{"id":2714,"date":"2026-05-05T16:21:08","date_gmt":"2026-05-05T08:21:08","guid":{"rendered":"https:\/\/randengzhe.cn\/wordpress\/?p=2714"},"modified":"2026-05-16T08:01:10","modified_gmt":"2026-05-16T00:01:10","slug":"sfml-day4","status":"publish","type":"post","link":"https:\/\/randengzhe.cn\/wordpress\/2026\/05\/05\/sfml-day4\/","title":{"rendered":"Day4 SFML+\u4ea4\u4e92\u5f0f\u5750\u6807"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"> <strong>Day4<\/strong> \u2014\u2014 <strong>\u4ea4\u4e92\u529f\u80fd<\/strong><br>\u8fd9\u662f\u4f60\u505a\u7269\u7406\u3001\u5316\u5b66\u5b9e\u9a8c\u8f6f\u4ef6<strong>\u6700\u5173\u952e\u7684\u4e00\u5929<\/strong>\uff01<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\r\n<div class=\"ez-toc-title-container\">\r\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\r\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\r\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/randengzhe.cn\/wordpress\/2026\/05\/05\/sfml-day4\/#Day4_%E7%9B%AE%E6%A0%87\" >Day4 \u76ee\u6807<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/randengzhe.cn\/wordpress\/2026\/05\/05\/sfml-day4\/#Day4%E5%9B%BE%E5%BD%A2%E9%A2%84%E8%A7%88\" >Day4\u56fe\u5f62\u9884\u89c8<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/randengzhe.cn\/wordpress\/2026\/05\/05\/sfml-day4\/#%E6%96%87%E4%BB%B6%E5%90%8D%EF%BC%9Aday4_interactivecpp\" >\u6587\u4ef6\u540d\uff1aday4_interactive.cpp<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/randengzhe.cn\/wordpress\/2026\/05\/05\/sfml-day4\/#Makefile\" >Makefile<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/randengzhe.cn\/wordpress\/2026\/05\/05\/sfml-day4\/#%E4%BD%BF%E7%94%A8%E8%A7%84%E5%88%99\" >\u4f7f\u7528\u89c4\u5219<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/randengzhe.cn\/wordpress\/2026\/05\/05\/sfml-day4\/#%E8%BF%90%E8%A1%8C%E5%91%BD%E4%BB%A4\" >\u8fd0\u884c\u547d\u4ee4<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/randengzhe.cn\/wordpress\/2026\/05\/05\/sfml-day4\/#%E4%BD%A0%E5%8F%AF%E4%BB%A5%E8%BF%99%E6%A0%B7%E6%93%8D%E4%BD%9C\" >\u4f60\u53ef\u4ee5\u8fd9\u6837\u64cd\u4f5c<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/randengzhe.cn\/wordpress\/2026\/05\/05\/sfml-day4\/#%E8%BF%99%E4%B8%80%E5%A4%A9%E5%AE%8C%E6%88%90%E5%90%8E\" >\u8fd9\u4e00\u5929\u5b8c\u6210\u540e<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\r\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Day4_%E7%9B%AE%E6%A0%87\"><\/span>Day4 \u76ee\u6807<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u9f20\u6807\u79fb\u52a8 \u2192 \u5b9e\u65f6\u663e\u793a\u6570\u5b66\u5750\u6807\uff08\u8d85\u7ea7\u5b9e\u7528\uff09<\/strong><\/li>\n\n\n\n<li><strong>\u952e\u76d8\u65b9\u5411\u952e \u2192 \u5e73\u79fb\u5750\u6807\u7cfb<\/strong><\/li>\n\n\n\n<li><strong>\u9f20\u6807\u6eda\u8f6e \u6eda\u52a8 \u2192 \u7f29\u653e\u5750\u6807\u7cfb<\/strong><\/li>\n\n\n\n<li>\u6240\u6709\u51fd\u6570<strong>\u8ddf\u7740\u4e00\u8d77\u52a8<\/strong>\uff0c\u5b8c\u7f8e\u6a21\u62df\u5b9e\u9a8c\u4eea\u5668<\/li>\n<\/ol>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Day4%E5%9B%BE%E5%BD%A2%E9%A2%84%E8%A7%88\"><\/span>Day4\u56fe\u5f62\u9884\u89c8<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u663e\u793a\u5750\u6807\u7cfb<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ea4\u4e92\u5750\u6807\u7cfb\uff0c\u5de6\u4e0a\u89d2\u663e\u793a\u5750\u6807\u4f4d\u7f6e\u4fe1\u606f<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"655\" src=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_interactive_2026-05-05-10-18-27.png\" alt=\"\" class=\"wp-image-2716\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u9f20\u6807\u5728\u7b2c\u4e00\u8c61\u9650<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"655\" src=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_1Quadrant_2026-05-05-10-18-47.png\" alt=\"\" class=\"wp-image-2719\" srcset=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_1Quadrant_2026-05-05-10-18-47.png 