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komentare k ps_graph

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det-fys 2024-12-30 19:09:04 +01:00
parent d0b5599c8f
commit 1fb0614af4
1 changed files with 7 additions and 0 deletions
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7
ps_graph.c
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@ -109,6 +109,7 @@ static void generate_grid(FILE *file, const struct graph_range *range) {
} }
/* popisky os */
set_font(file, FONT, FONT_SIZE_LABEL); set_font(file, FONT, FONT_SIZE_LABEL);
generate_text_align(file, -HALF_GRAPH_SIZE + Y_LABEL_OFFSET_X, Y_LABEL_OFFSET_Y, ALIGN_RIGHT, "y"); generate_text_align(file, -HALF_GRAPH_SIZE + Y_LABEL_OFFSET_X, Y_LABEL_OFFSET_Y, ALIGN_RIGHT, "y");
generate_text_align(file, X_LABEL_OFFSET_X, -HALF_GRAPH_SIZE + X_LABEL_OFFSET_Y, ALIGN_CENTER, "x"); generate_text_align(file, X_LABEL_OFFSET_X, -HALF_GRAPH_SIZE + X_LABEL_OFFSET_Y, ALIGN_CENTER, "x");
@ -131,6 +132,7 @@ static void generate_function(FILE *file, const struct expr_node *node, const st
x = range->xmin + (range->xmax - range->xmin) * (double)i / (double)FUNCTION_SEGMENTS; x = range->xmin + (range->xmax - range->xmin) * (double)i / (double)FUNCTION_SEGMENTS;
/* funkce není definována */
if (node_eval(node, x, &y) != EVAL_OK) { if (node_eval(node, x, &y) != EVAL_OK) {
first = 1; first = 1;
continue; continue;
@ -155,8 +157,10 @@ static void generate_function(FILE *file, const struct expr_node *node, const st
void ps_generate_graph(FILE *file, const struct expr_node *node, const struct graph_range *range, const char *function) { void ps_generate_graph(FILE *file, const struct expr_node *node, const struct graph_range *range, const char *function) {
char buf[TEMP_BUF_SIZE]; char buf[TEMP_BUF_SIZE];
/* posun na střed */
fprintf(file, "%d %d translate\n", GRAPH_CENTER_X, GRAPH_CENTER_Y); fprintf(file, "%d %d translate\n", GRAPH_CENTER_X, GRAPH_CENTER_Y);
/* hlavička */
if (function) { if (function) {
set_font(file, FONT, FONT_SIZE_HEADER); set_font(file, FONT, FONT_SIZE_HEADER);
snprintf(buf, TEMP_BUF_SIZE, "y = %s", function); snprintf(buf, TEMP_BUF_SIZE, "y = %s", function);
@ -165,6 +169,7 @@ void ps_generate_graph(FILE *file, const struct expr_node *node, const struct gr
generate_grid(file, range); generate_grid(file, range);
/* ořezová oblast pro graf */
fprintf(file, fprintf(file,
"[] 0 setdash\n" "[] 0 setdash\n"
"newpath\n" "newpath\n"
@ -178,8 +183,10 @@ void ps_generate_graph(FILE *file, const struct expr_node *node, const struct gr
-HALF_GRAPH_SIZE, -HALF_GRAPH_SIZE, GRAPH_SIZE, GRAPH_SIZE, -GRAPH_SIZE -HALF_GRAPH_SIZE, -HALF_GRAPH_SIZE, GRAPH_SIZE, GRAPH_SIZE, -GRAPH_SIZE
); );
/* samotný graf */
generate_function(file, node, range); generate_function(file, node, range);
/* rámeček */
fprintf(file, fprintf(file,
"grestore\n" "grestore\n"
"2 setlinewidth\n" "2 setlinewidth\n"