{"id":454,"date":"2022-05-16T11:22:55","date_gmt":"2022-05-16T03:22:55","guid":{"rendered":"http:\/\/www.mapleriver.cn\/?p=454"},"modified":"2022-06-14T20:32:10","modified_gmt":"2022-06-14T12:32:10","slug":"%e3%80%90unity-ui%e3%80%91ui%e7%9a%84%e5%b0%84%e7%ba%bf%e6%a3%80%e6%b5%8b","status":"publish","type":"post","link":"https:\/\/www.mapleriver.cn\/?p=454","title":{"rendered":"\u3010Unity UI\u3011UI\u7684\u5c04\u7ebf\u68c0\u6d4b"},"content":{"rendered":"

 \u00a0 Unity\u4e2dUI\u7684\u5c04\u7ebf\u68c0\u6d4b\u7531Graphic Raycaster\u8fdb\u884c\u7ba1\u7406\u3002
\n\"\"<\/a><\/p>\n

[RequireComponent(typeof(Canvas))]\npublic class GraphicRaycaster : BaseRaycaster\n{\n\n    public override int sortOrderPriority\n    {\n        get\n        {\n            \/\/ We need to return the sorting order here as distance will all be 0 for overlay.\n            if (canvas.renderMode == RenderMode.ScreenSpaceOverlay)\n                return canvas.sortingOrder;\n            return base.sortOrderPriority;\n        }\n    }\n    public override int renderOrderPriority\n    {\n        get\n        {\n            \/\/ We need to return the sorting order here as distance will all be 0 for overlay.\n            if (canvas.renderMode == RenderMode.ScreenSpaceOverlay)\n                return canvas.rootCanvas.renderOrder;\n            return base.renderOrderPriority;\n        }\n    }\n}<\/code><\/pre>\n
 \u00a0 \u4ece\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\u53ef\u4ee5\u770b\u51fa\u6765GraphicRaycaster\u9700\u8981\u4f9d\u8d56\u4e8eCanvas\u7ec4\u4ef6\uff0c\u800c\u4e14\u5176\u4e2d\u4f1a\u7f13\u5b58Canvas\u4e0a\u7684\u6392\u5e8f\u987a\u5e8f\uff0c\u540e\u9762\u8fd9\u4e24\u4e2a\u5c5e\u6027\u4f1a\u5728EventSystem\u4e2d\u4f5c\u4e3a\u540e\u7eed\u4e8b\u4ef6\u89e6\u53d1\u7684\u6392\u5e8f\u4f9d\u636e\u3002\uff08\u5f53\u7136\u4eca\u5929\u6211\u4eec\u4e0d\u7814\u7a76EventSystem\uff0c\u8fd9\u91cc\u63d0\u4e00\u4e0b\u5c31\u4e0d\u7ba1\u5177\u4f53\u662f\u600e\u4e48\u5b9e\u73b0\u7684\u4e86\uff09
\n \u00a0 \u63a5\u4e0b\u6765\u5c31\u662fGraphicRaycaster\u662f\u600e\u4e48\u8fdb\u884c\u7684\u5c04\u7ebf\u68c0\u6d4b\uff1a<\/p>\n
private static void Raycast(Canvas canvas, Camera eventCamera, Vector2 \npointerPosition, IList<Graphic> foundGraphics, List<Graphic> results)\n{\n    \/\/ Necessary for the event system\n    int totalCount = foundGraphics.Count;\n    for (int i = 0; i < totalCount; ++i)\n    {\n        Graphic graphic = foundGraphics[i];\n        \/\/ -1 means it hasn't been processed by the canvas, which means it isn't actually drawn\n        if (!graphic.raycastTarget || graphic.canvasRenderer.cull || graphic.depth == -1)\n            continue;\n        if (!RectTransformUtility.RectangleContainsScreenPoint(graphic.rectTransform, pointerPosition, eventCamera))\n            continue;\n        if (eventCamera != null && eventCamera.WorldToScreenPoint(graphic.rectTransform.position).z > eventCamera.farClipPlane)\n            continue;\n        if (graphic.Raycast(pointerPosition, eventCamera))\n        {\n            s_SortedGraphics.Add(graphic);\n        }\n    }\n    s_SortedGraphics.Sort((g1, g2) => g2.depth.CompareTo(g1.depth));\n    totalCount = s_SortedGraphics.Count;\n    for (int i = 0; i < totalCount; ++i)\n        results.Add(s_SortedGraphics[i]);\n    s_SortedGraphics.Clear();\n}<\/code><\/pre>\n
 \u00a0 \u5176\u4e2deventCamera\u4f1a\u6839\u636eCanvas\u7ec4\u4ef6\u7684\u6e32\u67d3\u6a21\u5f0f\u4e0d\u540c\u800c\u4e0d\u540c\uff1a<\/p>\n
public override Camera eventCamera\n{\n    get\n    {\n        if (canvas.renderMode == RenderMode.ScreenSpaceOverlay ||(canvas.renderMode == RenderMode.ScreenSpaceCamera && canvas.worldCamera == null))\n            return null;\n        return canvas.worldCamera != null ? canvas.worldCamera : \nCamera.main;\n    }\n}<\/code><\/pre>\n
