SampleCamera.cpp revision d15750c0c7766ecab7022ea9b2f9e89a9132cbc2 
1/*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "DecodeFile.h"
9#include "SampleCode.h"
10#include "SkAnimTimer.h"
11#include "SkView.h"
12#include "SkCanvas.h"
13#include "SkCamera.h"
14#include "SkEmbossMaskFilter.h"
15#include "SkGradientShader.h"
16#include "SkPath.h"
17#include "SkRegion.h"
18#include "SkShader.h"
19#include "SkUtils.h"
20#include "SkRandom.h"
21
22class CameraView : public SampleView {
23    SkTDArray<SkShader*> fShaders;
24    int     fShaderIndex;
25    bool    fFrontFace;
26public:
27    CameraView() {
28        fRX = fRY = fRZ = 0;
29        fShaderIndex = 0;
30        fFrontFace = false;
31
32        for (int i = 0;; i++) {
33            SkString str;
34            str.printf("/skimages/elephant%d.jpeg", i);
35            SkBitmap bm;
36            if (decode_file(str.c_str(), &bm)) {
37                SkRect src = { 0, 0, SkIntToScalar(bm.width()), SkIntToScalar(bm.height()) };
38                SkRect dst = { -150, -150, 150, 150 };
39                SkMatrix matrix;
40                matrix.setRectToRect(src, dst, SkMatrix::kFill_ScaleToFit);
41
42                SkShader* s = SkShader::MakeBitmapShader(bm,
43                                                           SkShader::kClamp_TileMode,
44                                                           SkShader::kClamp_TileMode,
45                                                           &matrix).release();
46                *fShaders.append() = s;
47            } else {
48                break;
49            }
50        }
51        this->setBGColor(0xFFDDDDDD);
52    }
53
54    virtual ~CameraView() {
55        fShaders.unrefAll();
56    }
57
58protected:
59    // overrides from SkEventSink
60    bool onQuery(SkEvent* evt) override {
61        if (SampleCode::TitleQ(*evt)) {
62            SampleCode::TitleR(evt, "Camera");
63            return true;
64        }
65        return this->INHERITED::onQuery(evt);
66    }
67
68    void onDrawContent(SkCanvas* canvas) override {
69        canvas->translate(this->width()/2, this->height()/2);
70
71        Sk3DView    view;
72        view.rotateX(fRX);
73        view.rotateY(fRY);
74        view.applyToCanvas(canvas);
75
76        SkPaint paint;
77        if (fShaders.count() > 0) {
78            bool frontFace = view.dotWithNormal(0, 0, SK_Scalar1) < 0;
79            if (frontFace != fFrontFace) {
80                fFrontFace = frontFace;
81                fShaderIndex = (fShaderIndex + 1) % fShaders.count();
82            }
83
84            paint.setAntiAlias(true);
85            paint.setShader(fShaders[fShaderIndex]);
86            paint.setFilterQuality(kLow_SkFilterQuality);
87            SkRect r = { -150, -150, 150, 150 };
88            canvas->drawRoundRect(r, 30, 30, paint);
89        }
90    }
91
92    bool onAnimate(const SkAnimTimer& timer) override {
93        if (timer.isStopped()) {
94            fRY = 0;
95        } else {
96            fRY = timer.scaled(90, 360);
97        }
98        return true;
99    }
100
101private:
102    SkScalar fRX, fRY, fRZ;
103    typedef SampleView INHERITED;
104};
105
106//////////////////////////////////////////////////////////////////////////////
107
108static SkView* MyFactory() { return new CameraView; }
109static SkViewRegister reg(MyFactory);
110