CSS Shape Generator

This JavaScript code is the core logic behind the "CSS Shape Generator Tool" Canvas. It's responsible for taking user inputs (shape type, size, and color), generating the corresponding CSS code for that shape, and then displaying a live preview of the shape and its CSS. Here's a breakdown of what the selected code does: Element References: It starts by getting references to all the necessary HTML elements on the page, such as the dropdown for shape type, input fields for size and color, the "Generate Shape" button, the preview area for the shape, the textarea for CSS output, and the "Download CSS" button, along with elements for displaying error messages. generateShapeCss Function: This is the main function that calculates and returns the CSS string for the selected shape. It takes shapeType, size, and color as parameters. It uses a switch statement to handle different shape types (square, circle, and various triangles). For each shape type, it constructs the appropriate CSS properties (e.g., width, height, background-color, border-radius, border-left, border-right, etc.). Crucially, it also directly applies the generated CSS to the shapePreview element's style.cssText property. This allows for the real-time visual update of the shape in the preview area. For triangles, it leverages CSS border properties with transparent borders to create the triangular shape. "Generate Shape" Button Event Listener: When the "Generate Shape" button is clicked, this event listener is triggered. It first clears any existing error messages and the previous shape preview. It retrieves the current values from the shape type, size, and color input fields. Input Validation: It performs a check to ensure the size input is a valid number within the specified range (10 to 500 pixels). If not, it displays an error and stops. It then calls the generateShapeCss function with the collected inputs to get the CSS string. If CSS is successfully generated, it populates the cssOutput textarea with the generated code and makes the "Download CSS" button visible. Otherwise, it displays a general error message. "Download CSS" Button Event Listener: When this button is clicked, it takes the CSS content from the cssOutput textarea. It creates a Blob (Binary Large Object) containing the CSS text, sets its type to text/css, and then creates a URL for this blob. It creates a temporary <a> (anchor) element, sets its href to the blob URL, and sets its download attribute to a suggested filename (generated_shape.css). It then programmatically "clicks" this hidden link to trigger the download in the user's browser. Finally, it cleans up by removing the temporary link and revoking the object URL to free up memory. Initial Generation on Load: The generateButton.click(); line at the end ensures that a default shape (a square with default size and color) is generated and displayed immediately when the Canvas loads, providing an initial visual.