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test_pixel.dart
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import 'package:test/test.dart';
import 'test_tools.dart';
import 'pixel.dart';
void main() {
group("Pixel", () {
test("Can create a pixel.", () {
Pixel p = Pixel(0.1, 0.2, 0.3);
expect(p.r, equals(0.1));
expect(p.g, equals(0.2));
expect(p.b, equals(0.3));
});
test("Can create a zero pixel.", () {
Pixel p = Pixel.zero();
expect(p.r, equals(0.0));
expect(p.g, equals(0.0));
expect(p.b, equals(0.0));
});
test("Can add positive to a pixel.", () {
Pixel p = Pixel.zero();
p.add(0.1, 0.11, 0.111);
expect(p.r, equals(0.1));
expect(p.g, equals(0.11));
expect(p.b, equals(0.111));
});
test("Can add negative to a pixel.", () {
Pixel p = Pixel(0.1, 0.11, 0.111);
p.add(-0.1, -0.11, -0.111);
expect(p.r, equals(0.0));
expect(p.g, equals(0.0));
expect(p.b, equals(0.0));
});
test("Can call + on a pixel.", () {
Pixel p = Pixel(0.1, 0.1, 0.1);
Pixel q = Pixel(0.1, 0.2, 0.3);
Pixel r = p + q;
expect(true, isAcceptable(p.r, 0.2));
expect(true, isAcceptable(p.g, 0.3));
expect(true, isAcceptable(p.b, 0.4));
expect(true, isAcceptable(q.r, 0.1));
expect(true, isAcceptable(q.g, 0.2));
expect(true, isAcceptable(q.b, 0.3));
expect(true, isAcceptable(r.r, 0.2));
expect(true, isAcceptable(r.g, 0.3));
expect(true, isAcceptable(r.b, 0.4));
});
test("Can call whole number timesDouble on a pixel.", () {
Pixel p = Pixel(0.1, 0.1, 0.1);
Pixel q = p.timesDouble(2.0);
expect(true, isAcceptable(p.r, 0.2));
expect(true, isAcceptable(p.g, 0.2));
expect(true, isAcceptable(p.b, 0.2));
expect(true, isAcceptable(q.r, 0.2));
expect(true, isAcceptable(q.g, 0.2));
expect(true, isAcceptable(q.b, 0.2));
});
test("Can call fraction timesDouble on a pixel.", () {
Pixel p = Pixel(0.5, 0.5, 0.5);
Pixel q = p.timesDouble(0.5);
expect(true, isAcceptable(p.r, 0.25));
expect(true, isAcceptable(p.g, 0.25));
expect(true, isAcceptable(p.b, 0.25));
expect(true, isAcceptable(q.r, 0.25));
expect(true, isAcceptable(q.g, 0.25));
expect(true, isAcceptable(q.b, 0.25));
});
test("Can call positive combineWith on a pixel.", () {
Pixel p = Pixel(0.1, 0.1, 0.1);
Pixel q = Pixel(0.1, 0.2, 0.3);
Pixel r = p.combineWith(q);
expect(true, isAcceptable(p.r, 0.2));
expect(true, isAcceptable(p.g, 0.3));
expect(true, isAcceptable(p.b, 0.4));
expect(true, isAcceptable(q.r, 0.1));
expect(true, isAcceptable(q.g, 0.2));
expect(true, isAcceptable(q.b, 0.3));
expect(true, isAcceptable(r.r, 0.2));
expect(true, isAcceptable(r.g, 0.3));
expect(true, isAcceptable(r.b, 0.4));
});
test("Can call negative combineWith on a pixel.", () {
Pixel p = Pixel(0.5, 0.6, 0.7);
Pixel q = Pixel(-0.1, -0.2, -0.3);
Pixel r = p.combineWith(q);
expect(true, isAcceptable(p.r, 0.4));
expect(true, isAcceptable(p.g, 0.4));
expect(true, isAcceptable(p.b, 0.4));
expect(true, isAcceptable(q.r, -0.1));
expect(true, isAcceptable(q.g, -0.2));
expect(true, isAcceptable(q.b, -0.3));
expect(true, isAcceptable(r.r, 0.4));
expect(true, isAcceptable(r.g, 0.4));
expect(true, isAcceptable(r.b, 0.4));
});
test("Can call toPixelValue on a pixel.", () {
var t = Pixel.toPixelValue(0.5);
var u = Pixel.toPixelValue(1.0);
expect(t, equals(127));
expect(u, equals(255));
});
});
}