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      1 /*
      2  * Copyright 2012 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 #include "gm.h"
      8 #include "SkCanvas.h"
      9 #include "SkPaint.h"
     10 #include "Sk1DPathEffect.h"
     11 #include "Sk2DPathEffect.h"
     12 #include "SkCornerPathEffect.h"
     13 #include "SkDashPathEffect.h"
     14 #include "SkDiscretePathEffect.h"
     15 
     16 namespace skiagm {
     17 
     18 static void compose_pe(SkPaint* paint) {
     19     SkPathEffect* pe = paint->getPathEffect();
     20     SkPathEffect* corner = SkCornerPathEffect::Create(25);
     21     SkPathEffect* compose;
     22     if (pe) {
     23         compose = SkComposePathEffect::Create(pe, corner);
     24         corner->unref();
     25     } else {
     26         compose = corner;
     27     }
     28     paint->setPathEffect(compose)->unref();
     29 }
     30 
     31 static void hair_pe(SkPaint* paint) {
     32     paint->setStrokeWidth(0);
     33 }
     34 
     35 static void hair2_pe(SkPaint* paint) {
     36     paint->setStrokeWidth(0);
     37     compose_pe(paint);
     38 }
     39 
     40 static void stroke_pe(SkPaint* paint) {
     41     paint->setStrokeWidth(12);
     42     compose_pe(paint);
     43 }
     44 
     45 static void dash_pe(SkPaint* paint) {
     46     SkScalar inter[] = { 20, 10, 10, 10 };
     47     paint->setStrokeWidth(12);
     48     paint->setPathEffect(SkDashPathEffect::Create(inter, SK_ARRAY_COUNT(inter),
     49                                                   0))->unref();
     50     compose_pe(paint);
     51 }
     52 
     53 static const int gXY[] = {
     54 4, 0, 0, -4, 8, -4, 12, 0, 8, 4, 0, 4
     55 };
     56 
     57 static void scale(SkPath* path, SkScalar scale) {
     58     SkMatrix m;
     59     m.setScale(scale, scale);
     60     path->transform(m);
     61 }
     62 
     63 static void one_d_pe(SkPaint* paint) {
     64     SkPath  path;
     65     path.moveTo(SkIntToScalar(gXY[0]), SkIntToScalar(gXY[1]));
     66     for (unsigned i = 2; i < SK_ARRAY_COUNT(gXY); i += 2)
     67         path.lineTo(SkIntToScalar(gXY[i]), SkIntToScalar(gXY[i+1]));
     68     path.close();
     69     path.offset(SkIntToScalar(-6), 0);
     70     scale(&path, 1.5f);
     71 
     72     paint->setPathEffect(SkPath1DPathEffect::Create(path, SkIntToScalar(21), 0,
     73                                 SkPath1DPathEffect::kRotate_Style))->unref();
     74     compose_pe(paint);
     75 }
     76 
     77 typedef void (*PE_Proc)(SkPaint*);
     78 static const PE_Proc gPE[] = { hair_pe, hair2_pe, stroke_pe, dash_pe, one_d_pe };
     79 
     80 static void fill_pe(SkPaint* paint) {
     81     paint->setStyle(SkPaint::kFill_Style);
     82     paint->setPathEffect(nullptr);
     83 }
     84 
     85 static void discrete_pe(SkPaint* paint) {
     86     paint->setPathEffect(SkDiscretePathEffect::Create(10, 4))->unref();
     87 }
     88 
     89 static SkPathEffect* MakeTileEffect() {
     90     SkMatrix m;
     91     m.setScale(SkIntToScalar(12), SkIntToScalar(12));
     92 
     93     SkPath path;
     94     path.addCircle(0, 0, SkIntToScalar(5));
     95 
     96     return SkPath2DPathEffect::Create(m, path);
     97 }
     98 
     99 static void tile_pe(SkPaint* paint) {
    100     paint->setPathEffect(MakeTileEffect())->unref();
    101 }
    102 
    103 static const PE_Proc gPE2[] = { fill_pe, discrete_pe, tile_pe };
    104 
    105 class PathEffectGM : public GM {
    106 public:
    107     PathEffectGM() {}
    108 
    109 protected:
    110 
    111     SkString onShortName() override {
    112         return SkString("patheffect");
    113     }
    114 
    115     SkISize onISize() override { return SkISize::Make(800, 600); }
    116 
    117     void onDraw(SkCanvas* canvas) override {
    118         SkPaint paint;
    119         paint.setAntiAlias(true);
    120         paint.setStyle(SkPaint::kStroke_Style);
    121 
    122         SkPath path;
    123         path.moveTo(20, 20);
    124         path.lineTo(70, 120);
    125         path.lineTo(120, 30);
    126         path.lineTo(170, 80);
    127         path.lineTo(240, 50);
    128 
    129         size_t i;
    130         canvas->save();
    131         for (i = 0; i < SK_ARRAY_COUNT(gPE); i++) {
    132             gPE[i](&paint);
    133             canvas->drawPath(path, paint);
    134             canvas->translate(0, 75);
    135         }
    136         canvas->restore();
    137 
    138         path.reset();
    139         SkRect r = { 0, 0, 250, 120 };
    140         path.addOval(r, SkPath::kCW_Direction);
    141         r.inset(50, 50);
    142         path.addRect(r, SkPath::kCCW_Direction);
    143 
    144         canvas->translate(320, 20);
    145         for (i = 0; i < SK_ARRAY_COUNT(gPE2); i++) {
    146             gPE2[i](&paint);
    147             canvas->drawPath(path, paint);
    148             canvas->translate(0, 160);
    149         }
    150 
    151         SkIRect rect = SkIRect::MakeXYWH(20, 20, 60, 60);
    152         for (i = 0; i < SK_ARRAY_COUNT(gPE); i++) {
    153             SkPaint p;
    154             p.setAntiAlias(true);
    155             p.setStyle(SkPaint::kFill_Style);
    156             gPE[i](&p);
    157             canvas->drawIRect(rect, p);
    158             canvas->translate(75, 0);
    159         }
    160     }
    161 
    162 private:
    163     typedef GM INHERITED;
    164 };
    165 
    166 //////////////////////////////////////////////////////////////////////////////
    167 
    168 static GM* PathEffectFactory(void*) { return new PathEffectGM; }
    169 static GMRegistry regPathEffect(PathEffectFactory);
    170 
    171 }
    172