Discussing the article: "MQL5 Trading Tools (Part 15): Canvas Blur Effects, Shadow Rendering, and Smooth Mouse Wheel Scrolling"
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Check out the new article: MQL5 Trading Tools (Part 15): Canvas Blur Effects, Shadow Rendering, and Smooth Mouse Wheel Scrolling.
In this article, we enhance the MQL5 canvas dashboard with advanced visual effects, including blur gradients for fog overlays, shadow rendering for headers, and antialiased drawing for smoother lines and curves. We add smooth mouse wheel scrolling to the text panel that does not interfere with the chart zoom scale, technically an upgrade.
The canvas blur effects create smooth gradients, such as fog overlays on backgrounds, by interpolating pixel colors with varying opacity to simulate depth and soften visuals without harsh edges. Shadow rendering adds realism to elements like headers through layered drawing with offset rectangles and decreasing opacity, using Gaussian-like blur via multiple passes to produce soft, diffused edges that enhance the UI's three-dimensional feel. Mouse wheel scrolling enables seamless navigation in text panels by adjusting scroll positions incrementally, with clamping to prevent overflow and integration with hover-expandable scrollbars for intuitive content exploration.
We will apply bicubic interpolation for high-quality image scaling and antialiasing in lines, implement shadow functions with parametric control for distance and blur radius, and handle wheel events to update text offsets while preserving chart interactions. In brief, these enhancements deliver a polished, responsive dashboard that combines aesthetic appeal with user-friendly controls for better trading visualization as seen below.
Author: Allan Munene Mutiiria