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API, sw_engine: add stroke-miterlimit example.

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Martin Capitanio 2023-06-09 13:05:43 +02:00 • committed by Hermet Park
parent 44a750ee5d
commit a597d3bb49
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270
src/examples/StrokeMiterlimit.cpp Normal file
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/*
* Copyright (c) 2020 - 2023 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 <fstream>
#include "Common.h"
/************************************************************************/
/* Drawing Commands */
/************************************************************************/
void bgColor(tvg::Canvas* canvas)
{
//Background
auto bg = tvg::Shape::gen();
bg->appendRect(0, 0, WIDTH, HEIGHT, 0, 0); //x, y, w, h, rx, ry
bg->fill(200, 200, 255); //r, g, b
canvas->push(std::move(bg));
}
void goWild(tvg::Canvas* canvas)
{
float top = 100.0f;
float bot = 700.0f;
auto path = tvg::Shape::gen();
path->moveTo(300, top / 2);
path->lineTo(100, bot);
path->lineTo(350, 400);
path->lineTo(420, bot);
path->lineTo(430, top * 2);
path->lineTo(500, bot);
path->lineTo(460, top * 2);
path->lineTo(750, bot);
path->lineTo(460, top / 2);
path->close();
path->fill(150, 150, 255); // fill color
path->stroke(20); // stroke width
path->stroke(120, 120, 255); // stroke color
// path->stroke(tvg::StrokeJoin::Round);
// path->stroke(tvg::StrokeJoin::Bevel);
path->stroke(tvg::StrokeJoin::Miter);
path->strokeMiterlimit(10);
static float ml = path->strokeMiterlimit();
cout << "Set stroke miterlimit to " << ml << endl;
canvas->push(std::move(path)); // push the path into the canvas
}
void blueprint(tvg::Canvas* canvas)
{
// Load png file from path.
std::string path = EXAMPLE_DIR"/stroke-miterlimit.png";
std::unique_ptr<tvg::Picture> picture = tvg::Picture::gen();
if (picture->load(path) != tvg::Result::Success) {
cout << "Cannot load the picture: " << path << endl;
return;
}
picture->opacity(42);
picture->translate(24, 0);
if (canvas->push(std::move(picture)) != tvg::Result::Success) {
cout << "Cannot push image to canvas: " << path << endl;
}
}
void svg(tvg::Canvas* canvas)
{
//SVG stroke-miterlimit test.
std::string svg_text (R"SVG(
<svg viewBox="0 0 38 30">
<!-- Impact of the default miter limit -->
<path
stroke="black"
fill="none"
stroke-linejoin="miter"
id="p1"
d="M1,9 l7 ,-3 l7 ,3
m2,0 l3.5 ,-3 l3.5 ,3
m2,0 l2 ,-3 l2 ,3
m2,0 l0.75,-3 l0.75,3
m2,0 l0.5 ,-3 l0.5 ,3" />
<!-- Impact of the smallest miter limit (1) -->
<path
stroke="black"
fill="none"
stroke-linejoin="miter"
stroke-miterlimit="1"
id="p2"
d="M1,19 l7 ,-3 l7 ,3
m2, 0 l3.5 ,-3 l3.5 ,3
m2, 0 l2 ,-3 l2 ,3
m2, 0 l0.75,-3 l0.75,3
m2, 0 l0.5 ,-3 l0.5 ,3" />
<!-- Impact of a large miter limit (8) -->
<path
stroke="black"
fill="none"
stroke-linejoin="miter"
stroke-miterlimit="8"
id="p3"
d="M1,29 l7 ,-3 l7 ,3
m2, 0 l3.5 ,-3 l3.5 ,3
m2, 0 l2 ,-3 l2 ,3
m2, 0 l0.75,-3 l0.75,3
m2, 0 l0.5 ,-3 l0.5 ,3" />
<!-- the following pink lines highlight the position of the path for each stroke -->
<path
stroke="pink"
fill="none"
stroke-width="0.05"
d="M1, 9 l7,-3 l7,3 m2,0 l3.5,-3 l3.5,3 m2,0 l2,-3 l2,3 m2,0 l0.75,-3 l0.75,3 m2,0 l0.5,-3 l0.5,3
M1,19 l7,-3 l7,3 m2,0 l3.5,-3 l3.5,3 m2,0 l2,-3 l2,3 m2,0 l0.75,-3 l0.75,3 m2,0 l0.5,-3 l0.5,3
M1,29 l7,-3 l7,3 m2,0 l3.5,-3 l3.5,3 m2,0 l2,-3 l2,3 m2,0 l0.75,-3 l0.75,3 m2,0 l0.5,-3 l0.5,3" />
