From b6db663269201fa14a6a4aa1b9042645a9e8f859 Mon Sep 17 00:00:00 2001
From: crupest <crupest@outlook.com>
Date: Fri, 24 May 2019 23:45:58 +0800
Subject: ...

---
 include/cru/platform/graph/util/painter_util.hpp | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 include/cru/platform/graph/util/painter_util.hpp

(limited to 'include/cru/platform/graph/util')

diff --git a/include/cru/platform/graph/util/painter_util.hpp b/include/cru/platform/graph/util/painter_util.hpp
new file mode 100644
index 00000000..71e125c3
--- /dev/null
+++ b/include/cru/platform/graph/util/painter_util.hpp
@@ -0,0 +1,18 @@
+#pragma once
+#include "../painter.hpp"
+
+#include <functional>
+#include <type_traits>
+
+namespace cru::platform::graph::util {
+template <typename Fn>
+inline void WithTransform(IPainter* painter, const Matrix& matrix,
+                          const Fn& action) {
+  static_assert(std::is_invocable_v<decltype(action), IPainter*>,
+                "Action must can be be invoked with painter.");
+  const auto old = painter->GetTransform();
+  painter->SetTransform(old * matrix);
+  action(painter);
+  painter->SetTransform(old);
+}
+}  // namespace cru::platform::util
-- 
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