820w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_1Quadrant_2026-05-05-10-18-47-300x240.png 300w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_1Quadrant_2026-05-05-10-18-47-768x613.png 768w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_1Quadrant_2026-05-05-10-18-47-376x300.png 376w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u9f20\u6807\u5728\u7b2c\u4e8c\u8c61\u9650<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"655\" src=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_2Quadrant_2026-05-05-10-18-53.png\" alt=\"\" class=\"wp-image-2720\" srcset=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_2Quadrant_2026-05-05-10-18-53.png 820w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_2Quadrant_2026-05-05-10-18-53-300x240.png 300w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_2Quadrant_2026-05-05-10-18-53-768x613.png 768w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_2Quadrant_2026-05-05-10-18-53-376x300.png 376w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u9f20\u6807\u5728\u7b2c\u4e09\u8c61\u9650<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"655\" src=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_3Quadrant_2026-05-05-10-18-57.png\" alt=\"\" class=\"wp-image-2721\" srcset=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_3Quadrant_2026-05-05-10-18-57.png 820w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_3Quadrant_2026-05-05-10-18-57-300x240.png 300w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_3Quadrant_2026-05-05-10-18-57-768x613.png 768w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_3Quadrant_2026-05-05-10-18-57-376x300.png 376w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u9f20\u6807\u5728\u7b2c\u56db\u8c61\u9650<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"655\" src=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_4Quadrant_2026-05-05-10-19-01.png\" alt=\"\" class=\"wp-image-2722\" srcset=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_4Quadrant_2026-05-05-10-19-01.png 820w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_4Quadrant_2026-05-05-10-19-01-300x240.png 300w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_4Quadrant_2026-05-05-10-19-01-768x613.png 768w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_4Quadrant_2026-05-05-10-19-01-376x300.png 376w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e73\u79fb\u5750\u6807\u7cfb\uff0c\u952e\u76d8\u65b9\u5411\u952e\u4e0a\u4e0b\u5de6\u53f3\u79fb\u52a8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u952e\u76d8\u4e0a\u79fb\u52a8<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"655\" src=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_upkey_2026-05-05-15-40-44.png\" alt=\"\" class=\"wp-image-2751\" srcset=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_upkey_2026-05-05-15-40-44.png 820w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_upkey_2026-05-05-15-40-44-300x240.png 300w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_upkey_2026-05-05-15-40-44-768x613.png 768w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_upkey_2026-05-05-15-40-44-376x300.png 376w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u952e\u76d8\u4e0b\u79fb\u52a8<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"655\" src=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_downkey_2026-05-05-15-41-00.png\" alt=\"\" class=\"wp-image-2746\" srcset=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_downkey_2026-05-05-15-41-00.png 820w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_downkey_2026-05-05-15-41-00-300x240.png 300w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_downkey_2026-05-05-15-41-00-768x613.png 768w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_downkey_2026-05-05-15-41-00-376x300.png 376w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u952e\u76d8\u5de6\u79fb\u52a8<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"655\" src=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_leftkey_2026-05-05-15-41-15.png\" alt=\"\" class=\"wp-image-2747\" srcset=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_leftkey_2026-05-05-15-41-15.png 