diff --git a/shaders/fill_angle.f.glsl b/shaders/fill_angle.f.glsl
new file mode 100644
index 0000000..e76e8b2
--- /dev/null
+++ b/shaders/fill_angle.f.glsl
@@ -0,0 +1,34 @@
+/* Copyright (C) 2022 kichikuou <KichikuouChrome@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://gnu.org/licenses/>.
+ */
+
+uniform vec2 center;
+uniform float start_angle;
+uniform float angle;
+uniform vec4 color;
+
+const float PI = 3.14159265358979323846;
+
+in vec2 tex_coord;
+out vec4 frag_color;
+
+void main() {
+	vec2 p = tex_coord - center;
+	float a = atan(p.y, p.x);
+	a = mod(a - start_angle, 2 * PI);
+	if (a > angle)
+		discard;
+	frag_color = color;
+}
diff --git a/src/ffi.c b/src/ffi.c
index 925a286..fadb6fd 100644
--- a/src/ffi.c
+++ b/src/ffi.c
@@ -316,6 +316,7 @@ extern struct static_library lib_DrawSimpleText;
 extern struct static_library lib_File;
 extern struct static_library lib_File2;
 extern struct static_library lib_FileOperation;
+extern struct static_library lib_FillAngle;
 extern struct static_library lib_GoatGUIEngine;
 extern struct static_library lib_Gpx2Plus;
 extern struct static_library lib_GUIEngine;
@@ -380,6 +381,7 @@ static struct static_library *static_libraries[] = {
 	&lib_File,
 	&lib_File2,
 	&lib_FileOperation,
+	&lib_FillAngle,
 	&lib_GoatGUIEngine,
 	&lib_Gpx2Plus,
 	&lib_GUIEngine,
diff --git a/src/hll/FillAngle.c b/src/hll/FillAngle.c
new file mode 100644
index 0000000..a58d9ef
--- /dev/null
+++ b/src/hll/FillAngle.c
@@ -0,0 +1,84 @@
+/* Copyright (C) 2022 kichikuou <KichikuouChrome@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://gnu.org/licenses/>.
+ */
+
+#include <cglm/cglm.h>
+
+#include "gfx/gfx.h"
+#include "hll.h"
+#include "sact.h"
+
+struct fill_angele_shader {
+	struct shader s;
+	GLint center;
+	GLint start_angle;
+	GLint angle;
+	GLint color;
+};
+static struct fill_angele_shader shader;
+
+static void load_shader(void)
+{
+	gfx_load_shader(&shader.s, "shaders/render.v.glsl", "shaders/fill_angle.f.glsl");
+	shader.center = glGetUniformLocation(shader.s.program, "center");
+	shader.start_angle = glGetUniformLocation(shader.s.program, "start_angle");
+	shader.angle = glGetUniformLocation(shader.s.program, "angle");
+	shader.color = glGetUniformLocation(shader.s.program, "color");
+}
+
+static bool FillAngle_FillAngleAMAP(int sprite, int center_x, int center_y, int start_angle, int angle, int alpha)
+{
+	struct sact_sprite *sp = sact_try_get_sprite(sprite);
+	if (!sp)
+		return false;
+	struct texture *dst = sprite_get_texture(sp);
+	float w = dst->w;
+	float h = dst->h;
+
+	if (!shader.s.program)
+		load_shader();
+	glUseProgram(shader.s.program);
+	glUniform2f(shader.center, center_x / w, center_y / h);
+	glUniform1f(shader.start_angle, glm_rad(start_angle));
+	glUniform1f(shader.angle, glm_rad(angle));
+	glUniform4f(shader.color, 0, 0, 0, alpha / 255.0);
+	glUseProgram(0);
+
+	mat4 mw_transform = MAT4(
+	     w, 0, 0, 0,
+	     0, h, 0, 0,
+	     0, 0, 1, 0,
+	     0, 0, 0, 1);
+	mat4 wv_transform = WV_TRANSFORM(dst->w, dst->h);
+	GLuint fbo = gfx_set_framebuffer(GL_DRAW_FRAMEBUFFER, dst, 0, 0, dst->w, dst->h);
+
+	struct gfx_render_job job = {
+		.shader = &shader.s,
+		.texture = 0,
+		.world_transform = mw_transform[0],
+		.view_transform = wv_transform[0],
+		.data = NULL
+	};
+	glBlendFuncSeparate(GL_ZERO, GL_ONE, GL_ONE, GL_ZERO);
+	gfx_render(&job);
+	glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ZERO);
+
+	gfx_reset_framebuffer(GL_DRAW_FRAMEBUFFER, fbo);
+	return true;
+}
+
+HLL_LIBRARY(FillAngle,
+	    HLL_EXPORT(FillAngleAMAP, FillAngle_FillAngleAMAP)
+	    );
diff --git a/src/meson.build b/src/meson.build
index 798fd01..c5c6ec1 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -80,6 +80,7 @@ xsystem4 = [version_h,
             'hll/File.c',
             'hll/File2.c',
             'hll/FileOperation.c',
+            'hll/FillAngle.c',
             'hll/GoatGUIEngine.c',
             'hll/Gpx2Plus.c',
             'hll/GUIEngine.c',