/* * h/t https://ptomato.name/advanced-gtk-techniques/html/custom-container.html * for examples of how to make GTK widgets */ #include "chart.h" #include #include #define BV_CHART_PRIVATE(obj) \ (G_TYPE_INSTANCE_GET_PRIVATE((obj), BV_CHART_TYPE, BVChartPrivate)) typedef struct _BVChartPrivate BVChartPrivate; struct _BVChartPrivate { GArray *points; float minx, miny, maxx, maxy; }; struct BVChartPoint { float x, y; }; G_DEFINE_TYPE_WITH_CODE(BVChart, bv_chart, GTK_TYPE_DRAWING_AREA, G_ADD_PRIVATE(BVChart)) static void bv_chart_class_init(BVChartClass *klass __attribute__((unused))) {} static void bv_chart_init(BVChart *chart) { gtk_widget_set_has_window(GTK_WIDGET(chart), FALSE); BVChartPrivate *priv = bv_chart_get_instance_private(chart); gboolean zero_terminated = FALSE; gboolean clear_ = FALSE; priv->points = g_array_new(zero_terminated, clear_, sizeof(struct BVChartPoint)); priv->minx = FLT_MAX; priv->miny = FLT_MAX; priv->maxx = FLT_MIN; priv->maxy = FLT_MIN; } GtkWidget *bv_chart_new() { return GTK_WIDGET(g_object_new(bv_chart_get_type(), NULL)); } void bv_chart_add_point(BVChart *chart, float x, float y) { BVChartPrivate *priv = bv_chart_get_instance_private(chart); if (x < priv->minx) priv->minx = x; if (y < priv->miny) priv->miny = y; if (x > priv->maxx) priv->maxx = x; if (y > priv->maxy) priv->maxy = y; struct BVChartPoint p = {.x = x, .y = y}; g_array_append_val(priv->points, p); }