{"id":21661,"date":"2022-11-14T16:45:04","date_gmt":"2022-11-14T11:15:04","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-rotate-one-object-at-another-slowly\/"},"modified":"2022-11-14T16:45:04","modified_gmt":"2022-11-14T11:15:04","slug":"solved-how-to-rotate-one-object-at-another-slowly","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-rotate-one-object-at-another-slowly\/","title":{"rendered":"[Solved] How to rotate one object at another (slowly)"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-51717219\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"51717219\" data-parentid=\"51715657\" data-score=\"1\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>This question is quite unclear. But, I&#8217;m assuming you essentially just want to rotate an element around an arbitrary point on a HTML5 canvas.<\/p>\n<p>On a canvas, you can only draw one element at a time. You can&#8217;t really manipulate singular elements &#8211; for example, you can&#8217;t rotate an element by itself. Instead, you&#8217;d need to rotate the entire canvas. This will always rotate around the centre of the canvas, but if you move the canvas origin, then you will draw on a different part of the canvas; thus allowing you to rotate around a point.<\/p>\n<p>Check out the following example. You can click anywhere on the canvas to make the square rotate around that point. Hopefully this is what you are after:<\/p>\n<\/p>\n<div class=\"snippet\" data-lang=\"js\" data-hide=\"false\" data-console=\"true\" data-babel=\"false\">\n<div class=\"snippet-code\">\n<pre class=\"snippet-code-js lang-js prettyprint-override\"><code>let cv = document.getElementById(\"cv\");\r\nlet ctx = cv.getContext(\"2d\");\r\nlet angle = 0;\r\n\r\n\/\/Variables you can change:\r\nlet speed = 1; \/\/Degrees to rotate per frame\r\nlet pointX = 250; \/\/The x-coord to rotate around\r\nlet pointY = 250; \/\/The y-coord to rotate around\r\n\r\nctx.fillStyle = \"#000\";\r\n\r\nsetInterval(()=&gt;{ \/\/This code runs every 40ms; so that the animation looks smooth\r\n  angle = (angle + speed) % 360; \/\/Increment the angle. Bigger changes here mean that the element will rotate faster. If we go over 360deg, reset back to 0.\r\n  \r\n  ctx.clearRect(0, 0, 400, 400); \/\/Clear away the previous frame.\r\n  \r\n  \/\/Draw the point we are rotating around\r\n  ctx.beginPath();\r\n  ctx.arc(pointX,pointY,5,0,2*Math.PI);\r\n  ctx.fill();\r\n  ctx.closePath();\r\n  \r\n  ctx.save(); \/\/Save the state before we transform and rotate the canvas; so we can go back to the unrotated canvas for the next frame\r\n  \r\n  ctx.translate(pointX, pointY); \/\/Move the origin (0, 0) point of the canvas to the point to rotate around. The canvas always rotates around the origin; so this will allow us to rotate around that point\r\n  ctx.rotate(angle*Math.PI\/180); \/\/Rotate the canvas by the current angle. You can use your Math.degrees function to convert between rads \/ degs here.\r\n  \r\n  ctx.fillStyle = \"#f00\"; \/\/Draw in red. This is also restored when ctx.restore() is called; hence the point will always be black; and the square will always be red.\r\n  \r\n  ctx.fillRect(0, 0, 50, 50); \/\/Draw the item we want rotated. You can draw anything here; I just draw a square.\r\n  \r\n  ctx.restore(); \/\/Restore the canvas state\r\n  \r\n}, 40);\r\n\r\n\r\n\r\n\r\n\r\n\/\/Boring event handler stuff\r\n\/\/Move the point to where the user clicked\r\n\/\/Not too robust; relys on the body padding not changing\r\n\/\/Really just for the demo\r\n\r\n\r\ncv.addEventListener(\"click\", (event)=&gt;{\r\n    pointX = event.clientX - 10;\r\n    pointY = event.clientY - 10;\r\n});<\/code><\/pre>\n<pre class=\"snippet-code-css lang-css prettyprint-override\"><code>#cv {\r\n  border:solid 1px #000; \/*Just so we can see the bounds of the canvas*\/\r\n  padding:0;\r\n  margin:0;\r\n}\r\n\r\nbody {\r\n  padding:10px;\r\n  margin:0;\r\n}<\/code><\/pre>\n<pre class=\"snippet-code-html lang-html prettyprint-override\"><code>&lt;canvas id=\"cv\" width=\"400\" height=\"400\"&gt;&lt;\/canvas&gt;&lt;br&gt;\r\nClick on the canvas above to make the rectangle rotate around the point that was clicked.<\/code><\/pre>\n<\/div>\n<\/div><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">3<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved How to rotate one object at another (slowly) <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] This question is quite unclear. But, I&#8217;m assuming you essentially just want to rotate an element around an arbitrary point on a HTML5 canvas. On a canvas, you can only draw one element at a time. You can&#8217;t really manipulate singular elements &#8211; for example, you can&#8217;t rotate an element by itself. Instead, you&#8217;d &#8230; <a title=\"[Solved] How to rotate one object at another (slowly)\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-rotate-one-object-at-another-slowly\/\" aria-label=\"More on [Solved] How to rotate one object at another (slowly)\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[346,333],"class_list":["post-21661","post","type-post","status-publish","format-standard","hentry","category-solved","tag-html","tag-javascript"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How to rotate one object at another (slowly) - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-rotate-one-object-at-another-slowly\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to rotate one object at another (slowly) - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] This question is quite unclear. But, I&#8217;m assuming you essentially just want to rotate an element around an arbitrary point on a HTML5 canvas. On a canvas, you can only draw one element at a time. You can&#8217;t really manipulate singular elements &#8211; for example, you can&#8217;t rotate an element by itself. Instead, you&#8217;d ... 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