MySQL Building User Interfaces

Report 3: Bar/Line Chart

Listing 12.8 is the source for barline_utils.c, the code functions that are called from callbacks.c (for the third report) to create the bar/line chart.

Listing 12.8. barline_utils.c

#include <gtk/gtk.h> #include <mysql.h> /* stdlib.h is needed for the atoi/atof call. */ #include <stdlib.h> #include "support.h" #define SERVER "einstein" #define LOGIN "kbi_user" #define PASS "dengissa" #define DB "kbi" #define BASELINE_CHART 350 //the number of pixels from the top //of the drawingarea to the "baseline" //of the bars in the bar graph #define BASELINE_MONTHS 370 //the number of pixels down to draw //the month names #define SCALE_DENOMINATOR 1235 //the division factor to scale the bars //and lines to the drawingarea #define ...