247 lines
8.3 KiB
C
247 lines
8.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <math.h>
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#include <gd.h>
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#include "../definitions.h"
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#include "image_draw.h"
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#include "image_data.h"
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#include "image_common.h"
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#define SHORTBUFFSIZE 64
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typedef int color;
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typedef struct dimension {
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int width;
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int height;
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int l_t_x;
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int l_t_y;
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int l_b_x;
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int l_b_y;
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int r_b_x;
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int r_b_y;
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int r_t_x;
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int r_t_y;
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int to_base;
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} dimension_t;
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static gdImagePtr create_image();
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static gdImagePtr draw_image(gdImagePtr);
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static dimension_t calc_text_dim(char *, double , double );
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static color alloc_alpha_color(gdImagePtr , img_color_ptr );
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static void write_image_png(gdImagePtr, FILE *);
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/* Baut ein Bild und schreibt es in die Datei */
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int draw_to_file(FILE *fd){
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gdImagePtr img = create_image();
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draw_image(img);
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write_image_png(img, fd);
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gdImageDestroy(img);
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}
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/* Erstellt ein Bild mit Hintergrundfarbe */
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static gdImagePtr create_image(){
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gdImagePtr new_img = NULL;
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color back;
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new_img = gdImageCreateTrueColor(img_cfg.width, img_cfg.height);
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gdImageAlphaBlending(new_img, 0);
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back = alloc_alpha_color(new_img, img_cfg.bg_color);
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gdImageFilledRectangle(new_img, 0,0,img_cfg.width, img_cfg.height, back);
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gdImageAlphaBlending(new_img, 1);
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return new_img;
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}
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/* Baut das Bild */
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static gdImagePtr draw_image(gdImagePtr img){
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/* Werte und Labels */
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pix_list_ptr pix_list = NULL;
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label_list_ptr x_labels = NULL;
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label_list_ptr y_labels = NULL;
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/* Allgemeine Variablen */
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int max_val = 0;
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int min_val = 0;
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int offset_x_left = 0;
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int offset_y_top = 5;
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int offset_x_right = 20;
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int offset_y_bottom = 0;
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int dia_width = 0;
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int dia_height = 0;
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int zero_line = 0;
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int dia_y_padding = 10;
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int brect[8];
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int y_label_max_width = 0;
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int i;
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char *buff;
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time_t ts;
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/* Größenangaben fuer die einzelnen Texte */
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dimension_t head_d;
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dimension_t y_label_d;
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dimension_t x_label_d;
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dimension_t x_desc_d;
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dimension_t y_desc_d;
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/* Farben */
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color val_line_c = alloc_alpha_color(img, img_cfg.dia_line_color);
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color zero_line_c = alloc_alpha_color(img, img_cfg.zero_line_color);
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color dia_bg_c = alloc_alpha_color(img, img_cfg.dia_bg_color);
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color diag_grid_x_c = alloc_alpha_color(img, img_cfg.dia_grid_x_color);
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color diag_grid_y_c = alloc_alpha_color(img, img_cfg.dia_grid_y_color);
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color dia_border_c = alloc_alpha_color(img, img_cfg.dia_border_color);
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color headline_c = alloc_alpha_color(img, img_cfg.headline_color);
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color label_x_c = alloc_alpha_color(img, img_cfg.label_x_color);
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color label_xl_c = alloc_alpha_color(img, img_cfg.label_extra_x_color);
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color label_y_c = alloc_alpha_color(img, img_cfg.label_y_color);
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color desc_x_c = alloc_alpha_color(img, img_cfg.desc_x_color);
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color desc_y_c = alloc_alpha_color(img, img_cfg.desc_y_color);
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/* Ueberschrift */
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head_d = calc_text_dim(img_cfg.headline, 16, 0);
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gdImageStringFT(img, &brect[0], headline_c, IMG_FONT, 16, 0, 10, offset_y_top + head_d.to_base, img_cfg.headline);
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offset_y_top = (offset_y_top * 2) + head_d.height;
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/* Einrueckung von links berechnen */
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if(img_cfg.unit != NULL){
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buff = malloc(sizeof(char)*SHORTBUFFSIZE);
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snprintf(buff, SHORTBUFFSIZE, "99999%s", img_cfg.unit);
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y_label_d = calc_text_dim(buff, 7, 0);
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free(buff);
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} else {
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y_label_d = calc_text_dim("99999", 7, 0);
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}
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y_label_max_width = y_label_d.width;
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y_desc_d = calc_text_dim(img_cfg.y_desc, 9, 1.57079);
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offset_x_left = offset_x_left + y_label_max_width + 15 + (y_desc_d.r_b_x - y_desc_d.r_t_x);
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dia_width = img_cfg.width - offset_x_left - offset_x_right;
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/* Diagramhöhe */
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buff = malloc(sizeof(char)*SHORTBUFFSIZE);
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ts = time(NULL);
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strftime(buff, SHORTBUFFSIZE, "%d.%m.%y\r\n%H:%M", localtime(&ts) ) ;
