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Track min & max coordinates
[batteryviewer] / 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 <float.h>
8 #include <gtk/gtk.h>
9
10 #define BV_CHART_PRIVATE(obj) \
11 (G_TYPE_INSTANCE_GET_PRIVATE((obj), BV_CHART_TYPE, BVChartPrivate))
12
13 typedef struct _BVChartPrivate BVChartPrivate;
14
15 struct _BVChartPrivate {
16 GArray *points;
17 float minx, miny, maxx, maxy;
18 };
19
20 struct BVChartPoint {
21 float x, y;
22 };
23
24 G_DEFINE_TYPE_WITH_CODE(BVChart, bv_chart, GTK_TYPE_DRAWING_AREA,
25 G_ADD_PRIVATE(BVChart))
26
27 static void bv_chart_class_init(BVChartClass *klass __attribute__((unused))) {}
28
29 static void bv_chart_init(BVChart *chart) {
30 gtk_widget_set_has_window(GTK_WIDGET(chart), FALSE);
31 BVChartPrivate *priv = bv_chart_get_instance_private(chart);
32 gboolean zero_terminated = FALSE;
33 gboolean clear_ = FALSE;
34 priv->points =
35 g_array_new(zero_terminated, clear_, sizeof(struct BVChartPoint));
36 priv->minx = FLT_MAX;
37 priv->miny = FLT_MAX;
38 priv->maxx = FLT_MIN;
39 priv->maxy = FLT_MIN;
40 }
41
42 GtkWidget *bv_chart_new() {
43 return GTK_WIDGET(g_object_new(bv_chart_get_type(), NULL));
44 }
45
46 void bv_chart_add_point(BVChart *chart, float x, float y) {
47 BVChartPrivate *priv = bv_chart_get_instance_private(chart);
48 if (x < priv->minx)
49 priv->minx = x;
50 if (y < priv->miny)
51 priv->miny = y;
52 if (x > priv->maxx)
53 priv->maxx = x;
54 if (y > priv->maxy)
55 priv->maxy = y;
56 struct BVChartPoint p = {.x = x, .y = y};
57 g_array_append_val(priv->points, p);
58 }