remake ps
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tovjemam
parent
5742e9af6b
commit
49598cfda3
6
main.c
6
main.c
@ -44,7 +44,7 @@ static int parse_range(const char *str, struct graph_range *range) {
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return 1;
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}
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static enum error_code export_to_file(const struct expr_node *node, const struct graph_range *range, const char *out_name) {
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static enum error_code export_to_file(const struct expr_node *node, const struct graph_range *range, const char *function, const char *out_name) {
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FILE *file;
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if (!(file = fopen(out_name, "w"))) {
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@ -52,7 +52,7 @@ static enum error_code export_to_file(const struct expr_node *node, const struct
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return ERR_INVALID_FILENAME;
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}
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ps_export_graph(file, node, range);
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ps_generate_graph(file, node, range, function);
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fclose(file);
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return ERR_NO_ERR;
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@ -104,7 +104,7 @@ int main(int argc, char *argv[]) {
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return parser_get_error(&parser);
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}
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err = export_to_file(node, &range, argv[2]);
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err = export_to_file(node, &range, argv[1], argv[2]);
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#ifdef ENABLE_GRAPHVIZ_EXPORT
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export_gv(node, "graph.dot");
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162
ps_graph.c
162
ps_graph.c
@ -1,18 +1,77 @@
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#include "ps_graph.h"
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#include <math.h>
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#define TEMP_BUF_SIZE 128
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/* rozměry grafu */
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#define GRAPH_SIZE 400
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#define HALF_GRAPH_SIZE (GRAPH_SIZE / 2)
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#define GRAPH_CENTER_X 306
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#define GRAPH_CENTER_Y 500
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/* písmo */
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#define FONT "Helvetica"
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#define FONT_SIZE_HEADER 15
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#define FONT_SIZE_LABEL 12
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#define FONT_SIZE_VALUE 9
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#define GRID_STEP (GRAPH_SIZE / 10)
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/* posuny popisků */
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#define HEADER_OFFSET_Y (10)
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#define X_VAL_OFFSET_X (0)
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#define X_VAL_OFFSET_Y (-13)
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#define Y_VAL_OFFSET_X (-5)
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#define Y_VAL_OFFSET_Y (-3)
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#define X_LABEL_OFFSET_X (0)
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#define X_LABEL_OFFSET_Y (-30)
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#define Y_LABEL_OFFSET_X (-40)
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#define Y_LABEL_OFFSET_Y (-3)
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/* počet částí grafu funkce */
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#define FUNCTION_SEGMENTS 1000
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void ps_export_graph(FILE *file, const struct expr_node *node, const struct graph_range *range) {
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int i;
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double x;
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int first = 1;
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/* koeficienty pro zarovnání textu */
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#define ALIGN_CENTER (-0.5)
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#define ALIGN_RIGHT (-1.0)
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static void generate_text_align(FILE *file, int x, int y, double alignment, const char *str) {
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fprintf(file,
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"newpath\n"
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/* posun na cílovou pozici */
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"%d %d moveto\n"
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/* vložení dvou řetězců s popiskem */
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"(%s) dup\n"
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/* zjištění šířky a výšky řetežce, odstranění výšky ze zásobníku (nezajímá) */
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"stringwidth pop\n"
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/* koeficient pro zarovnání */
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"%f mul\n"
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/* posun o šířku doleva */
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"0 rmoveto\n"
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/* zobrazení řetězce */
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"show\n"
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"\n",
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x, y, str, alignment
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);
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}
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static void set_font(FILE *file, const char *font, int size) {
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fprintf(file,
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"/%s findfont\n"
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"%d scalefont\n"
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"setfont\n",
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font, size
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);
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}
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static void generate_grid(FILE *file, const struct graph_range *range) {
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int i;
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fprintf(file,
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"306 500 translate\n"
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"2 setlinewidth\n"
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"/gridline {\n"
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" .5 setlinewidth\n"
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@ -26,62 +85,38 @@ void ps_export_graph(FILE *file, const struct expr_node *node, const struct grap
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"\n"
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);
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/* mrizka */
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for (i = -HALF_GRAPH_SIZE + GRID_STEP; i < HALF_GRAPH_SIZE; i += GRID_STEP) {
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fprintf(file, "%5d 0 %5d %5d gridline\n", GRAPH_SIZE, -HALF_GRAPH_SIZE, i);
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fprintf(file, " 0 %5d %5d %5d gridline\n", GRAPH_SIZE, i, -HALF_GRAPH_SIZE);
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}
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/* popisky */
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fprintf(file,
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"/Arial findfont\n"
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"10 scalefont\n"
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"setfont\n"
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);
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set_font(file, FONT, FONT_SIZE_VALUE);
