[size=3]Introduction[/size]
This script is designed to plot key levels (daily, weekly, monthly, quarterly, and initial balance) on trading charts. These levels provide traders with significant reference points from previous periods.
[size=3]Original Code Functionality[/size]
The original script accomplished the following:
Input Handling: Allowed users to toggle the visibility of daily, weekly, monthly, quarterly, and initial balance levels.
Data Fetching: Retrieved open, high, low, and close prices from previous periods using the request.security function.
Level Drawing: Used the drawLevel function to plot levels and create/update labels for each level.
Alerts: Set up alerts to notify users when the price reached key levels.
However, the original script faced issues with label creation and updating due to the use of mutable arguments in functions, leading to repeated plotting of labels.
[size=3]Updated Code Enhancements[/size]
The updated script addresses the issues in the original by restructuring the label handling and ensuring that labels are created and updated correctly without repetition.
[size=3]Changes and Enhancements[/size]
The key changes and enhancements made in the updated script are as follows:
Label Management:
Original Approach: Used a single function (drawLevel) to draw lines and manage labels. This function accepted mutable arguments, causing errors and label duplication.
Updated Approach: Separated line drawing and label updating into distinct functions. Managed label creation and updating using global variables and conditional logic outside the function to avoid mutable arguments.
Function Separation:
Line Drawing: The drawLine function is responsible for drawing lines without managing labels.
Label Updating/Creation: Labels are created or updated using straightforward if-else conditions, ensuring they are managed correctly without duplication.
Error Handling and Code Simplification:
Removed the use of ternary operators for label updates, replacing them with if-else blocks to handle label creation and updating more robustly.
Simplified the code structure to enhance readability and maintainability.
[size=3]Detailed Code Comparison[/size]
Original Code Excerpt:
[code]
drawLevel(price, color, labelRef, labelText) =>
if not na(price)
line.new(bar_index, price, bar_index + 500, price, color=color, width=2, extend=extend.right)
if na(labelRef)
labelRef := label.new(bar_index, price, text=labelText, color=color, textcolor=color.white, style=label.style_label_right, size=size.tiny, yloc=yloc.price, xloc=xloc.bar_index)
else
label.set_xy(labelRef, bar_index, price)
labelRef
[/code]
Updated Code Excerpt:
[code]
drawLine(price, color) =>
if not na(price)
line.new(bar_index, price, bar_index + 500, price, color=color, width=2, extend=extend.right)
// Update or create labels
if na(dailyOpenLabel)
dailyOpenLabel := label.new(bar_index, previousDayOpen, text="Prev Open", color=color.orange, textcolor=color.white, style=label.style_label_right, size=size.tiny, yloc=yloc.price)
else
label.set_xy(dailyOpenLabel, bar_index, previousDayOpen)
[/code]
[size=3]Comparison and Conclusion[/size]
Benefits of the Updated Approach:
Correct Label Handling: The updated script ensures that labels are created and updated correctly without duplication, solving the primary issue in the original code.
Improved Readability: By separating concerns (line drawing and label management), the code is more readable and easier to maintain.
Robustness: The use of if-else blocks for label management avoids issues with mutable arguments and ternary operators, making the script more robust.
Conclusion:
The updated script provides a more reliable and maintainable solution for automatically plotting key levels