 \u00a0 foundGraphics\u5176\u5b9e\u4e5f\u662f\u901a\u8fc7var canvasGraphics = GraphicRegistry.GetGraphicsForCanvas(canvas);<\/code>\u51fd\u6570\uff0c\u4ececanvas\u4e2d\u83b7\u53d6\u4e0b\u9762\u6240\u6709\u7684Graphic\u7ec4\u4ef6\u3002
\n \u00a0 \u90a3\u4e48\u8fd9\u4e2a\u5c04\u7ebf\u68c0\u6d4b\u63a5\u53e3\u5c31\u5f88\u5bb9\u6613\u7406\u89e3\u4e86\uff1a<\/p>\n
    \n
  • \u4f20\u5165\u53c2\u6570canvas\uff08\u4ee3\u7801\u91cc\u4e5f\u6ca1\u7528\u5230\u554a\uff0c\u4f20\u8fdb\u6765\u5e72\u5565\u554a\uff1f\uff09\uff0c\u4e8b\u4ef6\u76f8\u673a\uff0c\u89e6\u53d1\u70b9\uff0cGraphic\u7ec4\u4ef6\uff0c\u7ed3\u679cList<\/li>\n
  • \u904d\u5386Graphic\uff0c\u5254\u9664\u6389\u7ec4\u4ef6\u91cc\u6ca1\u5f00raycastTarget\u7684\u3001\u5254\u9664\u7684\u3001\u6df1\u5ea6=-1\u7684\uff0cGrapgic\u6ca1\u5728\u5c4f\u5e55\u91cc\u7684<\/li>\n
  • \u68c0\u6d4b\u89e6\u53d1\u70b9\u662f\u5426\u5728Graphic\u5185\uff0c\u5982\u679c\u89e6\u53d1\u6210\u529f\u4e86\uff0c\u5c31\u6392\u4e00\u4e0b\u5e8f\u7136\u540e\u52a0\u5230\u7ed3\u679c\u5217\u8868\u91cc<\/li>\n<\/ul>\n
     \u00a0 \u6240\u4ee5\u5176\u5b9eUI\u7684\u5c04\u7ebf\u68c0\u6d4b\u53ea\u4f1a\u68c0\u6d4b\u5230Graphic\u7ec4\u4ef6\uff0c\u5982\u679c\u4f60\u60f3\u81ea\u5df1\u5b9a\u4e49\u4e00\u4e2a\u53ef\u4ee5\u63a5\u53d7UI\u5c04\u7ebf\u68c0\u6d4b\u7684\u7ec4\u4ef6\uff0c\u90a3\u5c31\u5199\u4e00\u4e2a\u7ec4\u4ef6\u7ee7\u627fGraphic\u7c7b\u5c31\u53ef\u4ee5\u62c9~\u7136\u540e\u8fd8\u53ef\u4ee5\u628a\u9876\u70b9\u4ec0\u4e48\u7684\u6e05\u4e86\uff0c\u5c31\u4f1a\u5f97\u5230\u4e00\u4e2a\u4e0d\u4f1a\u6e32\u67d3\u4f46\u662f\u4f1a\u63a5\u6536\u5c04\u7ebf\u7684\u7ec4\u4ef6\u4e86\uff0c\u6bd4\u5982\uff1a<\/p>\n
    public class NoDrawingRayCast : Graphic\n{\n    public override void SetMaterialDirty()\n    {\n    }\n    public override void SetVerticesDirty()\n    {\n    }\n}<\/code><\/pre>\n
     \u00a0 \u56e0\u4e3aGraphic\u91cc\u5b9a\u4e49\u4e86material\u548ccolor\uff0c\u8fd9\u91cc\u628a\u4e24\u4e2aSetDirty\u51fd\u6570\u91cd\u5199\u4fdd\u8bc1\u5728\u4fee\u6539\u5bf9\u5e94\u7684\u989c\u8272\u548c\u6750\u8d28\u65f6\u4e0d\u4f1a\u89e6\u53d1\u91cd\u5efa\u5bfc\u81f4\u7ec4\u4ef6\u88ab\u7ed8\u5236\u3002\u5982\u679c\u89c9\u5f97\u8fd8\u662f\u4e0d\u4fdd\u51c6\u7684\u8bdd\uff0c\u53ef\u4ee5\u8003\u8651\u91cd\u5199\u4e00\u4e0bOnPopulateMesh\u51fd\u6570\uff0c\u628a\u9876\u70b9\u6570\u636e\u90fd\u6e05\u4e86\uff0c\u8fd9\u6837\u5c31\u80af\u5b9a\u4e0d\u4f1a\u7ed8\u5236\u4e86~<\/p>\n","protected":false},"excerpt":{"rendered":"
     \u00a0 Unity\u4e2dUI\u7684\u5c04\u7ebf\u68c0\u6d4b\u7531Graphic Raycaster\u8fdb\u884c\u7ba1\u7406\u3002 [Requ […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33],"tags":[27],"class_list":["post-454","post","type-post","status-publish","format-standard","hentry","category-unity-ui","tag-unityui"],"_links":{"self":[{"href":"https:\/\/www.mapleriver.cn\/index.php?rest_route=\/wp\/v2\/posts\/454","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mapleriver.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mapleriver.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mapleriver.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mapleriver.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=454"}],"version-history":[{"count":1,"href":"https:\/\/www.mapleriver.cn\/index.php?rest_route=\/wp\/v2\/posts\/454\/revisions"}],"predecessor-version":[{"id":456,"href":"https:\/\/www.mapleriver.cn\/index.php?rest_route=\/wp\/v2\/posts\/454\/revisions\/456"}],"wp:attachment":[{"href":"https:\/\/www.mapleriver.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=454"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mapleriver.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=454"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mapleriver.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=454"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}