SkiaExamples improvements.

experimental/SkiaExamples/HelloSkiaExample.cpp

-/*
- * Copyright 2013 Google Inc.
- *
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- *
- */
-
-#include "BaseExample.h"
-
-#include "SkApplication.h"
-#include "SkDraw.h"
-#include "SkGradientShader.h"
-#include "SkGraphics.h"
-#include "SkUnitMappers.h"
-
-class HelloSkia : public BaseExample {
-    public:
-        HelloSkia(void* hWnd, int argc, char** argv)
-            : INHERITED(hWnd, argc, argv)
-        {
-            fBGColor = SK_ColorWHITE;
-            fRotationAngle = SkIntToScalar(0);
-
-            setupBackend(kGPU_DeviceType);
-            // Another option is software rendering:
-            // setupBackend(kRaster_DeviceType);
-        }
-
-    protected:
-        virtual void draw(SkCanvas* canvas) SK_OVERRIDE {
-            // Clear background
-            canvas->drawColor(fBGColor);
-
-            SkPaint paint;
-            paint.setColor(SK_ColorRED);
-
-            // Draw a rectangle with blue paint
-            SkRect rect = {
-                SkIntToScalar(10), SkIntToScalar(10),
-                SkIntToScalar(128), SkIntToScalar(128)
-            };
-            canvas->drawRect(rect, paint);
-
-            // Set up a linear gradient and draw a circle
-            {
-                SkPoint linearPoints[] = {
-                    {SkIntToScalar(0), SkIntToScalar(0)},
-                    {SkIntToScalar(300), SkIntToScalar(300)}
-                };
-                SkColor linearColors[] = {SK_ColorGREEN, SK_ColorBLACK};
-
-                SkUnitMapper* linearMapper = new SkDiscreteMapper(100);
-                SkAutoUnref lm_deleter(linearMapper);
-
-                SkShader* shader = SkGradientShader::CreateLinear(
-                        linearPoints, linearColors, NULL, 2,
-                        SkShader::kMirror_TileMode, linearMapper);
-                SkAutoUnref shader_deleter(shader);
-
-                paint.setShader(shader);
-                paint.setFlags(SkPaint::kAntiAlias_Flag);
-
-                canvas->drawCircle(SkIntToScalar(200), SkIntToScalar(200),
-                                   SkIntToScalar(64), paint);
-
-                // Detach shader
-                paint.setShader(NULL);
-            }
-
-
-            // Draw a message with a nice black paint.
-            paint.setFlags(
-                    SkPaint::kAntiAlias_Flag |
-                    SkPaint::kSubpixelText_Flag |  // ... avoid waggly text when rotating.
-                    SkPaint::kUnderlineText_Flag);
-            paint.setColor(SK_ColorBLACK);
-            paint.setTextSize(SkIntToScalar(20));
-
-            canvas->save();
-
-            static const char message[] = "Hello Skia!!!";
-
-            // Translate and rotate
-            canvas->translate(SkIntToScalar(300), SkIntToScalar(300));
-            fRotationAngle += SkDoubleToScalar(0.2);
-            if (fRotationAngle > SkDoubleToScalar(360.0)) {
-                fRotationAngle -= SkDoubleToScalar(360.0);
-            }
-            canvas->rotate(fRotationAngle);
-
-            // Draw the text:
-            canvas->drawText(message, strlen(message), SkIntToScalar(0), SkIntToScalar(0), paint);
-
-            canvas->restore();
-
-            // Invalidate the window to force a redraw. Poor man's animation mechanism.
-            this->inval(NULL);
-
-            INHERITED::draw(canvas);
-        }
-
-    private:
-        SkScalar fRotationAngle;
-        SkColor fBGColor;
-        typedef BaseExample INHERITED;
-};
-
-SkOSWindow* create_sk_window(void* hwnd, int argc, char** argv) {
-    return new HelloSkia(hwnd, argc, argv);
-}