43f2b2c833
Make it possible for a client to write a Hello World in less than 50 lines. R=caryclark@google.com Review URL: https://codereview.chromium.org/18574002 git-svn-id: http://skia.googlecode.com/svn/trunk@10319 2bbb7eff-a529-9590-31e7-b0007b416f81
111 lines
3.2 KiB
C++
111 lines
3.2 KiB
C++
/*
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* Copyright 2013 Google Inc.
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*
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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*/
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#include "SkExample.h"
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#include "SkApplication.h"
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#include "SkDraw.h"
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#include "SkGradientShader.h"
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#include "SkGraphics.h"
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#include "SkUnitMappers.h"
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class HelloSkia : public SkExample {
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public:
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HelloSkia(SkExampleWindow* window) : SkExample(window) {
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fName = "HelloSkia";
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fBGColor = SK_ColorWHITE;
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fRotationAngle = SkIntToScalar(0);
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fWindow->setupBackend(SkExampleWindow::kGPU_DeviceType);
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// Another option is software rendering:
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// setupBackend(SkExampleWindow::kRaster_DeviceType);
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}
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protected:
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void draw(SkCanvas* canvas) {
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// Clear background
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canvas->drawColor(fBGColor);
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SkPaint paint;
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paint.setColor(SK_ColorRED);
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// Draw a rectangle with blue paint
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SkRect rect = {
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SkIntToScalar(10), SkIntToScalar(10),
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SkIntToScalar(128), SkIntToScalar(128)
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};
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canvas->drawRect(rect, paint);
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// Set up a linear gradient and draw a circle
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{
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SkPoint linearPoints[] = {
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{SkIntToScalar(0), SkIntToScalar(0)},
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{SkIntToScalar(300), SkIntToScalar(300)}
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};
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SkColor linearColors[] = {SK_ColorGREEN, SK_ColorBLACK};
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SkUnitMapper* linearMapper = new SkDiscreteMapper(100);
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SkAutoUnref lm_deleter(linearMapper);
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SkShader* shader = SkGradientShader::CreateLinear(
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linearPoints, linearColors, NULL, 2,
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SkShader::kMirror_TileMode, linearMapper);
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SkAutoUnref shader_deleter(shader);
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paint.setShader(shader);
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paint.setFlags(SkPaint::kAntiAlias_Flag);
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canvas->drawCircle(SkIntToScalar(200), SkIntToScalar(200),
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SkIntToScalar(64), paint);
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// Detach shader
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paint.setShader(NULL);
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}
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// Draw a message with a nice black paint.
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paint.setFlags(
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SkPaint::kAntiAlias_Flag |
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SkPaint::kSubpixelText_Flag | // ... avoid waggly text when rotating.
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SkPaint::kUnderlineText_Flag);
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paint.setColor(SK_ColorBLACK);
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paint.setTextSize(SkIntToScalar(20));
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canvas->save();
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static const char message[] = "Hello Skia!!!";
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// Translate and rotate
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canvas->translate(SkIntToScalar(300), SkIntToScalar(300));
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fRotationAngle += SkDoubleToScalar(0.2);
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if (fRotationAngle > SkDoubleToScalar(360.0)) {
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fRotationAngle -= SkDoubleToScalar(360.0);
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}
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canvas->rotate(fRotationAngle);
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// Draw the text:
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canvas->drawText(message, strlen(message), SkIntToScalar(0), SkIntToScalar(0), paint);
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canvas->restore();
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// Invalidate the window to force a redraw. Poor man's animation mechanism.
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this->fWindow->inval(NULL);
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}
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private:
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SkScalar fRotationAngle;
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SkColor fBGColor;
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};
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static SkExample* MyFactory(SkExampleWindow* window) {
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return new HelloSkia(window);
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}
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// Register this class as a Skia Example.
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SkExample::Registry registry(MyFactory);
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