1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8 #include "SampleCode.h"
9 #include "SkView.h"
10 #include "SkCanvas.h"
11 #include "SkDevice.h"
12 #include "SkPaint.h"
13 #include "SkUnitMappers.h"
14 #include "SkCubicInterval.h"
15
16 #include "SkWidgetViews.h"
17
make_textview(SkView * parent,const SkRect & bounds,const SkPaint & paint)18 static SkStaticTextView* make_textview(SkView* parent,
19 const SkRect& bounds,
20 const SkPaint& paint) {
21 SkStaticTextView* view = new SkStaticTextView;
22 view->setMode(SkStaticTextView::kFixedSize_Mode);
23 view->setPaint(paint);
24 view->setVisibleP(true);
25 view->setSize(bounds.width(), bounds.height());
26 view->setLoc(bounds.fLeft, bounds.fTop);
27 parent->attachChildToFront(view)->unref();
28 return view;
29 }
30
set_scalar(SkStaticTextView * view,SkScalar value)31 static void set_scalar(SkStaticTextView* view, SkScalar value) {
32 SkString str;
33 str.appendScalar(value);
34 view->setText(str);
35 }
36
37 class UnitMapperView : public SampleView {
38 SkPoint fPts[4];
39 SkMatrix fMatrix;
40 SkStaticTextView* fViews[4];
41
setViews()42 void setViews() {
43 set_scalar(fViews[0], fPts[1].fX);
44 set_scalar(fViews[1], fPts[1].fY);
45 set_scalar(fViews[2], fPts[2].fX);
46 set_scalar(fViews[3], fPts[2].fY);
47 }
48
49 public:
UnitMapperView()50 UnitMapperView() {
51 fPts[0].set(0, 0);
52 fPts[1].set(SK_Scalar1 / 3, SK_Scalar1 / 3);
53 fPts[2].set(SK_Scalar1 * 2 / 3, SK_Scalar1 * 2 / 3);
54 fPts[3].set(SK_Scalar1, SK_Scalar1);
55
56 fMatrix.setScale(SK_Scalar1 * 200, -SK_Scalar1 * 200);
57 fMatrix.postTranslate(SkIntToScalar(100), SkIntToScalar(300));
58
59 SkRect r = {
60 SkIntToScalar(350), SkIntToScalar(100),
61 SkIntToScalar(500), SkIntToScalar(130)
62 };
63 SkPaint paint;
64 paint.setAntiAlias(true);
65 paint.setTextSize(SkIntToScalar(25));
66 for (int i = 0; i < 4; i++) {
67 fViews[i] = make_textview(this, r, paint);
68 r.offset(0, r.height());
69 }
70 this->setViews();
71 }
72
73 protected:
74 // overrides from SkEventSink
onQuery(SkEvent * evt)75 virtual bool onQuery(SkEvent* evt) {
76 if (SampleCode::TitleQ(*evt)) {
77 SampleCode::TitleR(evt, "UnitMapper");
78 return true;
79 }
80 return this->INHERITED::onQuery(evt);
81 }
82
onDrawContent(SkCanvas * canvas)83 virtual void onDrawContent(SkCanvas* canvas) {
84 SkPaint paint;
85 paint.setAntiAlias(true);
86 paint.setColor(0xFF8888FF);
87
88 SkRect r = { 0, 0, SK_Scalar1, SK_Scalar1 };
89
90 canvas->concat(fMatrix);
91 canvas->drawRect(r, paint);
92
93 paint.setColor(SK_ColorBLACK);
94 paint.setStyle(SkPaint::kStroke_Style);
95 paint.setStrokeWidth(0);
96 paint.setStrokeCap(SkPaint::kRound_Cap);
97
98 SkPath path;
99 path.moveTo(fPts[0]);
100 path.cubicTo(fPts[1], fPts[2], fPts[3]);
101 canvas->drawPath(path, paint);
102
103 paint.setColor(SK_ColorRED);
104 paint.setStrokeWidth(0);
105 canvas->drawLine(0, 0, SK_Scalar1, SK_Scalar1, paint);
106
107 paint.setColor(SK_ColorBLUE);
108 paint.setStrokeWidth(SK_Scalar1 / 60);
109 for (int i = 0; i < 50; i++) {
110 SkScalar x = i * SK_Scalar1 / 49;
111 canvas->drawPoint(x, SkEvalCubicInterval(&fPts[1], x), paint);
112 }
113
114 paint.setStrokeWidth(SK_Scalar1 / 20);
115 paint.setColor(SK_ColorGREEN);
116 canvas->drawPoints(SkCanvas::kPoints_PointMode, 2, &fPts[1], paint);
117 }
118
invertPt(SkScalar x,SkScalar y)119 SkPoint invertPt(SkScalar x, SkScalar y) {
120 SkPoint pt;
121 SkMatrix m;
122 fMatrix.invert(&m);
123 m.mapXY(x, y, &pt);
124 return pt;
125 }
126
hittest(SkScalar x,SkScalar y)127 int hittest(SkScalar x, SkScalar y) {
128 SkPoint target = { x, y };
129 SkPoint pts[2] = { fPts[1], fPts[2] };
130 fMatrix.mapPoints(pts, 2);
131 for (int i = 0; i < 2; i++) {
132 if (SkPoint::Distance(pts[i], target) < SkIntToScalar(4)) {
133 return i + 1;
134 }
135 }
136 return -1;
137 }
138
onFindClickHandler(SkScalar x,SkScalar y)139 virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
140 fDragIndex = hittest(x, y);
141 return fDragIndex >= 0 ? new Click(this) : NULL;
142 }
143
onClick(Click * click)144 virtual bool onClick(Click* click) {
145 if (fDragIndex >= 0) {
146 fPts[fDragIndex] = invertPt(click->fCurr.fX, click->fCurr.fY);
147 this->setViews();
148 this->inval(NULL);
149 return true;
150 }
151 return false;
152 }
153
154 private:
155 int fDragIndex;
156
157 typedef SampleView INHERITED;
158 };
159
160 //////////////////////////////////////////////////////////////////////////////
161
MyFactory()162 static SkView* MyFactory() { return new UnitMapperView; }
163 static SkViewRegister reg(MyFactory);
164
165