);

setcolor(YELLOW);

setfillstyle(1,YELLOW);

circle(390,430,5);

floodfill(390,430,YELLOW);

setcolor(WHITE);

setfillstyle(1,WHITE);

circle(390,460,5);

floodfill(390,460,WHITE);

delay(10);

for(u=0.0;u<1.0;u+=0.0002)

{

double xu= pow(1-u,3)*x[0]+3*u*pow(1-u,2)*x[1]+3*pow(u,2)*(1-u)*x[2]+pow(u,3)*x[3];

double yu= pow(1-u,3)*y[0]+3*u*pow(1-u,2)*y[1]+3*pow(u,2)*(1-u)*y[2]+pow(u,3)*y[3];

putpixel(xu,yu,WHITE);

delay(1);

}

for(i=0;i<4;i++)

{

setcolor(RED);

setfillstyle(1,RED);

circle(x[i],y[i],4);

floodfill(x[i],y[i],RED);

delay(1);

}

for(i=0;i<3;i++)

{

setcolor(YELLOW);

line(x[i],y[i],x[i+1],y[i+1]);

}

}

void main()

{

int x[4],y[4],i;

clrscr();

printf("\n\n====Bezier Curve====\n\n"); printf("Nhap toa do x,y 4 diem kiem soat :\n"); for(i=0;i<4;i++)

{

printf("x%d va y%d la:",i+1,i+1);

scanf("%d %d",&x[i],&y[i]);

}

bezier(x,y);

getch();

closegraph();

}

5 3D- Rotation, Scaling, Translation

#include<stdio.h>

#include<math.h>

#include<conio.h>

#include<graphics.h>

int gd=DETECT,gm,i,ch,sh,a1,b1,c1;

float temp,theta,temp1;

float a,b,c;

double x1,x2,y1,y2;

void draw_cube(double edge[20][3])

{

initgraph(&gd,&gm,"c:\\TC\\bgi");

clearviewport();

for(i=0;i<19;i++)

{

x1=edge[i][0]+edge[i][2]*(cos(2.3562)); y1=edge[i][1]-edge[i][2]*(sin(2.3562));

x2=edge[i+1][0]+edge[i+1][2]*(cos(2.3562)); y2=edge[i+1][1]-edge[i+1][2]*(sin(2.3562)); line(x1+320,240-y1,x2+320,240-y2);

} line(320,240,320,25);

line(320,240,550,240);

line(320,240,150,410);

getch();

closegraph();

}

void draw_cube1(double edge1[20][3])

{

initgraph(&gd,&gm,"c:\\TC\\bgi");

clearviewport();

for(i=0;i<19;i++)

{

x1=edge1[i][0]+edge1[i][2]*(cos(2.3562)); y1=edge1[i][1]-edge1[i][2]*(sin(2.3562));

x2=edge1[i+1][0]+edge1[i+1][2]*(cos(2.3562)); y2=edge1[i+1][1]-edge1[i+1][2]*(sin(2.3562)); line(x1+320,240-y1,x2+320,240-y2);

}

line(320,240,320,25);

line(320,240,550,240);

line(320,240,150,410);

getch();

closegraph();

}

void scale(double edge1[20][3],double edge[20][3])

{

printf("Nhap he so Scale : ");

scanf("%f %f %f",&a,&b,&c);

initgraph(&gd,&gm,"c:\\TC\\bgi");

clearviewport();

for(i=0;i<20;i++)

{

edge1[i][0]=edge[i][0]*a;

edge1[i][1]=edge[i][1]*b;

edge1[i][2]=edge[i][2]*c;

}

draw_cube1(edge1);

closegraph();

}

void translate(double edge1[20][3],double edge[20][3]) {

printf("Nhap he so Translation: ");

scanf("%d %d %d",&a1,&b1,&c1);

initgraph(&gd,&gm,"c:\\TC\\bgi");

clearviewport();

for(i=0;i<20;i++)

{

edge1[i][0]=edge[i][0]+a1;

edge1[i][1]=edge[i][1]+b1;

edge1[i][2]=edge[i][2]+c1;

}

draw_cube1(edge1);

closegraph();

}

void rotate(double edge1[20][3],double edge[20][3]) {

clrscr();

printf("-=[ Thuc don Rotate]=-\n");

printf("1:==> X-Axis \n");

printf("2:==> Y-Axis \n");

printf("3:==> Z-Axis \n");

printf(" Hay chon so: ");

scanf("%d",&ch);

printf("Nhap goc: ");

scanf("%f",&theta);

switch(ch)

{

case 1:

theta=(theta*3.14)/180;

for(i=0;i<20;i++) {

edge1[i][0]=edge[i][0];

temp=edge[i][1];

temp1=edge[i][2];

edge1[i][1]=temp*cos(theta)-temp1*sin(theta); edge1[i][2]=temp*sin(theta)+temp1*cos(theta); }

draw_cube1(edge1);

break;

case 2:

theta=(theta*3.14)/180;

for(i=0;i<20;i++) {

edge1[i][1]=edge[i][1];

temp=edge[i][0];

temp1=edge[i][2];

edge1[i][0]=temp*cos(theta)+temp1*sin(theta); edge1[i][2]=-temp*sin(theta)+temp1*cos(theta); }

draw_cube1(edge1);

break;

case 3:

theta=(theta*3.14)/180;

for(i=0;i<20;i++) {

edge1[i][2]=edge[i][2];

temp=edge[i][0];

temp1=edge[i][1];

edge1[i][0]=temp*cos(theta)-temp1*sin(theta); edge1[i][1]=temp*sin(theta)+temp1*cos(theta); }

draw_cube1(edge1);

break;

} }

void main()

{

int choice;

double edge1[20][3],edge[20][3]={

100,0,0, 100,100,0, 0,100,0, 0,100,100, 0,0,100, 0,0,0, 100,0,0, 100,0,100, 100,75,100, 75,100,100, 100,100,75, 100,100,0, 100,100,75, 100,75,100, 75,100,100, 0,100,100,

0,100,0, 0,0,0, 0,0,100, 100,0,100 };

while(1)

{

clrscr();

printf("3D BASIC TRANSFORMATIONS\n"); printf("1:==> Draw Cube\n");

printf("2:==> Translate\n");

printf("3:==> Scaling \n");

printf("4:==> Rotation \n");

printf("5:==> Exit \n");

printf("Hay chon so: ");

scanf("%d",&choice);

switch(choice) {

case 1:

draw_cube(edge);

break;

case 2:

translate(edge1,edge);

break;

case 3:

scale(edge1,edge);

break;

case 4:

rotate(edge1,edge);

break;

case 5:

exit(0);

default:

printf(" Nhap sai Nhan phim bat ky!!! "); exit();

getch();

break;

}

getch();

closegraph();

}

}