104 lines
3.0 KiB
C
104 lines
3.0 KiB
C
#include <stdio.h>
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#include <gd.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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typedef int color;
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static gdImagePtr create_image();
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static gdImagePtr draw_image(gdImagePtr);
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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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}
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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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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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int max_val = 0;
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int min_val = 0;
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int offset_x_left = 20;
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int offset_y_top = 20;
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int offset_x_right = 20;
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int offset_y_bottom = 20;
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int dia_width = img_cfg.width - offset_x_left - offset_x_right;
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int dia_height = img_cfg.height - offset_y_top - offset_y_bottom;
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int zero_line = 0;
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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_c = alloc_alpha_color(img, img_cfg.dia_grid_color);
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/* Werte holen */
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pix_list = get_pix_list(dia_width);
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/* y-Werte skalieren */
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zero_line = scale_y_coords(pix_list, dia_height, 400, -100);
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x_labels = get_x_label_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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/* Vertikale linien + x - Labels*/
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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, diag_grid_c);
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}
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/* Nullinie */
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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), (zero_line + offset_y_top + pix_list->y_pix_coord), (offset_x_left + pix_list->next->x_pix_coord), (zero_line + offset_y_top + pix_list->next->y_pix_coord), val_line_c);
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}
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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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