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display.c
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display.c
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/*====================== display.c ========================
Contains functions for basic manipulation of a screen
represented as a 2 dimensional array of colors.
A color is an ordered triple of ints, with each value standing
for red, green and blue respectively
==================================================*/
#include <stdio.h>
#include <stdlib.h>
#include "ml6.h"
#include "display.h"
/*======== void plot() ==========
Inputs: screen s
color c
int x
int y
Returns:
Sets the color at pixel x, y to the color represented by c
Note that s[0][0] will be the upper left hand corner
of the screen.
If you wish to change this behavior, you can change the indicies
of s that get set. For example, using s[x][YRES-1-y] will have
pixel 0, 0 located at the lower left corner of the screen
02/12/10 09:09:00
jdyrlandweaver
====================*/
void plot( screen s, color c, int x, int y) {
s[x][y] = c;
}
/*======== void clear_screen() ==========
Inputs: screen s
Returns:
Sets every color in screen s to black
02/12/10 09:13:40
jdyrlandweaver
====================*/
void clear_screen( screen s ) {
int x, y;
color c;
c.red = 0;
c.green = 0;
c.blue = 0;
for ( y=0; y < YRES; y++ )
for ( x=0; x < XRES; x++)
s[x][y] = c;
}
/*======== void save_ppm() ==========
Inputs: screen s
char *file
Returns:
Saves screen s as a valid ppm file using the
settings in ml6.h
02/12/10 09:14:07
jdyrlandweaver
====================*/
void save_ppm( screen s, char *file) {
int x, y;
FILE *f;
f = fopen(file, "w");
fprintf(f, "P3\n%d %d\n%d\n", XRES, YRES, MAX_COLOR);
for ( y=0; y < YRES; y++ ) {
for ( x=0; x < XRES; x++)
fprintf(f, "%d %d %d ", s[x][y].red, s[x][y].green, s[x][y].blue);
fprintf(f, "\n");
}
fclose(f);
}
/*======== void save_extension() ==========
Inputs: screen s
char *file
Returns:
Saves the screen stored in s to the filename represented
by file.
If the extension for file is an image format supported
by the "convert" command, the image will be saved in
that format.
02/12/10 09:14:46
jdyrlandweaver
====================*/
void save_extension( screen s, char *file) {
int x, y;
FILE *f;
char line[256];
sprintf(line, "convert - %s", file);
f = popen(line, "w");
fprintf(f, "P3\n%d %d\n%d\n", XRES, YRES, MAX_COLOR);
for ( y=0; y < YRES; y++ ) {
for ( x=0; x < XRES; x++)
fprintf(f, "%d %d %d ", s[x][y].red, s[x][y].green, s[x][y].blue);
fprintf(f, "\n");
}
pclose(f);
}
/*======== void display() ==========
Inputs: screen s
Returns:
Will display the screen s on your monitor
02/12/10 09:16:30
jdyrlandweaver
====================*/
void display( screen s) {
int x, y;
FILE *f;
f = popen("display", "w");
fprintf(f, "P3\n%d %d\n%d\n", XRES, YRES, MAX_COLOR);
for ( y=0; y < YRES; y++ ) {
for ( x=0; x < XRES; x++)
fprintf(f, "%d %d %d ", s[x][y].red, s[x][y].green, s[x][y].blue);
fprintf(f, "\n");
}
pclose(f);
}