change android icon, move code so .cpp and implement stroke preview using Stroke class for accurate preview.

android/CMakeLists.txt

@@ -37,6 +37,8 @@ add_library(
 	../engine/shape.cpp
 	../engine/layout.cpp
 	../engine/app.cpp
+	../engine/brush.cpp
+	../engine/canvas.cpp
 )
 
 target_include_directories(native-lib PRIVATE

android/build.gradle

@@ -28,7 +28,9 @@ android {
                 // Sets a flag to enable format macro constants for the C++ compiler.
                 //cppFlags "-D__STDC_FORMAT_MACROS"
                 arguments '-DANDROID_PLATFORM=android-19',
-                    '-DANDROID_TOOLCHAIN=clang', '-DANDROID_STL=gnustl_static'
+                    '-DANDROID_TOOLCHAIN=clang', 
+                    '-DANDROID_STL=gnustl_static',
+                    '-DCMAKE_BUILD_TYPE=Debug'
             }
         }
         ndk {

android/src/main/cpp/main.cpp

@@ -167,6 +167,10 @@ static void engine_draw_frame(struct engine* engine) {
     if (engine->display == NULL)
         return;
 
+    glClearColor(.1f, .1f, .1f, 1.f);
+    glViewport(0, 0, (GLsizei)engine->width, (GLsizei)engine->height);
+    glClear(GL_COLOR_BUFFER_BIT);
+
     App::I.update(0);
 
     eglSwapBuffers(engine->display, engine->surface);

android/src/main/res/values/strings.xml

@@ -1,4 +1,4 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <string name="app_name">LayoutEngine</string>
+    <string name="app_name">PanoPainter</string>
 </resources>