docs/examples/Path_incReserve.cpp

// Copyright 2019 Google LLC.
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
#include "tools/fiddle/examples.h"
REG_FIDDLE(Path_incReserve, 256, 192, false, 0) {
void draw(SkCanvas* canvas) {
    auto addPoly = [](int sides, SkScalar size, SkPathBuilder* path) -> void {
        path->moveTo(size, 0);
        for (int i = 1; i < sides; i++) {
            SkScalar rad = SK_ScalarPI * 2 * i / sides;
            path->lineTo(SkScalarCos(rad) * size, SkScalarSin(rad) * size);
        }
        path->close();
    };
    SkPathBuilder path;
    path.incReserve(3 + 4 + 5 + 6 + 7 + 8 + 9);
    for (int sides = 3; sides < 10; ++sides) {
       addPoly(sides, sides, &path);
    }
    SkMatrix matrix;
    matrix.setScale(10, 10, -10, -10);
    path.transform(matrix);
    SkPaint paint;
    paint.setStyle(SkPaint::kStroke_Style);
    canvas->drawPath(path.detach(), paint);
}
}  // END FIDDLE