project for a (works on my devices) demo

sources/input/touch/touch_controller_L2.c

@@ -0,0 +1,81 @@
+#include "../../../headers/input/touch/touch_controller_L2.h"
+#include <stdlib.h>
+#include <math.h>
+
+/* ...but the compiler throws an error, so math.h does not really define it */
+/* aarch64-linux-gnu/include/math.h already defines it */
+#ifndef M_PI
+#define M_PI	3.14159265358979323846264338327950288
+#endif
+
+touch_coordinates* TC_L2_getAABB( touch_event **events, uint8_t count){
+	touch_coordinates* AABB = malloc( 2 * sizeof(touch_coordinates));
+	uint8_t minX = UINT8_MAX;
+	uint8_t maxX = 0;
+	uint8_t minY = UINT8_MAX;
+	uint8_t maxY = 0;
+
+	touch_event *current;
+	for( uint8_t i = 0; i < count; i++){
+		current = events[i];
+		if( minX > current->position.x)
+			minX = current->position.x;
+
+		if( maxX < current->position.x)
+			maxX = current->position.x;
+
+		if( minY > current->position.y)
+			minY = current->position.y;
+
+		if( maxY < current->position.y)
+			maxY = current->position.y;
+	}
+
+	AABB[0].x = minX;
+	AABB[0].y = minY;
+	AABB[1].x = maxX;
+	AABB[1].y = maxY;
+	return AABB;
+}
+
+float TC_L2_get_width( touch_event **events, uint8_t count){
+	touch_coordinates* AABB = TC_L2_getAABB( events, count);
+
+	uint16_t dx = AABB[0].x - AABB[1].x;
+	uint16_t dy = AABB[0].y - AABB[1].y;
+	float width = sqrtf( powf( dx, 2) +  powf( dy, 2));
+
+	free( AABB);
+	return width;
+}
+
+float TC_L2_get_angle( touch_event **events, uint8_t count){
+	touch_coordinates* AABB = TC_L2_getAABB( events, count);
+
+	uint16_t dx = AABB[0].x - AABB[1].x;
+	uint16_t dy = AABB[0].y - AABB[1].y;
+	
+	free( AABB);
+	return atan2f(dx, dy) * 180 / M_PI;
+
+}
+
+touch_coordinates* TC_L2_get_midpoint( touch_event **events, uint8_t count){
+	uint32_t sum_x;
+	uint32_t sum_y;
+
+	if( !count){
+		return NULL;
+	}
+
+	for( uint8_t i = 0; i < count; i++){
+		sum_x += events[i]->position.x;
+		sum_y += events[i]->position.y;
+	}
+
+	touch_coordinates *mid = malloc( sizeof( touch_coordinates));
+	mid->x = sum_x / count;
+	mid->y = sum_y / count;
+
+	return mid;
+}