A Practical Guide to C++ Graphics Programming Projects

In this guide, we will walk you step-by-step through building a pixel art editor using C++, including: creating a C++ project and adding the necessary headers and libraries. Instantiate an SFML window. Create a Sprite to act as the canvas and initialize the pixel array. Handle user input, such as mouse clicks and keyboard input, in the game loop. Sets pixels on the canvas based on the mouse click position. Render the canvas in the game loop.

C++ Graphics Programming Project Practical Guide

Preface

C++ is a A powerful programming language widely used in the field of graphics programming. In this guide, we'll walk you step-by-step through practical examples to build graphics applications using C++.

Practical Example: Pixel Art Editor

We will build a basic pixel art editor that allows you to draw and edit pixel art. Here's how to implement it:

Step 1: Set up the project

Create a C++ project and add the necessary headers and libraries:

#include <SFML/Graphics.hpp>

Step 2: Create a window

Instantiate an SFML window:

sf::RenderWindow window(sf::VideoMode(800, 600), "像元画编辑器");

Step 3: Create a canvas

Create A Sprite to act as the canvas and initialize the pixel array:

sf::Sprite canvas;
sf::Uint8 pixels[800 * 600 * 4];
canvas.setTexture(sf::Texture());

Step 4: Event handling

Handle user input in the game loop, such as mouse clicks and keyboard input ：

while (window.isOpen()) {
    sf::Event event;
    while (window.pollEvent(event)) {
        // 处理鼠标点击和键盘输入
    }
}

پنجمStep: Draw pixels

Set the pixels on the canvas according to the mouse click position:

if (sf::Mouse::isButtonPressed(sf::Mouse::Button::Left)) {
    sf::Vector2i pos = sf::Mouse::getPosition(window);
    pixels[4 * (pos.y * 800 + pos.x)] = 255;
    pixels[4 * (pos.y * 800 + pos.x) + 1] = 0;
    pixels[4 * (pos.y * 800 + pos.x) + 2] = 0;
    pixels[4 * (pos.y * 800 + pos.x) + 3] = 255;
    canvas.getTexture().update(pixels);
}

Step 6: Rendering Canvas

Rendering the canvas in the game loop:

window.draw(canvas);
window.display();

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