thorvg/examples/Clipping.cpp

/*
 * Copyright (c) 2020 - 2025 the ThorVG project. All rights reserved.

 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:

 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include "Example.h"

/************************************************************************/
/* ThorVG Drawing Contents                                              */
/************************************************************************/

struct UserExample : tvgexam::Example
{
    void compose(tvg::Shape* star)
    {
        star->moveTo(199, 34);
        star->lineTo(253, 143);
        star->lineTo(374, 160);
        star->lineTo(287, 244);
        star->lineTo(307, 365);
        star->lineTo(199, 309);
        star->lineTo(97, 365);
        star->lineTo(112, 245);
        star->lineTo(26, 161);
        star->lineTo(146, 143);
        star->close();
    }

    bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
    {
        if (!canvas) return false;

        //Background
        auto shape = tvg::Shape::gen();
        shape->appendRect(0, 0, w, h);
        shape->fill(255, 255, 255);
        canvas->push(shape);

        {
            auto scene = tvg::Scene::gen();

            auto star1 = tvg::Shape::gen();
            compose(star1);
            star1->fill(255, 255, 0);
            star1->strokeFill(255 ,0, 0);
            star1->strokeWidth(10);

            //Move Star1
            star1->translate(-10, -10);

            // color/alpha/opacity are ignored for a clip object - no need to set them
            auto clipStar = tvg::Shape::gen();
            clipStar->appendCircle(200, 230, 110, 110);
            clipStar->translate(10, 10);

            star1->clip((clipStar));

            auto star2 = tvg::Shape::gen();
            compose(star2);
            star2->fill(0, 255, 255);
            star2->strokeFill(0 ,255, 0);
            star2->strokeWidth(10);
            star2->opacity(100);

            //Move Star2
            star2->translate(10, 40);

            // color/alpha/opacity are ignored for a clip object - no need to set them
            auto clip = tvg::Shape::gen();
            clip->appendCircle(200, 230, 130, 130);
            clip->translate(10, 10);

            scene->push(star1);
            scene->push(star2);

            //Clipping scene to shape
            scene->clip(clip);

            canvas->push(scene);
        }

        {
            auto star3 = tvg::Shape::gen();
            compose(star3);

            //Fill Gradient
            auto fill = tvg::LinearGradient::gen();
            fill->linear(100, 100, 300, 300);
            tvg::Fill::ColorStop colorStops[2];
            colorStops[0] = {0, 0, 0, 0, 255};
            colorStops[1] = {1, 255, 255, 255, 255};
            fill->colorStops(colorStops, 2);
            star3->fill(fill);

            star3->strokeFill(255 ,0, 0);
            star3->strokeWidth(10);
            star3->translate(400, 0);

            // color/alpha/opacity are ignored for a clip object - no need to set them
            auto clipRect = tvg::Shape::gen();
            clipRect->appendRect(500, 120, 200, 200);          //x, y, w, h
            clipRect->translate(20, 20);

            //Clipping scene to rect(shape)
            star3->clip(clipRect);

            canvas->push(star3);
        }

        {
            auto picture = tvg::Picture::gen();
            if (!tvgexam::verify(picture->load(EXAMPLE_DIR"/svg/cartman.svg"))) return false;

            picture->scale(3);
            picture->translate(50, 400);

            // color/alpha/opacity are ignored for a clip object - no need to set them
            auto clipPath = tvg::Shape::gen();
            clipPath->appendCircle(200, 510, 50, 50);          //x, y, w, h, rx, ry
            clipPath->appendCircle(200, 650, 50, 50);          //x, y, w, h, rx, ry
            clipPath->translate(20, 20);

            //Clipping picture to path
            picture->clip(clipPath);

            canvas->push(picture);
        }

        {
            auto shape1 = tvg::Shape::gen();
            shape1->appendRect(500, 420, 250, 250, 20, 20);
            shape1->fill(255, 0, 255, 160);

            // color/alpha/opacity are ignored for a clip object - no need to set them
            auto clipShape = tvg::Shape::gen();
            clipShape->appendCircle(600, 550, 150, 150);
            clipShape->strokeWidth(20);

            //Clipping shape1 to clipShape
            shape1->clip(clipShape);

            canvas->push(shape1);
        }

        return true;
    }
};


/************************************************************************/
/* Entry Point                                                          */
/************************************************************************/

int main(int argc, char **argv)
{
    return tvgexam::main(new UserExample, argc, argv);
}