820w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_leftkey_2026-05-05-15-41-15-300x240.png 300w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_leftkey_2026-05-05-15-41-15-768x613.png 768w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_leftkey_2026-05-05-15-41-15-376x300.png 376w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u952e\u76d8\u53f3\u79fb\u52a8<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"655\" src=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_rightkey_2026-05-05-15-41-35.png\" alt=\"\" class=\"wp-image-2748\" srcset=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_rightkey_2026-05-05-15-41-35.png 820w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_rightkey_2026-05-05-15-41-35-300x240.png 300w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_rightkey_2026-05-05-15-41-35-768x613.png 768w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_rightkey_2026-05-05-15-41-35-376x300.png 376w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u7f29\u653e\u5750\u6807\u7cfb\uff0c\u9f20\u6807\u6eda\u8f6e\u6eda\u52a8<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6eda\u8f6e\u5411\u4e0a\u6eda\u52a8\u653e\u5927<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"655\" src=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_scrollup_2026-05-05-15-47-02.png\" alt=\"\" class=\"wp-image-2750\" srcset=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_scrollup_2026-05-05-15-47-02.png 820w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_scrollup_2026-05-05-15-47-02-300x240.png 300w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_scrollup_2026-05-05-15-47-02-768x613.png 768w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_scrollup_2026-05-05-15-47-02-376x300.png 376w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6eda\u8f6e\u5411\u4e0b\u6eda\u52a8\u7f29\u5c0f<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"820\" height=\"655\" src=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_scrolldown_2026-05-05-15-47-18.png\" alt=\"\" class=\"wp-image-2749\" srcset=\"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_scrolldown_2026-05-05-15-47-18.png 820w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_scrolldown_2026-05-05-15-47-18-300x240.png 300w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_scrolldown_2026-05-05-15-47-18-768x613.png 768w, https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_scrolldown_2026-05-05-15-47-18-376x300.png 376w\" sizes=\"auto, (max-width: 820px) 100vw, 820px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u6211\u76f4\u63a5\u7ed9\u4f60<strong>\u5b8c\u6574\u53ef\u8fd0\u884c\u4ee3\u7801<\/strong>\uff0c\u590d\u5236\u5373\u7528\uff1a<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%96%87%E4%BB%B6%E5%90%8D%EF%BC%9Aday4_interactivecpp\"><\/span>\u6587\u4ef6\u540d\uff1a<code>day4_interactive.cpp<\/code><span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;SFML\/Graphics.hpp&gt;\n#include &lt;cmath&gt;\n\nusing namespace std;\n\nconst int WIN_W = 800;\nconst int WIN_H = 600;\n\n\/\/ \u53ef\u4ea4\u4e92\u53c2\u6570\uff1a\u504f\u79fb + \u7f29\u653e\nfloat offsetX = 0.0f;\nfloat offsetY = 0.0f;\nfloat scale   = 50.0f;\n\n\/\/ \u6570\u5b66\u5750\u6807 \u2192 \u5c4f\u5e55\u5750\u6807\uff08\u652f\u6301\u5e73\u79fb + \u7f29\u653e\uff09\nsf::Vector2f toScreen(float x, float y)\n{\n    return {\n        WIN_W \/ 2.0f + (x + offsetX) * scale,\n        WIN_H \/ 2.0f - (y + offsetY) * scale\n    };\n}\n\n\/\/ \u5c4f\u5e55\u5750\u6807 \u2192 \u6570\u5b66\u5750\u6807\uff08\u7ed9\u9f20\u6807\u7528\uff09\nsf::Vector2f toWorld(float sx, float sy)\n{\n    return {\n        (sx - WIN_W\/2.0f) \/ scale - offsetX,\n        (WIN_H\/2.0f - sy) \/ scale - offsetY\n    };\n}\n\nint main()\n{\n    sf::RenderWindow window(sf::VideoMode(WIN_W, WIN_H), L\"SFML Day4 \u4ea4\u4e92\u5f0f\u5750\u6807\u7cfb\");\n    