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canvas-drawing-app
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Commit 1db57bb2 authored by Jalay 's avatar Jalay
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Delete EDFILE.C

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// Program to implement display file.
#include<graphics.h>
#include<conio.h>
#include<stdio.h>
#include<math.h>
#define NULL 0
#define FALSE 0
#define TRUE 1
#define START_POSITION 0
// link list for display file
typedef struct dp{
int opcode;
int x;
int y;
struct dp * next;
}dp;
// function declaration
int menu();
int inputMenu();
int deleteMenu();
dp* createNode();
int shiftingOfPointY(int );
int round(float);
void clear();
FILE * openFile(char *);
void closeFile(FILE *);
void readFromFile(dp *,FILE *);
void writeInFile(dp *,FILE *);
void inputDisplayCmd(dp *,int,int,int);
void deleteFromDisplayCmd(dp *);
void drawOnScreen(dp *,dp*);
void print(dp *,int);
// gobal variables
dp *head = NULL;
FILE *fptr = NULL;
dp* openeditor()
{ dp* temp;
fptr = openFile("r");
if(feof(fptr)) // no data in file
{
// printf("\n The File doesnot exists or File is Empty");
//closeFile(fptr);
// break;
}
if(head == NULL)
head = createNode();
readFromFile(head,fptr);
// printf("Reading from file successful.");
closeFile(fptr);
drawOnScreen(head,NULL);
if(head!=NULL) {
temp=head;
while(temp->next!=NULL)
temp=temp->next;
return temp;
}
return NULL;
}
void removeall() //implement eraseall
{
head=NULL;
}
void closeeditor()
{
if(head == NULL){
// printf("There is nothing to write to the file");
// break;
}
fptr = openFile("w");
writeInFile(head,fptr);
closeFile(fptr);
}
dp* saveeditor(dp* head,int opcode,int color,int x,int y)
{
if(head == NULL)
head = createNode();
inputDisplayCmd(head,opcode,x,y);
return head->next;
}
/*
void main(){
int gd=DETECT;
int gm=0;
initgraph(&gd,&gm,"..\\bgi");
while(1){
clear();
switch(menu()){
case 1:
{
// read from file
// clear();
// printf("\n");
fptr = openFile("r");
if(feof(fptr)) // no data in file
{
// printf("\n The File doesnot exists or File is Empty");
//closeFile(fptr);
break;
}
if(head == NULL)
head = createNode();
readFromFile(head,fptr);
// printf("Reading from file successful.");
closeFile(fptr);
break;
}
case 2:
{
// Write to file
// clear();
// printf("\n");
if(head == NULL){
// printf("There is nothing to write to the file");
break;
}
fptr = openFile("w");
writeInFile(head,fptr);
closeFile(fptr);
// printf("Writing on the file successful.");
break;
}
case 3:
{
// make a display command list
dp * temp;
clear();
if(head == NULL){
head = createNode();
inputDisplayCmd(head);
}else{
print(head,START_POSITION);
temp = head;
while(temp->next != NULL)
temp = temp->next;
inputDisplayCmd(temp);
}
break;
}
case 4:
{
// delete from display command list
clear();
if(head == NULL)
{
// printf("\n There is no list from delete");
break;
}
deleteFromDisplayCmd(head);
break;
}
case 5:
{
// draw on screen
clear();
if(head == NULL)
{
// printf("\n There is no list to Draw");
break;
}
drawOnScreen(head,NULL);
break;
}
case 6:
{
// display the command
clear();
if(head == NULL)
{
// printf("No data to display");
break;
}
// printf("\n The display file commands are : \n");
print(head,START_POSITION);
break;
}
case 0:
{ flushall();
exit(0);
}
default :
cleardevice();
// printf("\n You have given wrong command");
}// end of switch
getch();
} // end of while
}
*/
// main menu
int menu()
{
int value;
/*
printf("\n1. Read from File");
printf("\n2. Write to File");
printf("\n3. Add new command");
