2 files changed, 48 insertions, 4 deletions
diff --git a/include/cru/platform/graphics/web_canvas/WebCanvasPainter.h b/include/cru/platform/graphics/web_canvas/WebCanvasPainter.h
index f85f93b0..cd885aa4 100644
--- a/include/cru/platform/graphics/web_canvas/WebCanvasPainter.h
+++ b/include/cru/platform/graphics/web_canvas/WebCanvasPainter.h
@@ -3,10 +3,22 @@
 #include "WebCanvasResource.h"
 
 #include <emscripten/val.h>
+#include <optional>
 
 namespace cru::platform::graphics::web_canvas {
-class WebCanvasPainter: public WebCanvasResource, public virtual IPainter {
-  public:
-    WebCanvasPainter(WebCanvasGraphicsFactory* factory, emscripten::val context);
+class WebCanvasPainter : public WebCanvasResource, public virtual IPainter {
+ public:
+  WebCanvasPainter(WebCanvasGraphicsFactory* factory, emscripten::val context,
+                   std::optional<Matrix> init_transform = std::nullopt);
+
+  ~WebCanvasPainter() override;
+
+ public:
+  Matrix GetTransform() override;
+  void SetTransform(const Matrix& transform) override;
+
+ private:
+  Matrix current_transform_;
+  emscripten::val context_;
 };
-}
+}  // namespace cru::platform::graphics::web_canvas
diff --git a/src/platform/graphics/web_canvas/Painter.cpp b/src/platform/graphics/web_canvas/Painter.cpp
index fd196256..cd04a725 100644
--- a/src/platform/graphics/web_canvas/Painter.cpp
+++ b/src/platform/graphics/web_canvas/Painter.cpp
@@ -1 +1,33 @@
+#include "cru/platform/graphics/web_canvas/WebCanvasGraphicsFactory.h"
 #include "cru/platform/graphics/web_canvas/WebCanvasPainter.h"
+#include "cru/platform/graphics/web_canvas/WebCanvasResource.h"
+
+#include <optional>
+
+namespace cru::platform::graphics::web_canvas {
+
+namespace {
+void contextSetTransform(emscripten::val context, const Matrix& matrix) {
+  context.call<void>("setTransform", matrix.m11, matrix.m12, matrix.m21,
+                     matrix.m22, matrix.m31, matrix.m32);
+}
+}  // namespace
+
+WebCanvasPainter::WebCanvasPainter(WebCanvasGraphicsFactory* factory,
+                                   emscripten::val context,
+                                   std::optional<Matrix> current_transform)
+    : WebCanvasResource(factory),
+      context_(context),
+      current_transform_(current_transform.value_or(Matrix::Identity())) {
+  contextSetTransform(context_, current_transform_);
+}
+
+WebCanvasPainter::~WebCanvasPainter() {}
+
+Matrix WebCanvasPainter::GetTransform() { return current_transform_; }
+
+void WebCanvasPainter::SetTransform(const Matrix& transform) {
+  current_transform_ = transform;
+  contextSetTransform(context_, transform);
+}
+}  // namespace cru::platform::graphics::web_canvas