example StrokeGradient

Example showing a gradient usage for a stroke.

src/examples/StrokeGradient.cpp

@@ -0,0 +1,209 @@
+#include "Common.h"
+
+/************************************************************************/
+/* Drawing Commands                                                     */
+/************************************************************************/
+tvg::Shape* pShape = nullptr;
+
+void tvgDrawCmds(tvg::Canvas* canvas)
+{
+    if (!canvas) return;
+
+    tvg::Fill::ColorStop colorStops1[3];
+    colorStops1[0] = {0, 255, 0, 0, 150};
+    colorStops1[1] = {0.5, 0, 0, 255, 150};
+    colorStops1[2] = {1, 127, 0, 127, 150};
+
+    tvg::Fill::ColorStop colorStops2[2];
+    colorStops2[0] = {0.3, 255, 0, 0, 255};
+    colorStops2[1] = {1, 50, 0, 255, 155};
+
+    tvg::Fill::ColorStop colorStops3[2];
+    colorStops3[0] = {0, 0, 0, 255, 155};
+    colorStops3[1] = {1, 0, 255, 0, 155};
+
+    float dashPattern1[2] = {15, 15};
+
+    // linear gradient stroke + linear gradient fill
+    auto shape1 = tvg::Shape::gen();
+    shape1->moveTo(100, 50);
+    shape1->lineTo(150, 50);
+    shape1->lineTo(150, 100);
+    shape1->lineTo(250, 100);
+    shape1->lineTo(200, 150);
+    shape1->lineTo(150, 150);
+    shape1->lineTo(150, 200);
+    shape1->lineTo(100, 250);
+    shape1->lineTo(100, 150);
+    shape1->lineTo(50, 150);
+    shape1->lineTo(50, 100);
+    shape1->close();
+
+    shape1->stroke(0, 255, 0, 255);
+    shape1->stroke(20);
+    shape1->stroke(tvg::StrokeJoin::Miter);
+    shape1->stroke(tvg::StrokeCap::Butt);
+    auto fillStroke1 = tvg::LinearGradient::gen();
+    fillStroke1->linear(50, 50, 200, 200);
+    fillStroke1->colorStops(colorStops1, 3);
+    shape1->stroke(move(fillStroke1));
+
+    auto fill1 = tvg::LinearGradient::gen();
+    fill1->linear(50, 50, 200, 200);
+    fill1->colorStops(colorStops1, 3);
+    shape1->fill(move(fill1));
+
+    if (canvas->push(move(shape1)) != tvg::Result::Success) return;
+
+    // radial gradient stroke + duplicate 
+    auto shape2 = tvg::Shape::gen();
+    shape2->appendCircle(500, 125, 100, 60);
+
+    shape2->stroke(80);
+    auto fillStroke2 = tvg::RadialGradient::gen();
+    fillStroke2->radial(500, 125, 100);
+    fillStroke2->colorStops(colorStops2, 2);
+    shape2->stroke(move(fillStroke2));
+
+    auto shape3 = unique_ptr<tvg::Shape>(static_cast<tvg::Shape*>(shape2->duplicate()));
+    shape3->translate(50, 200);
+
+    auto fillStroke3 = tvg::LinearGradient::gen();
+    fillStroke3->linear(400, 60, 600, 180);
+    fillStroke3->colorStops(colorStops3, 2);
+    shape3->stroke(move(fillStroke3));
+
+    auto shape4 = unique_ptr<tvg::Shape>(static_cast<tvg::Shape*>(shape2->duplicate()));
+    shape4->translate(100, 400);
+
+    if (canvas->push(move(shape2)) != tvg::Result::Success) return;
+    if (canvas->push(move(shape3)) != tvg::Result::Success) return;
+    if (canvas->push(move(shape4)) != tvg::Result::Success) return;
+
+    // dashed gradient stroke
+    auto shape5 = tvg::Shape::gen();
+    shape5->appendRect(150, 450, 300, 300, 50, 80);
+
+    shape5->stroke(20);
+    shape5->stroke(dashPattern1, 2);
+    shape5->stroke(tvg::StrokeCap::Butt);
+    auto fillStroke5 = tvg::LinearGradient::gen();
+    fillStroke5->linear(150, 450, 450, 750);
+    fillStroke5->colorStops(colorStops3, 2);
+    shape5->stroke(move(fillStroke5));
+
+    auto fill5 = tvg::LinearGradient::gen();
+    fill5->linear(150, 450, 450, 750);
+    fill5->colorStops(colorStops3, 2);
+    shape5->fill(move(fill5));
+    pShape = shape5.get();
+
+    if (canvas->push(move(shape5)) != tvg::Result::Success) return;
+    pShape->scale(0.8);
+    if (canvas->update(pShape) != tvg::Result::Success) return;
+}
+
+
+/************************************************************************/
+/* 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::ARGB8888);
+
+    /* 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;
+}

src/examples/meson.build

@@ -25,6 +25,7 @@ source_file = [
     'Stacking.cpp',
     'Stress.cpp',
     'Stroke.cpp',
+    'StrokeGradient.cpp',
     'StrokeLine.cpp',
     'Svg2.cpp',
     'Svg.cpp',