ResourceGraph: Keep the graph inside the GUI::Frame rect

Part of the graph was hidden under the frame rect, which had the effect
of delaying the appearance of spikes (well, all changes really.)

MenuApplets/ResourceGraph/main.cpp

@@ -48,6 +48,8 @@ class GraphWidget final : public GUI::Frame {
  C_OBJECT(GraphWidget);
 
 public:
+ static constexpr size_t history_size = 30;
+
  GraphWidget(GraphType graph_type, Optional<Gfx::Color> graph_color)
  : m_graph_type(graph_type)
  {
@@ -101,8 +103,8 @@ class GraphWidget final : public GUI::Frame {
  auto rect = frame_inner_rect();
  for (auto value : m_history) {
  painter.draw_line(
- { i, rect.bottom() },
- { i, (int)(rect.height() - (value * (float)rect.height())) },
+ { rect.x() + i, rect.bottom() },
+ { rect.x() + i, (int)(rect.height() - (value * (float)rect.height())) },
  m_graph_color);
  ++i;
  }
@@ -156,7 +158,7 @@ class GraphWidget final : public GUI::Frame {
 
  GraphType m_graph_type;
  Gfx::Color m_graph_color;
- CircularQueue<float, 30> m_history;
+ CircularQueue<float, history_size> m_history;
  unsigned m_last_cpu_busy { 0 };
  unsigned m_last_cpu_idle { 0 };
  String m_tooltip;
@@ -211,7 +213,7 @@ int main(int argc, char** argv)
  auto window = GUI::Window::construct();
  window->set_title(name);
  window->set_window_type(GUI::WindowType::MenuApplet);
- window->resize(30, 16);
+ window->resize(GraphWidget::history_size + 2, 16);
 
  window->set_main_widget<GraphWidget>(graph_type, graph_color);
  window->show();