Compose 繪圖功能簡介
透過集合功能整理內容
你可以依據偏好儲存及分類內容。
瞭解如何在 Compose 中繪製自訂項目。當內建元件無法滿足應用程式需求時,您可以透過自訂繪圖來改善應用程式的外觀和風格。
重點
DrawScope
是宣告式無狀態繪圖 API,可用來繪製形狀、路徑等,且無須手動維護元件的狀態。
- 您可以透過幾種繪圖輔助鍵存取
DrawScope
,藉此使用其他可組合項繪圖:
- Compose 中的座標系統與檢視畫面系統相同。
- 所有繪圖和版面配置呼叫都會以像素值執行,而非
dp
。如要繪製在各螢幕上一致的圖形,請在繪製前使用 dp
並轉換為像素。
- 繪圖呼叫一律相對於父項可組合項。
包含此指南的集合
本指南是精選的快速指南系列之一,涵蓋更廣泛的 Android 開發目標:
顯示圖片
瞭解如何運用明亮吸睛的視覺元素,為 Android 應用程式打造美觀的視覺效果。
這個頁面中的內容和程式碼範例均受《內容授權》中的授權所規範。Java 與 OpenJDK 是 Oracle 和/或其關係企業的商標或註冊商標。
上次更新時間:2025-02-06 (世界標準時間)。
[[["容易理解","easyToUnderstand","thumb-up"],["確實解決了我的問題","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["缺少我需要的資訊","missingTheInformationINeed","thumb-down"],["過於複雜/步驟過多","tooComplicatedTooManySteps","thumb-down"],["過時","outOfDate","thumb-down"],["翻譯問題","translationIssue","thumb-down"],["示例/程式碼問題","samplesCodeIssue","thumb-down"],["其他","otherDown","thumb-down"]],["上次更新時間:2025-02-06 (世界標準時間)。"],[],[],null,["# Intro to drawing in Compose\n\n\u003cbr /\u003e\n\nLearn how to draw something custom in Compose. With custom drawing, you can\nimprove the look and feel of your app when the built-in components don't cover\nexactly what your app needs. \n\nKey points\n----------\n\n- [`DrawScope`](/reference/kotlin/androidx/compose/ui/graphics/drawscope/DrawScope) is a declarative, stateless drawing API to draw shapes, paths, and more without needing to maintain the state of the component manually.\n- Several drawing modifiers give you access to `DrawScope`, letting you draw with other composables:\n - [`drawBehind`](/reference/kotlin/androidx/compose/ui/draw/package-summary#(androidx.compose.ui.Modifier).drawBehind(kotlin.Function1)): draws behind the composables content.\n - [`drawWithContent`](/reference/kotlin/androidx/compose/ui/draw/package-summary#(androidx.compose.ui.Modifier).drawWithContent(kotlin.Function1)): useful for rearranging content. You can choose when to call the content of the composable, either before or after.\n - [`drawWithCache`](/reference/kotlin/androidx/compose/ui/draw/package-summary#(androidx.compose.ui.Modifier).drawWithCache(kotlin.Function1)): caches the objects until the size changes or the state variables read inside change.\n- The coordinate system in Compose is the same as the view system.\n- All draw and layout calls are performed in pixel values, not [`dp`](/reference/kotlin/androidx/compose/ui/unit/package-summary#(kotlin.Int).dp()). To draw consistently across screens, use `dp` and convert to pixels before drawing.\n- Draw calls are always relative to the parent composable.\n\nCollections that contain this guide\n-----------------------------------\n\nThis guide is part of these curated Quick Guide collections that cover\nbroader Android development goals: \n\n### Display images\n\nDiscover techniques for using bright, engaging visuals to give your Android app a beautiful look and feel. \n[Quick guide collection](/develop/ui/compose/quick-guides/collections/display-images) \n\nHave questions or feedback\n--------------------------\n\nGo to our frequently asked questions page and learn about quick guides or reach out and let us know your thoughts. \n[Go to FAQ](/quick-guides/faq) [Leave feedback](https://issuetracker.google.com/issues/new?component=1573691&template=1993320)"]]