From b374282e23a1811088aff88fe494f4293484b49e Mon Sep 17 00:00:00 2001
From: Neo Xu <neo.xu1990@gmail.com>
Date: Mon, 29 May 2023 23:36:33 +0800
Subject: [PATCH] test: add math test for cubic-bezier function

Signed-off-by: Neo Xu <neo.xu1990@gmail.com>
---
 tests/src/test_cases/test_math.c | 37 ++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
 create mode 100644 tests/src/test_cases/test_math.c

diff --git a/tests/src/test_cases/test_math.c b/tests/src/test_cases/test_math.c
new file mode 100644
index 000000000..f5f8af1ac
--- /dev/null
+++ b/tests/src/test_cases/test_math.c
@@ -0,0 +1,37 @@
+#if LV_BUILD_TEST
+#include "../lvgl.h"
+
+#include "unity/unity.h"
+
+void test_math_cubic_bezier_result_should_be_precise(void)
+{
+    int32_t x, x1, y1, x2, y2, y;
+    int i = 0;
+    while(i++ < 10000) {
+        x1 = lv_rand(0, 1024);
+        x2 = lv_rand(0, 1024);
+        y1 = lv_rand(0, 1024);
+        y2 = lv_rand(0, 1024);
+        float fx1 = x1 / 1024.f;
+        float fx2 = x2 / 1024.f;
+        float fy1 = y1 / 1024.f;
+        float fy2 = y2 / 1024.f;
+        float fx, fy;
+
+        int j = 0;
+        while(j++ < 100000) {
+            x = lv_rand(0, 1024);
+            y = lv_cubic_bezier(x, x1, y1, x2, y2);
+            fx = x / 1024.f;
+            fy = lv_cubic_bezier_f(fx, fx1, fy1, fx2, fy2);
+#if 1
+            if (LV_ABS(fy * 1024 - y) > 250) {
+                printf("x, x1, y1, x2, y2: %d,%d,%d,%d,%d\n", (int)x, (int)x1, (int)y1, (int)x2, (int)y2);
+            }
+#endif
+            TEST_ASSERT_LESS_OR_EQUAL(250, LV_ABS(fy * 1024 - y));
+        }
+    }
+}
+
+#endif