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/* hodnoty */
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for (i = -HALF_GRAPH_SIZE; i <= HALF_GRAPH_SIZE; i += GRID_STEP) {
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double inorm = (double)i / (double)GRAPH_SIZE + 0.5;
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double xval = range->xmax * inorm + range->xmin * (1.0 - inorm);
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double yval = range->ymax * inorm + range->ymin * (1.0 - inorm);
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fprintf(file,
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"newpath\n"
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"%d %d moveto\n"
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"(%.2f) dup\n"
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"stringwidth pop neg\n"
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"0 rmoveto\n"
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"-10 -3 rmoveto\n"
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"show\n"
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"\n",
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-HALF_GRAPH_SIZE, i, yval
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);
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char buf[TEMP_BUF_SIZE];
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fprintf(file,
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"newpath\n"
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"%d %d moveto\n"
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"(%.2f) dup\n"
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"stringwidth pop\n"
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"2 div neg\n"
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"-20 rmoveto\n"
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"show\n"
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"\n",
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i, -HALF_GRAPH_SIZE, xval
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);
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/* hodnota osy y */
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snprintf(buf, TEMP_BUF_SIZE, "%.2f", yval);
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generate_text_align(file, -HALF_GRAPH_SIZE + Y_VAL_OFFSET_X, i + Y_VAL_OFFSET_Y, ALIGN_RIGHT, buf);
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/* hodnota osy x */
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snprintf(buf, TEMP_BUF_SIZE, "%.2f", xval);
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generate_text_align(file, i + X_VAL_OFFSET_X, -HALF_GRAPH_SIZE + X_VAL_OFFSET_Y, ALIGN_CENTER, buf);
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}
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fprintf(file,
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"[] 0 setdash\n"
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"newpath\n"
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"%d %d moveto\n"
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"%d 0 rlineto\n"
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"0 %d rlineto\n"
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"%d 0 rlineto\n"
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"closepath\n"
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"gsave\n"
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"clip\n",
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-HALF_GRAPH_SIZE, -HALF_GRAPH_SIZE, GRAPH_SIZE, GRAPH_SIZE, -GRAPH_SIZE
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);
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set_font(file, FONT, FONT_SIZE_LABEL);
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generate_text_align(file, -HALF_GRAPH_SIZE + Y_LABEL_OFFSET_X, Y_LABEL_OFFSET_Y, ALIGN_RIGHT, "y");
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generate_text_align(file, X_LABEL_OFFSET_X, -HALF_GRAPH_SIZE + X_LABEL_OFFSET_Y, ALIGN_CENTER, "x");
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}
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static void generate_function(FILE *file, const struct expr_node *node, const struct graph_range *range) {
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int i;
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int first = 1;
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fprintf(file,
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"2 setlinewidth\n"
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@ -92,7 +127,7 @@ void ps_export_graph(FILE *file, const struct expr_node *node, const struct grap
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for (i = 0; i < FUNCTION_SEGMENTS; ++i) {
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const char *cmd = "lineto";
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double xpos, ypos;
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double y;
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double x, y;
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x = range->xmin + (range->xmax - range->xmin) * (double)i / (double)FUNCTION_SEGMENTS;
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@ -115,6 +150,35 @@ void ps_export_graph(FILE *file, const struct expr_node *node, const struct grap
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fprintf(file,
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"stroke\n"
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);
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}
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void ps_generate_graph(FILE *file, const struct expr_node *node, const struct graph_range *range, const char *function) {
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char buf[TEMP_BUF_SIZE];
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fprintf(file, "%d %d translate\n", GRAPH_CENTER_X, GRAPH_CENTER_Y);
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if (function) {
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set_font(file, FONT, FONT_SIZE_HEADER);
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snprintf(buf, TEMP_BUF_SIZE, "y = %s", function);
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generate_text_align(file, 0, HALF_GRAPH_SIZE + HEADER_OFFSET_Y, ALIGN_CENTER, buf);
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}
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generate_grid(file, range);
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fprintf(file,
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"[] 0 setdash\n"
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"newpath\n"
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"%d %d moveto\n"
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"%d 0 rlineto\n"
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"0 %d rlineto\n"
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"%d 0 rlineto\n"
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"closepath\n"
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"gsave\n"
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"clip\n",
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-HALF_GRAPH_SIZE, -HALF_GRAPH_SIZE, GRAPH_SIZE, GRAPH_SIZE, -GRAPH_SIZE
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);
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generate_function(file, node, range);
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fprintf(file,
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"grestore\n"
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@ -122,6 +186,4 @@ void ps_export_graph(FILE *file, const struct expr_node *node, const struct grap
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"0 0 0 setrgbcolor\n"
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"stroke\n"
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);
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}
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@ -9,6 +9,6 @@ struct graph_range {
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double ymin, ymax;
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};
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extern void ps_export_graph(FILE *file, const struct expr_node *node, const struct graph_range *range);
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extern void ps_generate_graph(FILE *file, const struct expr_node *node, const struct graph_range *range, const char *function);
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#endif
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