printf("\n4. Delete command");
printf("\n5. Draw On screen");
printf("\n6. Show display file");
printf("\n0. Exit"); */
scanf("%d",&value);
return value;
}
// create new node(object)
dp* createNode()
{
return (dp*)malloc(sizeof(dp));
}
// open given file
FILE * openFile(char* mode)
{
FILE *fptr;
fptr = fopen("..\\editor.dat",mode);
return fptr;
}
// close file
void closeFile(FILE *fptr)
{
fclose(fptr);
}
// writting data to the file in normalize form
void writeInFile(dp *record,FILE *fptr)
{
float x,y;
if(record->next != NULL)
{ // printf("F");
// convert to normalize form
x=((float)record->x)/((float)getmaxx());
y=((float)record->y)/((float)getmaxy());
fprintf(fptr,"%d %f %f ",record->opcode,x,y);
// printf("%f %f \n",x,y);
writeInFile(record->next,fptr);
}
return;
}
// reading data from the file and converting it to screen co-ordinate form
void readFromFile(dp * record,FILE *fptr)
{
int opcode;
float x,y;
while(1) {
fscanf(fptr,"%d",&opcode);
fscanf(fptr,"%f",&x);
fscanf(fptr,"%f",&y);
// printf("%f %f ",x,y);
if(!feof(fptr))
{ //printf("H");
record->opcode = opcode;
record->x = round(x*getmaxx()); // convert to screen form
record->y = round(y*getmaxy());
record->next = createNode();
}
else
{
record->next = NULL;
return ;
}
record=record->next; }
}
// round value to nearest integer
int round(float value)
{
int val;
if(value - (int)value <= 0.5)
val = floor(value);
else
val = ceil(value);
return val;
}
// function for inputing display file command
void inputDisplayCmd(dp *record,int opcode,int x,int y)
{
// int opcode,chk;
// int x,y;
/*
chk = inputMenu();
if(chk == -1)
{
record->opcode = -1;
record->x =-1;
record->y = -1;
record->next = NULL;
return;
}
printf("\n Enter values : ");
opcode=chk;
scanf("%d",&x);
scanf("%d",&y);
*/
record->opcode = opcode;
record->x = x;
record->y = y;
record->next = createNode();
//inputDisplayCmd(record->next);
}
int inputMenu()
{
int chk;
printf("\n Enter your Choice");
printf("\n0. Moveto");
printf("\n1. Lineto");
printf("\n2. Moverel");
printf("\n3. Linerel");
printf("\n-1. Return to Main Menu");
scanf("%d",&chk);
return chk;
}
// function for deleting display file command
void deleteFromDisplayCmd(dp *record)
{
int chk,count;
dp* prev=NULL;
while(1) {
if(head==NULL)
{
printf("\n Nothing to delete");
return;
}
chk = deleteMenu();
if(chk == -1)
return;
prev=NULL;
record=head;
for(count = 1;count <chk ;count++)
{
if(record->next == NULL)
{
printf("\n Nothing to delete");
return;
}
prev=record;
record = record->next;
}
if(record==head)
{
if(head->next!=NULL)
head=head->next;
else
head=NULL;
}
else
prev->next=record->next;
}
}
int deleteMenu()
{
int chk;
printf("\n Enter your Choice");
printf("\n The display file is : \n");
print(head,START_POSITION);
printf("\n Enter the position of the Object to delete or -1 to exit: ");
scanf("%d",&chk);
return chk;
}
void print(dp * record,int count)
{
if(record->next!= NULL)
{
printf(" %d -> %d (%d,%d)\n",++count,record->opcode,record->x,record->y);
print(record->next,count);
}
return;
}
void drawOnScreen(dp *record,dp* prev)
{ while(1) {
if(record->next == NULL)
return;
switch(record->opcode)
{
case 0:
{
moveto(record->x,record->y);
break;
}
case 1:
{
lineto(record->x,record->y);
break;
}
case 2:
{
moveto(prev->x+record->x,(prev->y+record->y));
break;
}
case 3:
{
lineto(prev->x+record->x,(prev->y+record->y));
break;
}
default:
{ }
}
prev=record;
record=record->next; }
}
int shiftingOfPointY(int y)
{
return getmaxy() - y;
}
void clear()
{
clrscr();
cleardevice();
}
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