skia2/samplecode/SampleDegenerateTwoPtRadials.cpp

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Automatic update of all copyright notices to reflect new license terms. I have manually examined all of these diffs and restored a few files that seem to require manual adjustment. The following files still need to be modified manually, in a separate CL: android_sample/SampleApp/AndroidManifest.xml android_sample/SampleApp/res/layout/layout.xml android_sample/SampleApp/res/menu/sample.xml android_sample/SampleApp/res/values/strings.xml android_sample/SampleApp/src/com/skia/sampleapp/SampleApp.java android_sample/SampleApp/src/com/skia/sampleapp/SampleView.java experimental/CiCarbonSampleMain.c experimental/CocoaDebugger/main.m experimental/FileReaderApp/main.m experimental/SimpleCocoaApp/main.m experimental/iOSSampleApp/Shared/SkAlertPrompt.h experimental/iOSSampleApp/Shared/SkAlertPrompt.m experimental/iOSSampleApp/SkiOSSampleApp-Base.xcconfig experimental/iOSSampleApp/SkiOSSampleApp-Debug.xcconfig experimental/iOSSampleApp/SkiOSSampleApp-Release.xcconfig gpu/src/android/GrGLDefaultInterface_android.cpp gyp/common.gypi gyp_skia include/ports/SkHarfBuzzFont.h include/views/SkOSWindow_wxwidgets.h make.bat make.py src/opts/memset.arm.S src/opts/memset16_neon.S src/opts/memset32_neon.S src/opts/opts_check_arm.cpp src/ports/SkDebug_brew.cpp src/ports/SkMemory_brew.cpp src/ports/SkOSFile_brew.cpp src/ports/SkXMLParser_empty.cpp src/utils/ios/SkImageDecoder_iOS.mm src/utils/ios/SkOSFile_iOS.mm src/utils/ios/SkStream_NSData.mm tests/FillPathTest.cpp Review URL: http://codereview.appspot.com/4816058 git-svn-id: http://skia.googlecode.com/svn/trunk@1982 2bbb7eff-a529-9590-31e7-b0007b416f81
2011-07-28 14:26:00 +00:00
/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkCanvas.h"
#include "include/core/SkFont.h"
#include "include/core/SkString.h"
#include "include/effects/SkGradientShader.h"
#include "samplecode/Sample.h"
static void draw_gradient2(SkCanvas* canvas, const SkRect& rect, SkScalar delta) {
SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorMAGENTA };
SkScalar pos[] = { 0, 0.25f, 0.75f, SK_Scalar1 };
SkScalar l = rect.fLeft;
SkScalar t = rect.fTop;
SkScalar w = rect.width();
SkScalar h = rect.height();
SkASSERT(0 == SkScalarMod(w, SK_Scalar1 * 5));
SkPoint c0 = { l + 2 * w / 5 + delta, t + h / 2 };
SkPoint c1 = { l + 3 * w / 5, t + h / 2 };
SkScalar r0 = w / 5;
SkScalar r1 = 2 * w / 5;
SkPaint paint;
paint.setShader(SkGradientShader::MakeTwoPointConical(c0, r0, c1, r1, colors,
pos, SK_ARRAY_COUNT(pos),
SkTileMode::kClamp));
canvas->drawRect(rect, paint);
}
class DegenerateTwoPtRadialsView : public Sample {
public:
DegenerateTwoPtRadialsView() {
fTime = 0;
this->setBGColor(0xFFDDDDDD);
}
protected:
SkString name() override { return SkString("DegenerateTwoPtRadials"); }
void onDrawContent(SkCanvas* canvas) override {
SkScalar delta = fTime / 15.f;
int intPart = SkScalarFloorToInt(delta);
delta = delta - SK_Scalar1 * intPart;
if (intPart % 2) {
delta = SK_Scalar1 - delta;
}
delta -= SK_ScalarHalf;
static const int DELTA_SCALE = 500;
delta /= DELTA_SCALE;
SkScalar w = SK_Scalar1 * 500;
SkScalar h = SK_Scalar1 * 500;
SkScalar l = SK_Scalar1 * 100;
SkScalar t = SK_Scalar1 * 100;
draw_gradient2(canvas, SkRect::MakeXYWH(l, t, w, h), delta);
SkString txt;
txt.appendf("gap at \"tangent\" pt = %f", SkScalarToFloat(delta));
canvas->drawString(txt, l + w / 2 + w * DELTA_SCALE * delta, t + h + SK_Scalar1 * 10,
SkFont(), SkPaint());
}
bool onAnimate(double nanos) override {
fTime = SkDoubleToScalar(1e-9 * nanos / 15);
return true;
}
private:
SkScalar fTime;
typedef Sample INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_SAMPLE( return new DegenerateTwoPtRadialsView(); )