thorvg/examples/GradientMasking.cpp

/*
 * Copyright (c) 2020 - 2024 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
{
    bool content(tvg::Canvas* canvas, uint32_t w, uint32_t h) override
    {
        if (!canvas) return false;

        //Solid Rectangle
        auto shape = tvg::Shape::gen();
        shape->appendRect(0, 0, 400, 400);

        //Mask
        auto mask = tvg::Shape::gen();
        mask->appendCircle(200, 200, 125, 125);
        mask->fill(255, 0, 0);

        auto fill = tvg::LinearGradient::gen();
        fill->linear(0, 0, 400, 400);
        tvg::Fill::ColorStop colorStops[2];
        colorStops[0] = {0,0,0,0,255};
        colorStops[1] = {1,255,255,255,255};
        fill->colorStops(colorStops,2);
        shape->fill(std::move(fill));

        shape->composite(std::move(mask), tvg::CompositeMethod::AlphaMask);
        canvas->push(std::move(shape));

    //-------------------------------------------

        //Star
        auto shape1 = tvg::Shape::gen();
        shape1->moveTo(599, 34);
        shape1->lineTo(653, 143);
        shape1->lineTo(774, 160);
        shape1->lineTo(687, 244);
        shape1->lineTo(707, 365);
        shape1->lineTo(599, 309);
        shape1->lineTo(497, 365);
        shape1->lineTo(512, 245);
        shape1->lineTo(426, 161);
        shape1->lineTo(546, 143);
        shape1->close();

        //Mask
        auto mask1 = tvg::Shape::gen();
        mask1->appendCircle(600, 200, 125, 125);
        mask1->fill(255, 0, 0);

        auto fill1 = tvg::LinearGradient::gen();
        fill1->linear(400, 0, 800, 400);
        tvg::Fill::ColorStop colorStops1[2];
        colorStops1[0] = {0,0,0,0,255};
        colorStops1[1] = {1,1,255,255,255};
        fill1->colorStops(colorStops1,2);
        shape1->fill(std::move(fill1));

        shape1->composite(std::move(mask1), tvg::CompositeMethod::AlphaMask);
        canvas->push(std::move(shape1));

    //-------------------------------------------

        //Solid Rectangle
        auto shape2 = tvg::Shape::gen();
        shape2->appendRect(0, 400, 400, 400);

        //Mask
        auto mask2 = tvg::Shape::gen();
        mask2->appendCircle(200, 600, 125, 125);
        mask2->fill(255, 0, 0);

        auto fill2 = tvg::LinearGradient::gen();
        fill2->linear(0, 400, 400, 800);
        tvg::Fill::ColorStop colorStops2[2];
        colorStops2[0] = {0,0,0,0,255};
        colorStops2[1] = {1,255,255,255,255};
        fill2->colorStops(colorStops2,2);
        shape2->fill(std::move(fill2));

        shape2->composite(std::move(mask2), tvg::CompositeMethod::InvAlphaMask);
        canvas->push(std::move(shape2));

    //-------------------------------------------

        // Star
        auto shape3 = tvg::Shape::gen();
        shape3->moveTo(599, 434);
        shape3->lineTo(653, 543);
        shape3->lineTo(774, 560);
        shape3->lineTo(687, 644);
        shape3->lineTo(707, 765);
        shape3->lineTo(599, 709);
        shape3->lineTo(497, 765);
        shape3->lineTo(512, 645);
        shape3->lineTo(426, 561);
        shape3->lineTo(546, 543);
        shape3->close();

        //Mask
        auto mask3 = tvg::Shape::gen();
        mask3->appendCircle(600, 600, 125, 125);
        mask3->fill(255, 0, 0);

        auto fill3 = tvg::LinearGradient::gen();
        fill3->linear(400, 400, 800, 800);
        tvg::Fill::ColorStop colorStops3[2];
        colorStops3[0] = {0,0,0,0,255};
        colorStops3[1] = {1,1,255,255,255};
        fill3->colorStops(colorStops3,2);
        shape3->fill(std::move(fill3));

        shape3->composite(std::move(mask3), tvg::CompositeMethod::InvAlphaMask);
        canvas->push(std::move(shape3));

        return true;
    }
};


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

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