blob: 63b453b2409a1411caed8333ec66bc9f606d8317 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
|
/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SampleCode.h"
#include "SkAnimTimer.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkUtils.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkImage.h"
#include "SkRandom.h"
#include "SkSystemEventTypes.h"
#include "SkTime.h"
#include "SkTypeface.h"
#include "Timer.h"
#if SK_SUPPORT_GPU
#include "GrContext.h"
#endif
class FlutterAnimateView : public SampleView {
public:
FlutterAnimateView() : fCurrTime(0), fResetTime(0) {}
protected:
void onOnceBeforeDraw() override {
initChars();
}
// overrides from SkEventSink
bool onQuery(SkEvent* evt) override {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "FlutterAnimate");
return true;
}
return this->INHERITED::onQuery(evt);
}
void onDrawContent(SkCanvas* canvas) override {
SkPaint paint;
paint.setTypeface(SkTypeface::MakeFromFile("/skimages/samplefont.ttf"));
paint.setAntiAlias(true);
paint.setFilterQuality(kMedium_SkFilterQuality);
paint.setTextSize(50);
canvas->clear(SK_ColorWHITE);
for (int i = 0; i < kNumChars; ++i) {
canvas->save();
double rot = fChars[i].fStartRotation + (fChars[i].fEndRotation - fChars[i].fStartRotation)*fCurrTime/kDuration;
canvas->translate(fChars[i].fPosition.fX + 35,fChars[i].fPosition.fY - 50);
canvas->rotate(rot*180.0/SK_MScalarPI);
canvas->translate(-35,+50);
canvas->drawString(fChars[i].fChar, 0, 0,
paint);
canvas->restore();
}
}
bool onAnimate(const SkAnimTimer& timer) override {
fCurrTime = timer.secs() - fResetTime;
if (fCurrTime > kDuration) {
this->initChars();
fResetTime = timer.secs();
fCurrTime = 0;
}
return true;
}
private:
void initChars() {
for (int i = 0; i < kNumChars; ++i) {
char c = fRand.nextULessThan(26) + 65;
fChars[i].fChar.set(&c, 1);
fChars[i].fPosition = SkPoint::Make(fRand.nextF()*748 + 10, fRand.nextF()*1004 + 10);
fChars[i].fStartRotation = fRand.nextF();
fChars[i].fEndRotation = fRand.nextF() * 20 - 10;
}
}
static constexpr double kDuration = 5.0;
double fCurrTime;
double fResetTime;
SkRandom fRand;
struct AnimatedChar {
SkString fChar;
SkPoint fPosition;
SkScalar fStartRotation;
SkScalar fEndRotation;
};
static constexpr int kNumChars = 40;
AnimatedChar fChars[kNumChars];
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new FlutterAnimateView; }
static SkViewRegister reg(MyFactory);
|
