Source code for evennia.contrib.rpg.health_bar.health_bar

"""
Health Bar

Contrib - Tim Ashley Jenkins 2017

The function provided in this module lets you easily display visual
bars or meters - "health bar" is merely the most obvious use for this,
though these bars are highly customizable and can be used for any sort
of appropriate data besides player health.

Today's players may be more used to seeing statistics like health,
stamina, magic, and etc. displayed as bars rather than bare numerical
values, so using this module to present this data this way may make it
more accessible. Keep in mind, however, that players may also be using
a screen reader to connect to your game, which will not be able to
represent the colors of the bar in any way. By default, the values
represented are rendered as text inside the bar which can be read by
screen readers.

The health bar will account for current values above the maximum or
below 0, rendering them as a completely full or empty bar with the
values displayed within.

No installation, just import and use `display_meter` from this
module:

```python
    from evennia.contrib.rpg.health_bar import display_meter

    health_bar = display_meter(23, 100)
    caller.msg(prompt=health_bar)
```

"""


[docs]def display_meter( cur_value, max_value, length=30, fill_color=["R", "Y", "G"], empty_color="B", text_color="w", align="left", pre_text="", post_text="", show_values=True, ): """ Represents a current and maximum value given as a "bar" rendered with ANSI or xterm256 background colors. Args: cur_value (int): Current value to display max_value (int): Maximum value to display Keyword Arguments: length (int): Length of meter returned, in characters fill_color (list): List of color codes for the full portion of the bar, sans any sort of prefix - both ANSI and xterm256 colors are usable. When the bar is empty, colors toward the start of the list will be chosen - when the bar is full, colors towards the end are picked. You can adjust the 'weights' of the changing colors by adding multiple entries of the same color - for example, if you only want the bar to change when it's close to empty, you could supply ['R','Y','G','G','G'] empty_color (str): Color code for the empty portion of the bar. text_color (str): Color code for text inside the bar. align (str): "left", "right", or "center" - alignment of text in the bar pre_text (str): Text to put before the numbers in the bar post_text (str): Text to put after the numbers in the bar show_values (bool): If true, shows the numerical values represented by the bar. It's highly recommended you keep this on, especially if there's no info given in pre_text or post_text, as players on screen readers will be unable to read the graphical aspect of the bar. Returns: str: The display bar to show. """ # Start by building the base string. num_text = "" if show_values: num_text = "%i / %i" % (cur_value, max_value) bar_base_str = pre_text + num_text + post_text # Cut down the length of the base string if needed if len(bar_base_str) > length: bar_base_str = bar_base_str[:length] # Pad and align the bar base string if align == "right": bar_base_str = bar_base_str.rjust(length, " ") elif align == "center": bar_base_str = bar_base_str.center(length, " ") else: bar_base_str = bar_base_str.ljust(length, " ") if max_value < 1: # Prevent divide by zero max_value = 1 if cur_value < 0: # Prevent weirdly formatted 'negative bars' cur_value = 0 if cur_value > max_value: # Display overfull bars correctly cur_value = max_value # Now it's time to determine where to put the color codes. percent_full = float(cur_value) / float(max_value) split_index = round(float(length) * percent_full) # Determine point at which to split the bar split_index = int(split_index) # Separate the bar string into full and empty portions full_portion = bar_base_str[:split_index] empty_portion = bar_base_str[split_index:] # Pick which fill color to use based on how full the bar is fillcolor_index = float(len(fill_color)) * percent_full fillcolor_index = max(0, int(round(fillcolor_index)) - 1) fillcolor_code = "|[" + fill_color[fillcolor_index] # Make color codes for empty bar portion and text_color emptycolor_code = "|[" + empty_color textcolor_code = "|" + text_color # Assemble the final bar final_bar = ( fillcolor_code + textcolor_code + full_portion + "|n" + emptycolor_code + textcolor_code + empty_portion + "|n" ) return final_bar