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      1 /*
      2  * Copyright 2015 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 "gm.h"
      9 #include "SkPath.h"
     10 
     11 typedef SkScalar (*MakePathProc)(SkPath*);
     12 
     13 static SkScalar make_triangle(SkPath* path) {
     14     constexpr int gCoord[] = {
     15         10, 20, 15, 5, 30, 30
     16     };
     17     path->moveTo(SkIntToScalar(gCoord[0]), SkIntToScalar(gCoord[1]));
     18     path->lineTo(SkIntToScalar(gCoord[2]), SkIntToScalar(gCoord[3]));
     19     path->lineTo(SkIntToScalar(gCoord[4]), SkIntToScalar(gCoord[5]));
     20     path->close();
     21     path->offset(SkIntToScalar(10), SkIntToScalar(0));
     22     return SkIntToScalar(30);
     23 }
     24 
     25 static SkScalar make_rect(SkPath* path) {
     26     SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
     27                  SkIntToScalar(30), SkIntToScalar(30) };
     28     path->addRect(r);
     29     path->offset(SkIntToScalar(10), SkIntToScalar(0));
     30     return SkIntToScalar(30);
     31 }
     32 
     33 static SkScalar make_oval(SkPath* path) {
     34     SkRect r = { SkIntToScalar(10), SkIntToScalar(10),
     35                  SkIntToScalar(30), SkIntToScalar(30) };
     36     path->addOval(r);
     37     path->offset(SkIntToScalar(10), SkIntToScalar(0));
     38     return SkIntToScalar(30);
     39 }
     40 
     41 static SkScalar make_star(SkPath* path, int n) {
     42     const SkScalar c = SkIntToScalar(45);
     43     const SkScalar r = SkIntToScalar(20);
     44 
     45     SkScalar rad = -SK_ScalarPI / 2;
     46     const SkScalar drad = (n >> 1) * SK_ScalarPI * 2 / n;
     47 
     48     path->moveTo(c, c - r);
     49     for (int i = 1; i < n; i++) {
     50         rad += drad;
     51         SkScalar cosV, sinV = SkScalarSinCos(rad, &cosV);
     52         path->lineTo(c + cosV * r, c + sinV * r);
     53     }
     54     path->close();
     55     return r * 2 * 6 / 5;
     56 }
     57 
     58 static SkScalar make_star_5(SkPath* path) { return make_star(path, 5); }
     59 static SkScalar make_star_13(SkPath* path) { return make_star(path, 13); }
     60 
     61 static SkScalar make_three_line(SkPath* path) {
     62     static SkScalar xOffset = 34.f;
     63     static SkScalar yOffset = 50.f;
     64     path->moveTo(-32.5f + xOffset, 0.0f + yOffset);
     65     path->lineTo(32.5f + xOffset, 0.0f + yOffset);
     66 
     67     path->moveTo(-32.5f + xOffset, 19 + yOffset);
     68     path->lineTo(32.5f + xOffset, 19 + yOffset);
     69 
     70     path->moveTo(-32.5f + xOffset, -19 + yOffset);
     71     path->lineTo(32.5f + xOffset, -19 + yOffset);
     72     path->lineTo(-32.5f + xOffset, -19 + yOffset);
     73 
     74     path->close();
     75 
     76     return SkIntToScalar(70);
     77 }
     78 
     79 static SkScalar make_arrow(SkPath* path) {
     80     static SkScalar xOffset = 34.f;
     81     static SkScalar yOffset = 40.f;
     82     path->moveTo(-26.f + xOffset, 0.0f + yOffset);
     83     path->lineTo(26.f + xOffset, 0.0f + yOffset);
     84 
     85     path->moveTo(-28.f + xOffset, -2.4748745f + yOffset);
     86     path->lineTo(0 + xOffset, 25.525126f + yOffset);
     87 
     88     path->moveTo(-28.f + xOffset, 2.4748745f + yOffset);
     89     path->lineTo(0 + xOffset, -25.525126f + yOffset);
     90     path->lineTo(-28.f + xOffset, 2.4748745f + yOffset);
     91 
     92     path->close();
     93 
     94     return SkIntToScalar(70);
     95 }
     96 
     97 static SkScalar make_curve(SkPath* path) {
     98     static SkScalar xOffset = -382.f;
     99     static SkScalar yOffset = -50.f;
    100     path->moveTo(491 + xOffset, 56 + yOffset);
    101     path->conicTo(435.93292f + xOffset, 56.000031f + yOffset,
    102                   382.61078f + xOffset, 69.752716f + yOffset,
    103                   0.9920463f);
    104 
    105     return SkIntToScalar(40);
    106 }
    107 
    108 static SkScalar make_battery(SkPath* path) {
    109     static SkScalar xOffset = 5.f;
    110 
    111     path->moveTo(24.67f + xOffset, 0.33000004f);
    112     path->lineTo(8.3299999f + xOffset, 0.33000004f);
    113     path->lineTo(8.3299999f + xOffset, 5.3299999f);
    114     path->lineTo(0.33000004f + xOffset, 5.3299999f);
    115     path->lineTo(0.33000004f + xOffset, 50.669998f);
    116     path->lineTo(32.669998f + xOffset, 50.669998f);
    117     path->lineTo(32.669998f + xOffset, 5.3299999f);
    118     path->lineTo(24.67f + xOffset, 5.3299999f);
    119     path->lineTo(24.67f + xOffset, 0.33000004f);
    120     path->close();
    121 
    122     path->moveTo(25.727224f + xOffset, 12.886665f);
    123     path->lineTo(10.907918f + xOffset, 12.886665f);
    124     path->lineTo(7.5166659f + xOffset, 28.683645f);
    125     path->lineTo(14.810181f + xOffset, 28.683645f);
    126     path->lineTo(7.7024879f + xOffset, 46.135998f);
    127     path->lineTo(28.049999f + xOffset, 25.136419f);
    128     path->lineTo(16.854223f + xOffset, 25.136419f);
    129     path->lineTo(25.727224f + xOffset, 12.886665f);
