Windows Graphics GDI Reference

Introduction

The Graphics Device Interface (GDI) is a low-level graphics API that Windows uses to create graphical user interfaces. This document provides a detailed overview of key concepts and functions.

Key Concepts

GDI utilizes a layered approach:

• Layers: Represented as numeric identifiers (e.g., 0 for the background, 1 for the foreground).

• Pixels: Represented as numeric values (e.g., 0-255 for each color).

• Transformations: Apply geometric changes to graphics objects (translation, rotation, scaling).

GDI-Macros - The Core

GDI-Macros are a set of routines that execute on the GDI to perform tasks like drawing, text formatting, and animations. They are essential for creating dynamic user interfaces.

Example: Drawing a Rectangle

This example demonstrates a simple drawing routine:

            // Simple Rectangle Drawing
            function drawRectangle(x, y, width, height) {
                // Set the fill color
                fill(255, 0, 0); // Red

                // Draw the rectangle
                rect(x, y, width, height);
            }

            drawRectangle(100, 100, 50, 50);
            

Resources

For more details, see: [https://learn.microsoft.com/en-us/windows/graphics/gdi-reference](https://learn.microsoft.com/en-us/windows/graphics/gdi-reference)