window.setFramerateLimit(60);\n\n    \/\/ \u5b57\u4f53\uff08\u663e\u793a\u9f20\u6807\u5750\u6807\uff09\n    sf::Font font;\n    font.loadFromFile(\"\/usr\/share\/fonts\/truetype\/dejavu\/DejaVuSans.ttf\");\n\n    sf::Text text;\n    text.setFont(font);\n    text.setCharacterSize(18);\n    text.setFillColor(sf::Color::White);\n\n    \/\/ \u989c\u8272\n    sf::Color gridCol(50,50,70);\n    sf::Color axisCol(100,220,255);\n    sf::Color sinCol(255,80,80);\n    sf::Color cosCol(80,255,80);\n    sf::Color paraCol(255,255,80);\n\n    while (window.isOpen())\n    {\n        sf::Event e;\n        while (window.pollEvent(e))\n        {\n            if (e.type == sf::Event::Closed)\n                window.close();\n\n            \/\/ \u6eda\u8f6e\u7f29\u653e\n            if (e.type == sf::Event::MouseWheelScrolled)\n            {\n                scale += e.mouseWheelScroll.delta * 5;\n                if (scale &lt; 10) scale = 10;\n                if (scale &gt; 200) scale = 200;\n            }\n        }\n\n        \/\/ \u952e\u76d8\u5e73\u79fb\n        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Left))  offsetX += 0.5f;\n        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Right)) offsetX -= 0.5f;\n        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Up))    offsetY -= 0.5f;\n        if (sf::Keyboard::isKeyPressed(sf::Keyboard::Down))  offsetY += 0.5f;\n\n        window.clear(sf::Color(18,18,28));\n\n        \/\/ === \u7f51\u683c ===\n        for (int x=0;x&lt;=WIN_W;x+=50) {\n            sf::Vertex l&#91;] = {{{(float)x,0},gridCol}, {{(float)x,WIN_H},gridCol}};\n            window.draw(l,2,sf::Lines);\n        }\n        for (int y=0;y&lt;=WIN_H;y+=50) {\n            sf::Vertex l&#91;] = {{{0,(float)y},gridCol}, {{WIN_W,(float)y},gridCol}};\n            window.draw(l,2,sf::Lines);\n        }\n\n        \/\/ === \u5750\u6807\u8f74 ===\n        sf::Vertex xAxis&#91;] = {toScreen(-20,0), toScreen(20,0)};\n        sf::Vertex yAxis&#91;] = {toScreen(0,-15), toScreen(0,15)};\n        xAxis&#91;0].color = axisCol; xAxis&#91;1].color = axisCol;\n        yAxis&#91;0].color = axisCol; yAxis&#91;1].color = axisCol;\n        window.draw(xAxis,2,sf::Lines);\n        window.draw(yAxis,2,sf::Lines);\n\n        \/\/ === \u7ed8\u5236\u51fd\u6570 ===\n        for (float x=-10;x&lt;10;x+=0.04f) {\n            float y = sin(x);\n            sf::CircleShape p(1.5f);\n            p.setPosition(toScreen(x,y));\n            p.setFillColor(sinCol);\n            window.draw(p);\n        }\n        for (float x=-10;x&lt;10;x+=0.04f) {\n            float y = cos(x);\n            sf::CircleShape p(1.5f);\n            p.setPosition(toScreen(x,y));\n            p.setFillColor(cosCol);\n            window.draw(p);\n        }\n        for (float x=-5;x&lt;5;x+=0.04f) {\n            float y = 0.2f*x*x;\n            sf::CircleShape p(1.5f);\n            p.setPosition(toScreen(x,y));\n            p.setFillColor(paraCol);\n            window.draw(p);\n        }\n\n        \/\/ === \u9f20\u6807\u5b9e\u65f6\u5750\u6807 ===\n        sf::Vector2i mPos = sf::Mouse::getPosition(window);\n        sf::Vector2f wPos = toWorld(mPos.x, mPos.y);\n        char buf&#91;100];\n        sprintf(buf, \"X: %.2f  Y: %.2f\", wPos.x, wPos.y);\n        text.setString(buf);\n        text.setPosition(10,10);\n        window.draw(text);\n\n        window.display();\n    }\n    return 0;\n}<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Makefile\"><\/span>Makefile <span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code># \u7f16\u8bd1\u5668\nCXX := g++\n\n# \u7f16\u8bd1\u53c2\u6570\uff1a\u8b66\u544a + \u8c03\u8bd5 + C++11\nCXXFLAGS := -Wall -g -std=c++11\n\n# SFML \u5e93\uff08\u5fc5\u987b\u653e\u5728\u6700\u540e\uff09\nLIBS := -lsfml-graphics -lsfml-window -lsfml-system -lsfml-audio\n\n# \u8981\u7f16\u8bd1\u7684\u6e90\u4ee3\u7801\uff08\u53ea\u7f16\u8bd1 main.cpp\uff09\nSRC := day4_interactive.cpp\nOBJ := $(SRC:.cpp=.o)\n\n# \u6700\u7ec8\u751f\u6210\u7684\u7a0b\u5e8f\u540d\nTARGET := app4\n\n# \u9ed8\u8ba4\u7f16\u8bd1\nall: $(TARGET)\n\n# \u94fe\u63a5\u751f\u6210\u53ef\u6267\u884c\u6587\u4ef6\n$(TARGET): $(OBJ)\n    $(CXX) $(CXXFLAGS) -o $@ $(OBJ) $(LIBS)\n\n# \u7f16\u8bd1 cpp \u6587\u4ef6\n%.o: %.cpp\n    $(CXX) $(CXXFLAGS) -c $&lt; -o $@\n\n# \u6e05\u7406\nclean:\n    rm -f $(OBJ) $(TARGET)\n\n# \u8fd0\u884c\uff08\u53ef\u9009\uff0c\u8f93\u5165 make run \u5373\u53ef\u542f\u52a8\uff09\nrun: $(TARGET)\n    .