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Pong: a paddle steered by tilting

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The player's move goes from -1 to 1 instead of three steps, and two
rules make it from the device's tilt: where the paddle is asked to be
(it rolls to the low side, about 15 degrees for the whole height) and
how to get there without overshooting. Host-tested.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0162FokPdvY2KsS4NBfwyWPk
This commit is contained in:
twisla
2026-10-15 12:06:29 +02:00
co-authored by Claude Opus 5.5
parent af9077cb94
commit e1d1ec899e
3 changed files with 48 additions and 7 deletions
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test/test_games/test_games.cpp
+21
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@@ -121,6 +121,25 @@ void test_pong_the_device_can_be_beaten() {
TEST_ASSERT_TRUE(playerPoints > 0);
}
void test_pong_a_tilt_puts_the_paddle_where_it_points() {
TEST_ASSERT_FLOAT_WITHIN(0.01, Pong::kHeight / 2, tiltTarget(0.3f, 0.3f)); // held as at the start: the middle
TEST_ASSERT_TRUE(tiltTarget(0.2f, 0.3f) < Pong::kHeight / 2); // top lowered: up
TEST_ASSERT_TRUE(tiltTarget(0.4f, 0.3f) > Pong::kHeight / 2);
TEST_ASSERT_FLOAT_WITHIN(0.01, Pong::kPaddleH / 2, tiltTarget(-0.9f, 0.3f)); // and no further than the edge
TEST_ASSERT_FLOAT_WITHIN(0.01, Pong::kHeight - Pong::kPaddleH / 2, tiltTarget(0.9f, 0.3f));
TEST_ASSERT_EQUAL_FLOAT(1, moveToward(20, 80));
TEST_ASSERT_EQUAL_FLOAT(-1, moveToward(80, 20));
TEST_ASSERT_FLOAT_WITHIN(0.01, 0.5f, moveToward(60, 65));
TEST_ASSERT_EQUAL_FLOAT(0, moveToward(60, 60));
}
void test_pong_a_tilted_paddle_settles_on_its_target() {
Pong p(3);
float target = tiltTarget(0.4f, 0.3f);
for (int i = 0; i < 200; i++) p.step(0.01f, moveToward(p.playerY(), target));
TEST_ASSERT_FLOAT_WITHIN(0.5, target, p.playerY());
}
void test_pong_the_device_paddle_has_a_top_speed() {
Pong p(13);
float before = p.deviceY();
@@ -658,6 +677,8 @@ int main() {
RUN_TEST(test_pong_a_miss_is_a_point_for_the_other_side);
RUN_TEST(test_pong_ends_at_seven);
RUN_TEST(test_pong_the_device_can_be_beaten);
RUN_TEST(test_pong_a_tilt_puts_the_paddle_where_it_points);
RUN_TEST(test_pong_a_tilted_paddle_settles_on_its_target);
RUN_TEST(test_pong_the_device_paddle_has_a_top_speed);
RUN_TEST(test_snake_starts_in_the_middle_three_long);
RUN_TEST(test_snake_moves_at_its_pace);