git.scottworley.com Git - batteryviewer/blob - chart.c

   1 /*
   2  * h/t https://ptomato.name/advanced-gtk-techniques/html/custom-container.html
   3  * for examples of how to make GTK widgets
   4  */
   5
   6 #include "chart.h"
   7 #include <gtk/gtk.h>
   8
   9 #define BV_CHART_PRIVATE(obj)                                                  \
  10   (G_TYPE_INSTANCE_GET_PRIVATE((obj), BV_CHART_TYPE, BVChartPrivate))
  11
  12 typedef struct _BVChartPrivate BVChartPrivate;
  13
  14 struct _BVChartPrivate {
  15   GArray *points;
  16 };
  17
  18 struct BVChartPoint {
  19   float x, y;
  20 };
  21
  22 G_DEFINE_TYPE_WITH_CODE(BVChart, bv_chart, GTK_TYPE_DRAWING_AREA,
  23                         G_ADD_PRIVATE(BVChart))
  24
  25 static void bv_chart_class_init(BVChartClass *klass __attribute__((unused))) {}
  26
  27 static void bv_chart_init(BVChart *chart) {
  28   gtk_widget_set_has_window(GTK_WIDGET(chart), FALSE);
  29   BVChartPrivate *priv = bv_chart_get_instance_private(chart);
  30   gboolean zero_terminated = FALSE;
  31   gboolean clear_ = FALSE;
  32   priv->points =
  33       g_array_new(zero_terminated, clear_, sizeof(struct BVChartPoint));
  34 }
  35
  36 GtkWidget *bv_chart_new() {
  37   return GTK_WIDGET(g_object_new(bv_chart_get_type(), NULL));
  38 }
  39
  40 void bv_chart_add_point(BVChart *chart, float x, float y) {
  41   BVChartPrivate *priv = bv_chart_get_instance_private(chart);
  42   struct BVChartPoint p = {.x = x, .y = y};
  43   g_array_append_val(priv->points, p);
  44 }