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example.cc
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example.cc
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#include <cmath>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <skity/skity.hpp>
#include <string>
// same as https://fiddle.skia.org/c/@shapes
static void draw_basic_example(skity::Canvas* canvas) {
skity::Paint paint;
paint.setStyle(skity::Paint::kFill_Style);
paint.setAntiAlias(true);
paint.setStrokeWidth(4.f);
paint.setFillColor(0x42 / 255.f, 0x85 / 255.f, 0xF4 / 255.f, 1.f);
skity::Rect rect = skity::Rect::MakeXYWH(10, 10, 100, 160);
canvas->drawRect(rect, paint);
skity::RRect oval;
oval.setOval(rect);
oval.offset(40, 80);
paint.setFillColor(0xDB / 255.f, 0x44 / 255.f, 0x37 / 255.f, 1.f);
canvas->drawRRect(oval, paint);
paint.setFillColor(0x0F / 255.f, 0x9D / 255.f, 0x58 / 255.f, 1.f);
canvas->drawCircle(180, 50, 25, paint);
rect.offset(80, 50);
paint.setStrokeColor(0xF4 / 255.f, 0xB4 / 255.f, 0x0, 1.f);
paint.setStyle(skity::Paint::kStroke_Style);
canvas->drawRoundRect(rect, 10, 10, paint);
}
// same as https://fiddle.skia.org/c/@discrete_path
static void draw_path_effect_example(skity::Canvas* canvas) {
const float R = 115.2f, C = 128.f;
skity::Path path;
path.moveTo(C + R, C);
for (int32_t i = 1; i < 8; i++) {
float a = 2.6927937f * i;
path.lineTo(C + R * std::cos(a), C + R * std::sin(a));
}
skity::Paint paint;
paint.setPathEffect(skity::PathEffect::MakeDiscretePathEffect(10.f, 4.f));
paint.setStyle(skity::Paint::kStroke_Style);
paint.setStrokeWidth(2.f);
paint.setAntiAlias(true);
paint.setStrokeColor(0x42 / 255.f, 0x85 / 255.f, 0xF4 / 255.f, 1.f);
canvas->drawPath(path, paint);
}
static void draw_dash_start_example(skity::Canvas* canvas) {
skity::Path path;
path.moveTo(199, 34);
path.lineTo(253, 143);
path.lineTo(374, 160);
path.lineTo(287, 244);
path.lineTo(307, 365);
path.lineTo(199, 309);
path.lineTo(97, 365);
path.lineTo(112, 245);
path.lineTo(26, 161);
path.lineTo(146, 143);
path.close();
skity::Paint paint;
paint.setStrokeWidth(3.f);
paint.setStrokeJoin(skity::Paint::kRound_Join);
paint.setStrokeCap(skity::Paint::kRound_Cap);
paint.setStrokeColor(0, 0, 1, 1);
paint.setFillColor(150.f / 255.f, 150.f / 255.f, 1.f, 1.f);
paint.setAntiAlias(true);
paint.setStyle(skity::Paint::kStrokeAndFill_Style);
float pattern[2] = {10.f, 10.f};
paint.setPathEffect(skity::PathEffect::MakeDashPathEffect(pattern, 2, 0));
canvas->drawPath(path, paint);
}
// same as https://fiddle.skia.org/c/844ab7d5e63876f6c889b33662ece8d5
void draw_linear_gradient_example(skity::Canvas* canvas) {
skity::Paint p;
p.setStyle(skity::Paint::kFill_Style);
skity::Vec4 colors[] = {
skity::Vec4{0.f, 1.f, 1.f, 0.f},
skity::Vec4{0.f, 0.f, 1.f, 1.f},
skity::Vec4{1.f, 0.f, 0.f, 1.f},
};
float positions[] = {0.f, 0.65f, 1.f};
for (int i = 0; i < 4; i++) {
float blockX = (i % 2) * 100.f;
float blockY = (i / 2) * 100.f;
std::vector<skity::Point> pts = {
skity::Point{blockX, blockY, 0.f, 1.f},
skity::Point{blockX + 50, blockY + 100, 0.f, 1.f},
};
skity::Matrix matrix = glm::identity<skity::Matrix>();
int flag = 0;
if (i % 2 == 1) {
flag = 1;
}
if (i / 2 == 1) {
