Feature: Basic Text Tool for Canvas Annotation

[josefdc]

Description:
The application currently focuses on freehand drawing and geometric shapes. Adding a basic text tool would allow users to annotate their drawings, add titles, or incorporate textual elements into their artwork directly on the canvas.

Acceptance Criteria:

• A new "Text Tool" (e.g., with an "T" icon or label) is added to the Controls panel.
• When the Text Tool is selected:
  • Clicking on the canvas sets the starting position for the text.
  • The application enters a text input mode (similar to the AI prompt input, but rendering directly on the canvas or a temporary input box at the click position).
  • User can type text. Pressing Enter finalizes the text and renders it onto the main Canvas at the chosen position using the currently selected draw_color.
  • Pressing Escape during text input cancels the operation.
• (Bonus) A small, predefined set of font sizes (e.g., Small, Medium, Large) can be selected, perhaps via additional UI elements or keyboard modifiers when the text tool is active. Default font is acceptable.
• The text should be rendered onto the self.canvas.surface.

Possible Implementation Approach (Hints):

• Add a new tool identifier (e.g., "text_tool") and button in Controls.
• In Application._handle_events():
  • When the Text Tool is active and the user clicks on the canvas, store the click position (text_start_pos) and enter a new state (e.g., is_typing_on_canvas = True).
  • Capture pygame.KEYDOWN events to build the text string (similar to current_prompt_text).
  • In Application._render(), if is_typing_on_canvas, display the currently typed text at text_start_pos (or a small input box area).
  • When Enter is pressed:
    • Use pygame.font.Font to create a font object (e.g., self.ui_font_normal).
    • Render the text: text_surface = font.render(typed_text, True, self.draw_color).
    • Blit this text_surface onto self.canvas.surface at text_start_pos.
    • Exit is_typing_on_canvas state.
• Consider how to handle multi-line text (e.g., Enter finalizes, or implement basic wrapping/newlines if feeling ambitious). For a first version, single-line text is fine.