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      1 /*
      2  * Copyright 2013 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 "SkCanvas.h"
     10 #include "SkPath.h"
     11 
     12 namespace skiagm {
     13 
     14 static SkPath generate_square(SkScalar cx, SkScalar cy, SkScalar w) {
     15     SkRect rect = SkRect::MakeXYWH(cx - w / 2, cy - w / 2, w, w);
     16     SkPath path;
     17     path.addRect(rect);
     18     return path;
     19 }
     20 
     21 static SkPath generate_rect_line(SkScalar cx, SkScalar cy, SkScalar l) {
     22     SkRect rect = SkRect::MakeXYWH(cx - l / 2, cy, l, 0);
     23     SkPath path;
     24     path.addRect(rect);
     25     return path;
     26 }
     27 
     28 static SkPath generate_circle(SkScalar cx, SkScalar cy, SkScalar d) {
     29     SkPath path;
     30     path.addCircle(cx, cy, d/2, SkPath::kCW_Direction);
     31     return path;
     32 }
     33 
     34 static SkPath generate_line(SkScalar cx, SkScalar cy, SkScalar l) {
     35     SkPath path;
     36     path.moveTo(cx - l / 2, cy);
     37     path.lineTo(cx + l / 2, cy);
     38     return path;
     39 }
     40 
     41 SkPaint::Style styles[] = {
     42         SkPaint::kStroke_Style,
     43         SkPaint::kStrokeAndFill_Style,
     44         SkPaint::kFill_Style
     45 };
     46 SkScalar pathSizes[] = {
     47         40,
     48         10,
     49         0
     50 };
     51 SkScalar strokeWidths[] = {
     52         10,
     53         0
     54 };
     55 SkPath ((*paths[])(SkScalar, SkScalar, SkScalar)) = {
     56         generate_square,
     57         generate_rect_line,
     58         generate_circle,
     59         generate_line
     60 };
     61 
     62 const SkScalar slideWidth = 90, slideHeight = 90;
     63 const SkScalar slideBoundary = 5;
     64 
     65 
     66 class InversePathsGM : public GM {
     67 public:
     68     InversePathsGM() {
     69 
     70     }
     71 
     72 protected:
     73     virtual SkString onShortName() {
     74         return SkString("inverse_paths");
     75     }
     76 
     77     virtual SkISize onISize() {
     78         return make_isize(800, 900);
     79     }
     80 
     81     virtual void onDraw(SkCanvas* canvas) {
     82         SkScalar cx = slideWidth / 2 + slideBoundary;
     83         SkScalar cy = slideHeight / 2 + slideBoundary;
     84         SkScalar dx = slideWidth + 2 * slideBoundary;
     85         SkScalar dy = slideHeight + 2 * slideBoundary;
     86 
     87         SkRect clipRect = SkRect::MakeLTRB(slideBoundary, slideBoundary,
     88                                            slideBoundary + slideWidth,
     89                                            slideBoundary + slideHeight);
     90         SkPaint clipPaint;
     91         clipPaint.setStyle(SkPaint::kStroke_Style);
     92         clipPaint.setStrokeWidth(SkIntToScalar(2));
     93 
     94         SkPaint outlinePaint;
     95         outlinePaint.setColor(0x40000000);
     96         outlinePaint.setStyle(SkPaint::kStroke_Style);
     97         outlinePaint.setStrokeWidth(SkIntToScalar(0));
     98 
     99         for (size_t styleIndex = 0; styleIndex < SK_ARRAY_COUNT(styles);
    100                 styleIndex++) {
    101             for (size_t sizeIndex = 0; sizeIndex < SK_ARRAY_COUNT(pathSizes);
    102                     sizeIndex++) {
    103                 SkScalar size = pathSizes[sizeIndex];
    104 
    105                 canvas->save();
    106 
    107                 for (size_t widthIndex = 0;
    108                         widthIndex < SK_ARRAY_COUNT(strokeWidths);
    109                         widthIndex++) {
    110                     SkPaint paint;
    111                     paint.setColor(0xff007000);
    112                     paint.setStrokeWidth(strokeWidths[widthIndex]);
    113                     paint.setStyle(styles[styleIndex]);
    114 
    115                     for (size_t pathIndex = 0;
    116                             pathIndex < SK_ARRAY_COUNT(paths);
    117                             pathIndex++) {
    118                         canvas->drawRect(clipRect, clipPaint);
    119 
    120                         canvas->save();
    121                         canvas->clipRect(clipRect);
    122 
    123                         SkPath path = paths[pathIndex](cx, cy, size);
    124                         path.setFillType(SkPath::kInverseWinding_FillType);
    125                         canvas->drawPath(path, paint);
    126 
    127                         path.setFillType(SkPath::kWinding_FillType);
    128                         canvas->drawPath(path, outlinePaint);
    129 
    130                         canvas->restore();
    131                         canvas->translate(dx, 0);
    132                     }
    133                 }
    134 
    135                 canvas->restore();
    136                 canvas->translate(0, dy);
    137             }
    138         }
    139     }
    140 
    141 private:
    142     typedef GM INHERITED;
    143 };
    144 
    145 DEF_GM( return new InversePathsGM; )
    146 }
    147