matrix *= glm::translate(glm::identity<glm::mat4>(),
glm::vec3(blockX, blockY, 0));
matrix *= glm::rotate(glm::identity<glm::mat4>(), glm::radians(45.f),
glm::vec3(0, 0, 1));
matrix *= glm::translate(glm::identity<glm::mat4>(),
glm::vec3(-blockX, -blockY, 0));
}
auto lgs =
skity::Shader::MakeLinear(pts.data(), colors, positions, 3, flag);
lgs->SetLocalMatrix(matrix);
p.setShader(lgs);
auto r = skity::Rect::MakeLTRB(blockX, blockY, blockX + 100, blockY + 100);
canvas->drawRect(r, p);
}
skity::Path circle;
circle.addCircle(220, 350, 100);
skity::Paint paint;
paint.setStyle(skity::Paint::kFill_Style);
paint.setAntiAlias(true);
skity::Point center{220, 350, 0, 1};
skity::Vec4 radialColors[] = {skity::Vec4{1.f, 1.f, 1.f, 1.f},
skity::Vec4{0.f, 0.f, 0.f, 1.f}};
float pts[] = {0.f, 1.f};
auto rgs = skity::Shader::MakeRadial(center, 150.f, radialColors, nullptr, 2);
paint.setShader(rgs);
canvas->drawPath(circle, paint);
}
// same as https://fiddle.skia.org/c/@text_rendering
void draw_simple_text(skity::Canvas* canvas) {
skity::Paint paint;
paint.setTextSize(64.f);
paint.setAntiAlias(true);
paint.setFillColor(0x42 / 255.f, 0x85 / 255.f, 0xF4 / 255.f, 1.f);
paint.setStyle(skity::Paint::kFill_Style);
skity::TextBlobBuilder builder;
paint.setTypeface(canvas->getDefaultTypeface());
auto blob = builder.buildTextBlob("Skity", paint);
canvas->drawTextBlob(blob.get(), 20.f, 64.f, paint);
paint.setStyle(skity::Paint::kStroke_Style);
paint.setStrokeColor(0xDB / 255.f, 0x44 / 255.f, 0x37 / 255.f, 1.f);
paint.setStrokeWidth(2.f);
canvas->drawTextBlob(blob.get(), 20.f, 144.f, paint);
paint.setFillColor(0x0F / 255.f, 0x9D / 255.f, 0x58 / 255.f, 1.f);
paint.setStyle(skity::Paint::kFill_Style);
canvas->save();
skity::Vec4 colors[] = {
skity::Vec4{0.f, 1.f, 1.f, 1.f},
skity::Vec4{0.f, 0.f, 1.f, 1.f},
skity::Vec4{1.f, 0.f, 0.f, 1.f},
};
std::vector<skity::Point> pts = {
skity::Point{0.f, 0.f, 0.f, 1.f},
skity::Point{200.f, 0.f, 0.f, 1.f},
};
auto lgs = skity::Shader::MakeLinear(pts.data(), colors, nullptr, 3);
paint.setShader(lgs);
canvas->drawTextBlob(blob.get(), 20.f, 224.f, paint);
canvas->restore();
}
void draw_even_odd_fill(skity::Canvas* canvas) {
skity::Paint paint;
paint.setStyle(skity::Paint::kFill_Style);
paint.setColor(skity::ColorSetA(skity::Color_RED, 64));
skity::Path path;
path.moveTo(100, 10);
path.lineTo(40, 180);
path.lineTo(190, 60);
path.lineTo(10, 60);
path.lineTo(160, 180);
path.close();
canvas->drawPath(path, paint);
canvas->save();
canvas->translate(0, 200);
path.setFillType(skity::Path::PathFillType::kEvenOdd);
canvas->drawPath(path, paint);
canvas->restore();
}
void draw_canvas(skity::Canvas* canvas) {
draw_basic_example(canvas);
canvas->save();
canvas->translate(300, 0);
draw_path_effect_example(canvas);
canvas->restore();
canvas->save();
canvas->translate(0, 300);
draw_dash_start_example(canvas);
canvas->restore();
canvas->save();
canvas->translate(520, 0);
draw_simple_text(canvas);
canvas->restore();
canvas->save();
canvas->translate(400, 300);
draw_linear_gradient_example(canvas);
canvas->restore();
canvas->save();
canvas->translate(800, 0);
draw_even_odd_fill(canvas);
canvas->restore();
}