</svg>
)SVG");
std::size_t svg_text_size = svg_text.size();
std::unique_ptr<tvg::Picture> picture = tvg::Picture::gen();
if (picture->load(svg_text.data(), svg_text_size, "svg", true) != tvg::Result::Success) {
cout << "Couldn't load svg text data." << endl;
return;
}
picture->scale(20);
canvas->push(std::move(picture));
}
void tvgDrawCmds(tvg::Canvas* canvas)
{
if (canvas) {
bgColor(canvas);
goWild(canvas);
blueprint(canvas);
svg(canvas);
}
}
/************************************************************************/
/* Sw Engine Test Code */
/************************************************************************/
static unique_ptr<tvg::SwCanvas> swCanvas;
void tvgSwTest(uint32_t* buffer)
{
//Create a Canvas
swCanvas = tvg::SwCanvas::gen();
swCanvas->target(buffer, WIDTH, WIDTH, HEIGHT, tvg::SwCanvas::ARGB8888S);
/* Push the shape into the Canvas drawing list
When this shape is into the canvas list, the shape could update & prepare
internal data asynchronously for coming rendering.
Canvas keeps this shape node unless user call canvas->clear() */
tvgDrawCmds(swCanvas.get());
}
void drawSwView(void* data, Eo* obj)
{
if (swCanvas->draw() == tvg::Result::Success) {
swCanvas->sync();
}
}
/************************************************************************/
/* GL Engine Test Code */
/************************************************************************/
static unique_ptr<tvg::GlCanvas> glCanvas;
void initGLview(Evas_Object *obj)
{
static constexpr auto BPP = 4;
//Create a Canvas
glCanvas = tvg::GlCanvas::gen();
glCanvas->target(nullptr, WIDTH * BPP, WIDTH, HEIGHT);
/* Push the shape into the Canvas drawing list
When this shape is into the canvas list, the shape could update & prepare
internal data asynchronously for coming rendering.
Canvas keeps this shape node unless user call canvas->clear() */
tvgDrawCmds(glCanvas.get());
}
void drawGLview(Evas_Object *obj)
{
auto gl = elm_glview_gl_api_get(obj);
gl->glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
gl->glClear(GL_COLOR_BUFFER_BIT);
if (glCanvas->draw() == tvg::Result::Success) {
glCanvas->sync();
}
}
/************************************************************************/
/* Main Code */
/************************************************************************/
int main(int argc, char **argv)
{
tvg::CanvasEngine tvgEngine = tvg::CanvasEngine::Sw;
if (argc > 1) {
if (!strcmp(argv[1], "gl")) tvgEngine = tvg::CanvasEngine::Gl;
}
//Initialize ThorVG Engine
if (tvgEngine == tvg::CanvasEngine::Sw) {
cout << "tvg engine: software" << endl;
} else {
cout << "tvg engine: opengl" << endl;
}
//Threads Count
auto threads = std::thread::hardware_concurrency();
//Initialize ThorVG Engine
if (tvg::Initializer::init(tvgEngine, threads) == tvg::Result::Success) {
elm_init(argc, argv);
if (tvgEngine == tvg::CanvasEngine::Sw) {
createSwView();
} else {
createGlView();
}
elm_run();
elm_shutdown();
//Terminate ThorVG Engine
tvg::Initializer::term(tvgEngine);
} else {
cout << "engine is not supported" << endl;
}
return 0;
}

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1
src/examples/meson.build
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@ -46,6 +46,7 @@ source_file = [
'Stress.cpp', 'Stress.cpp',
'Stroke.cpp', 'Stroke.cpp',
'StrokeLine.cpp', 'StrokeLine.cpp',
'StrokeMiterlimit.cpp',
'Svg.cpp', 'Svg.cpp',
'Svg2.cpp', 'Svg2.cpp',
'Texmap.cpp', 'Texmap.cpp',