update example

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 "SkExample.h"
-
-#include "SkApplication.h"
-#include "SkDraw.h"
-#include "SkGradientShader.h"
-#include "SkGraphics.h"
-
-class HelloSkia : public SkExample {
-public:
-    HelloSkia(SkExampleWindow* window) : SkExample(window) {
-        fName = "HelloSkia";
-        fBGColor = SK_ColorWHITE;
-        fRotationAngle = SkIntToScalar(0);
-
-        fWindow->setupBackend(SkExampleWindow::kGPU_DeviceType);
-        // Another option is software rendering:
-        // fWindow->setupBackend(SkExampleWindow::kRaster_DeviceType);
-    }
-
-protected:
-    void draw(SkCanvas* canvas) {
-        // 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};
-
-            SkShader* shader = SkGradientShader::CreateLinear(
-                    linearPoints, linearColors, NULL, 2,
-                    SkShader::kMirror_TileMode);
-            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->fWindow->inval(NULL);
-    }
-
-private:
-    SkScalar fRotationAngle;
-    SkColor fBGColor;
-};
-
-static SkExample* MyFactory(SkExampleWindow* window) {
-    return new HelloSkia(window);
-}
-
-// Register this class as a Skia Example.
-SkExample::Registry registry(MyFactory);