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x_label_d = calc_text_dim(buff, 8, 1.0);
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x_desc_d = calc_text_dim(img_cfg.x_desc, 9, 0);
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offset_y_bottom = 10 + fabs(x_label_d.height) + x_desc_d.height;
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dia_height = img_cfg.height - offset_y_top - offset_y_bottom ;
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free(buff);
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/* Beschriftung y-, x-Achse */
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gdImageStringFT(img, &brect[0], desc_y_c, IMG_FONT, 9, 1.57079, 5 + ((y_desc_d.r_b_x - y_desc_d.r_t_x) / 2), offset_y_top + (dia_height / 2) + ((y_desc_d.l_t_y - y_desc_d.r_t_y) / 2), img_cfg.y_desc);
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gdImageStringFT(img, &brect[0], desc_x_c, IMG_FONT, 9, 0 , (offset_x_left + (dia_width / 2)) - (x_desc_d.width / 2), (img_cfg.height - 5) - x_desc_d.l_b_y, img_cfg.x_desc);
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/* Werte holen */
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pix_list = get_pix_list(dia_width);
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/* Diagramhintergrund */
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gdImageFilledRectangle(img, offset_x_left, offset_y_top, img_cfg.width - offset_x_right, img_cfg.height - offset_y_bottom, dia_bg_c);
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/* horizontale linien + y - Labels */
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y_labels = get_y_label_list(dia_height, dia_y_padding, 0);
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for (; y_labels; y_labels = y_labels->next){
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gdImageLine(img, offset_x_left - 2, offset_y_top + y_labels->pos, img_cfg.width - offset_x_right, offset_y_top + y_labels->pos, diag_grid_x_c);
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y_label_d = calc_text_dim(y_labels->text, 7, 0);
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gdImageStringFT(img, &brect[0], label_y_c, IMG_FONT, 7, 0, (offset_x_left - 5 - y_label_max_width) + (y_label_max_width - y_label_d.width), offset_y_top + y_labels->pos + (y_label_d.height / 2), y_labels->text);
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}
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/* y-Werte skalieren */
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zero_line = scale_y_coords(pix_list, dia_height);
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/* Vertikale linien + x - Labels*/
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x_labels = get_x_label_list(dia_width);
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for(; x_labels; x_labels = x_labels->next){
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gdImageLine(img, offset_x_left + x_labels->pos, offset_y_top, offset_x_left + x_labels->pos, img_cfg.height - offset_y_bottom + 2, diag_grid_y_c);
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x_label_d = calc_text_dim(x_labels->text, 7, 1.0);
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gdImageStringFT(img, &brect[0], label_x_c, IMG_FONT, 7, 1.0, (offset_x_left + x_labels->pos) - ( x_label_d.r_t_x + ((x_label_d.r_b_x - x_label_d.r_t_x) / 2)), (img_cfg.height - offset_y_bottom + 5) - (x_label_d.r_t_y), x_labels->text);
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}
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x_label_d = calc_text_dim(get_min_time(), 8, 1.0);
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gdImageStringFT(img, &brect[0], label_xl_c, IMG_FONT, 8, 1.0, (offset_x_left ) - ( x_label_d.r_t_x + ((x_label_d.r_b_x - x_label_d.r_t_x) / 2)), (img_cfg.height - offset_y_bottom + 5) - (x_label_d.r_t_y), get_min_time() );
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x_label_d = calc_text_dim(get_max_time(), 8, 1.0);
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gdImageStringFT(img, &brect[0], label_xl_c, IMG_FONT, 8, 1.0, (offset_x_left + dia_width) - ( x_label_d.r_t_x + ((x_label_d.r_b_x - x_label_d.r_t_x) / 2)), (img_cfg.height - offset_y_bottom + 5) - (x_label_d.r_t_y), get_max_time() );
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/* Nullinie */
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if (zero_line != -1)
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gdImageLine(img, offset_x_left, zero_line + offset_y_top, img_cfg.width - offset_x_right, zero_line + offset_y_top, zero_line_c);
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/* Werte Zeichnen */
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for (; pix_list->next; pix_list = pix_list->next){
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gdImageLine(img, (offset_x_left + pix_list->x_pix_coord), (offset_y_top + pix_list->y_pix_coord), (offset_x_left + pix_list->next->x_pix_coord), (offset_y_top + pix_list->next->y_pix_coord), val_line_c);
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}
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/* Rahmen */
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gdImageRectangle(img, offset_x_left, offset_y_top, img_cfg.width - offset_x_right, img_cfg.height - offset_y_bottom, dia_border_c);
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}
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static dimension_t calc_text_dim(char *text, double size, double angle){
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int brect[8];
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dimension_t dim;
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int x_rt_lb = 0;
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int x_rb_lt = 0;
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int y_rt_lb = 0;
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int y_rb_lt = 0;
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gdImageStringFT(NULL, &brect[0], 0, IMG_FONT, size, angle, 0,0, text);
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dim.l_t_x = brect[6];
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dim.l_t_y = brect[7];
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dim.l_b_x = brect[0];
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dim.l_b_y = brect[1];
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dim.r_b_x = brect[2];
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dim.r_b_y = brect[3];
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dim.r_t_x = brect[4];
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dim.r_t_y = brect[5];
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dim.to_base = 0 - dim.r_t_y;
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x_rt_lb = dim.r_t_x - dim.l_b_x;
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x_rb_lt = dim.r_b_x - dim.l_t_x;
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y_rt_lb = dim.l_b_y - dim.r_t_y;
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y_rb_lt = dim.r_b_y - dim.l_t_y;
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if(x_rt_lb < x_rb_lt){
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dim.width = x_rb_lt;
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} else {
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dim.width = x_rt_lb;
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}
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if(y_rt_lb < y_rb_lt){
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dim.height = y_rb_lt;
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//printf("y_rb_lt");
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} else {
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dim.height = y_rt_lb;
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//printf("y_rt_lb");
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}
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//printf("%d -- %s\n", dim.height, text);
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return dim;
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}
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/* Eine Farbe mit alphawert holen */
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static color alloc_alpha_color(gdImagePtr img, img_color_ptr ptr){
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return gdImageColorAllocateAlpha(img, ptr->r, ptr->g, ptr->b, ptr->alpha);
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}
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/* Schreibt das Bild in eine Datei */
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static void write_image_png(gdImagePtr img, FILE *fd){
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gdImageAlphaBlending(img, 0);
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gdImageSaveAlpha(img, 1);
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gdImagePng(img, fd);
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}
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