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drawbar.c
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drawbar.c
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/*
* Copyright (c) 2018 Yannick Garcia <thaddeus.dupont@free.fr>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GPL license. See file LICENSE for details.
*/
/**
* \file drawbar.c
* \brief main program file for drawbar.
*
* Drawbar is a command line program to create an image of a progressbar.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "yImage.h"
#include "yImage_io.h"
#include "yText.h"
#ifndef INSTALL_DIR
/* the prefix assets installation */
#define INSTALL_DIR "/usr"
#endif
// input images
#define BACK "empty.png"
#define FIRST "first.png"
#define NORMAL "normal.png"
#define LAST "last.png"
#define X_OFFSET 13
#define Y_OFFSET 3
#define BAR_LENGHT 200
// generated file
#define OUTPUT "progressbar.png"
/**
* The usage function.
* \param prog the program's name.
*/
void usage(char *prog) {
fprintf(stderr, "\nCreate a progressbar.\n");
fprintf(stderr, "Usage: %s <number> <total>\n\n", prog);
exit(1);
}
/**
* Draw on the bar to show the given index is reached.
*/
void progress_to(int index, yImage *bar, yImage *first, yImage *normal, yImage *last) {
yImage *progress = normal;
if(index == 0) {
progress = first;
}
if(index == BAR_LENGHT) {
progress = last;
}
if(progress != NULL) {
y_superpose_images(bar, progress, X_OFFSET + index, Y_OFFSET);
}
}
yImage *read_file(const char *filename) {
yImage *im;
char *fullname = malloc(sizeof(char) * (strlen(filename) + strlen(INSTALL_DIR) + 20));
sprintf(fullname, "%s/share/drawbar/%s", INSTALL_DIR, filename);
im = y_load_png(fullname);
if(im == NULL) {
fprintf(stderr, "Could not read %s\n", fullname);
}
free(fullname);
return im;
}
/**
* Create the output image.
* \param rate the progression to show
* \return The created image or NULL
*/
yImage *create_bar(float rate) {
yImage *bar, *first, *normal, *last;
int err;
int position;
int i;
bar = read_file(BACK);
if(bar == NULL) {
return NULL;
}
first = read_file(FIRST);
normal = read_file(NORMAL);
last = read_file(LAST);
position = (int) (rate * BAR_LENGHT);
for(i=0; i<position; i++) {
progress_to(i, bar, first, normal, last);
}
return bar;
}
/**
* \return the number of characters needed to write the given number
*/
int number_char(int value) {
int i = 0;
if(value==0) return 1;
while(value>0) {
i++;
value = value / 10;
}
return i;
}
/**
* Create the text to illustrate the progressbar.
*/
yImage *create_text(int n, int t, int height) {
yImage *textImage;
int nb = 0; // the number of caracters to write
int err;
char text[100];
nb = number_char(n) + number_char(t) + 3;
textImage = y_create_image(&err, NULL, nb*9+18, height);
if(err) return NULL;
y_transp(textImage);
sprintf(text, " %d/%d", n, t);
y_display_text(textImage, 0, (height-12) / 2, text);
return textImage;
}
yImage *concat(yImage *bar, yImage *text){
int l, h;
yImage *image;
int err;
int x = 0;
l = 0;
h = 0;
if(bar != NULL) {
h = bar->rgbHeight;
l += bar->rgbWidth;
}
if(text != NULL) {
if(text->rgbHeight > h) {
h = text->rgbHeight;
}
l += text->rgbWidth;
}
if(l==0 || h==0) {
return NULL;
}
image = y_create_image(&err, NULL, l, h);
if(err) return NULL;
y_transp(image);
if(bar != NULL) {
y_superpose_images(image, bar, x, 0);
x+=bar->rgbWidth;
}
if(text != NULL) {
y_superpose_images(image, text, x, 0);
}
return image;
}
/**
* Take two integer as parameters :
* A number n and a total t, the progress bar will show n/t.
*/
int main(int argc, char **argv) {
int n, t;
float rate; // n/t
yImage *bar;
yImage *textImage;
int height = 20;
yImage *progressBar;
int err = -1;
if(argc < 3) {
usage(argv[0]);
}
n=atoi(argv[1]);
t=atoi(argv[2]);
rate=(float) n/t;
bar = create_bar(rate);
if(bar!=NULL) {
height = bar->rgbHeight;
}
textImage = create_text(n, t, height);
progressBar = concat(bar, textImage);
y_destroy_image(bar);
y_destroy_image(textImage);
if(progressBar != NULL) {
err = y_save_png(progressBar, OUTPUT);
y_destroy_image(progressBar);
}
return err;
}