    130     path->close();
    131     return SkIntToScalar(50);
    132 }
    133 
    134 static SkScalar make_battery2(SkPath* path) {
    135     static SkScalar xOffset = 5.f;
    136 
    137     path->moveTo(32.669998f + xOffset, 9.8640003f);
    138     path->lineTo(0.33000004f + xOffset, 9.8640003f);
    139     path->lineTo(0.33000004f + xOffset, 50.669998f);
    140     path->lineTo(32.669998f + xOffset, 50.669998f);
    141     path->lineTo(32.669998f + xOffset, 9.8640003f);
    142     path->close();
    143 
    144     path->moveTo(10.907918f + xOffset, 12.886665f);
    145     path->lineTo(25.727224f + xOffset, 12.886665f);
    146     path->lineTo(16.854223f + xOffset, 25.136419f);
    147     path->lineTo(28.049999f + xOffset, 25.136419f);
    148     path->lineTo(7.7024879f + xOffset, 46.135998f);
    149     path->lineTo(14.810181f + xOffset, 28.683645f);
    150     path->lineTo(7.5166659f + xOffset, 28.683645f);
    151     path->lineTo(10.907918f + xOffset, 12.886665f);
    152     path->close();
    153 
    154     return SkIntToScalar(70);
    155 }
    156 
    157 constexpr MakePathProc gProcs[] = {
    158     make_triangle,
    159     make_rect,
    160     make_oval,
    161     make_star_5,
    162     make_star_13,
    163     make_three_line,
    164     make_arrow,
    165     make_curve,
    166     make_battery,
    167     make_battery2
    168 };
    169 
    170 constexpr SkScalar gWidths[] = {
    171     2.0f,
    172     3.0f,
    173     4.0f,
    174     5.0f,
    175     6.0f,
    176     7.0f,
    177     7.0f,
    178     14.0f,
    179     0.0f,
    180     0.0f,
    181 };
    182 
    183 constexpr SkScalar gMiters[] = {
    184     2.0f,
    185     3.0f,
    186     3.0f,
    187     3.0f,
    188     4.0f,
    189     4.0f,
    190     4.0f,
    191     4.0f,
    192     4.0f,
    193     4.0f,
    194 };
    195 
    196 #define N   SK_ARRAY_COUNT(gProcs)
    197 
    198 // This GM tests out drawing small paths (i.e., for Ganesh, using the Distance
    199 // Field path renderer) which are filled, stroked and filledAndStroked. In
    200 // particular this ensures that any cache keys in use include the stroking
    201 // parameters.
    202 class SmallPathsGM : public skiagm::GM {
    203     SkPath  fPath[N];
    204     SkScalar fDY[N];
    205 protected:
    206     void onOnceBeforeDraw() override {
    207         for (size_t i = 0; i < N; i++) {
    208             fDY[i] = gProcs[i](&fPath[i]);
    209         }
    210     }
    211 
    212     SkString onShortName() override {
    213         return SkString("smallpaths");
    214     }
    215 
    216     SkISize onISize() override {
    217         return SkISize::Make(640, 480);
    218     }
    219 
    220     void onDraw(SkCanvas* canvas) override {
    221         SkPaint paint;
    222         paint.setAntiAlias(true);
    223 
    224         // first column: filled paths
    225         canvas->save();
    226         for (size_t i = 0; i < N; i++) {
    227             canvas->drawPath(fPath[i], paint);
    228             canvas->translate(SkIntToScalar(0), fDY[i]);
    229         }
    230         canvas->restore();
    231         canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
    232 
    233         // second column: stroked paths
    234         canvas->save();
    235         paint.setStyle(SkPaint::kStroke_Style);
    236         paint.setStrokeCap(SkPaint::kButt_Cap);
    237         for (size_t i = 0; i < N; i++) {
    238             paint.setStrokeWidth(gWidths[i]);
    239             paint.setStrokeMiter(gMiters[i]);
    240             canvas->drawPath(fPath[i], paint);
    241             canvas->translate(SkIntToScalar(0), fDY[i]);
    242         }
    243         canvas->restore();
    244         canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
    245 
    246         // third column: stroked paths with different widths
    247         canvas->save();
    248         paint.setStyle(SkPaint::kStroke_Style);
    249         paint.setStrokeCap(SkPaint::kButt_Cap);
    250         for (size_t i = 0; i < N; i++) {
    251             paint.setStrokeWidth(gWidths[i] + 2.0f);
    252             paint.setStrokeMiter(gMiters[i]);
    253             canvas->drawPath(fPath[i], paint);
    254             canvas->translate(SkIntToScalar(0), fDY[i]);
    255         }
    256         canvas->restore();
    257         canvas->translate(SkIntToScalar(120), SkIntToScalar(0));
    258 
    259         // fourth column: stroked and filled paths
    260         paint.setStyle(SkPaint::kStrokeAndFill_Style);
    261         paint.setStrokeCap(SkPaint::kButt_Cap);
    262         for (size_t i = 0; i < N; i++) {
    263             paint.setStrokeWidth(gWidths[i]);
    264             paint.setStrokeMiter(gMiters[i]);
    265             canvas->drawPath(fPath[i], paint);
    266             canvas->translate(SkIntToScalar(0), fDY[i]);
    267         }
    268 
    269     }
    270 
    271 private:
    272     typedef skiagm::GM INHERITED;
    273 };
    274 
    275 DEF_GM(return new SmallPathsGM;)
    276