\/$(TARGET)<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BD%BF%E7%94%A8%E8%A7%84%E5%88%99\"><\/span>\u4f7f\u7528\u89c4\u5219<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u7f16\u8bd1\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>   make<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd0\u884c\uff1a<\/p>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>   make run<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6e05\u7406\uff1a<\/p>\n\n\n\n<ol start=\"5\" class=\"wp-block-list\">\n<li><\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>   make clean<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%BF%90%E8%A1%8C%E5%91%BD%E4%BB%A4\"><\/span>\u8fd0\u884c\u547d\u4ee4<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<pre class=\"wp-block-code\"><code>.\/app4<\/code><\/pre>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h1 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BD%A0%E5%8F%AF%E4%BB%A5%E8%BF%99%E6%A0%B7%E6%93%8D%E4%BD%9C\"><\/span>\u4f60\u53ef\u4ee5\u8fd9\u6837\u64cd\u4f5c<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u65b9\u5411\u952e<\/strong>\uff1a\u5e73\u79fb\u5750\u6807\u7cfb<\/li>\n\n\n\n<li><strong>\u9f20\u6807\u6eda\u8f6e<\/strong>\uff1a\u653e\u5927 \/ \u7f29\u5c0f<\/li>\n\n\n\n<li><strong>\u9f20\u6807\u79fb\u52a8<\/strong>\uff1a\u5de6\u4e0a\u89d2\u5b9e\u65f6\u663e\u793a\u6570\u5b66\u5750\u6807\uff08\u7cbe\u786e\u5230\u5c0f\u6570\u70b9\u540e\u4e24\u4f4d\uff09<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%BF%99%E4%B8%80%E5%A4%A9%E5%AE%8C%E6%88%90%E5%90%8E\"><\/span>\u8fd9\u4e00\u5929\u5b8c\u6210\u540e<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f60\u5c31\u62e5\u6709\u4e86 <strong>\u4e13\u4e1a\u6570\u5b66\/\u7269\u7406\/\u5316\u5b66\u7ed8\u56fe\u5de5\u5177\u7684\u6838\u5fc3\u5f15\u64ce<\/strong>\uff01<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Day4 \u2014\u2014 \u4ea4\u4e92\u529f\u80fd\u8fd9\u662f\u4f60\u505a\u7269\u7406\u3001\u5316\u5b66\u5b9e\u9a8c\u8f6f\u4ef6 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":2716,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[30],"tags":[],"class_list":["post-2714","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sfml"],"jetpack_featured_media_url":"https:\/\/randengzhe.cn\/wordpress\/wp-content\/uploads\/2026\/05\/day4_interactive_2026-05-05-10-18-27.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/randengzhe.cn\/wordpress\/wp-json\/wp\/v2\/posts\/2714","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/randengzhe.cn\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/randengzhe.cn\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/randengzhe.cn\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/randengzhe.cn\/wordpress\/wp-json\/wp\/v2\/comments?post=2714"}],"version-history":[{"count":7,"href":"https:\/\/randengzhe.cn\/wordpress\/wp-json\/wp\/v2\/posts\/2714\/revisions"}],"predecessor-version":[{"id":3117,"href":"https:\/\/randengzhe.cn\/wordpress\/wp-json\/wp\/v2\/posts\/2714\/revisions\/3117"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/randengzhe.cn\/wordpress\/wp-json\/wp\/v2\/media\/2716"}],"wp:attachment":[{"href":"https:\/\/randengzhe.cn\/wordpress\/wp-json\/wp\/v2\/media?parent=2714"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/randengzhe.cn\/wordpress\/wp-json\/wp\/v2\/categories?post=2714"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/randengzhe.cn\/wordpress\/wp-json\/wp\/v2\/tags?post=2714"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}