Use inbuilt function instead of helper

editor/src/messages/tool/tool_messages/text_tool.rs

@@ -309,29 +309,6 @@ impl TextToolData {
 		font_cache: &FontCache,
 		responses: &mut VecDeque<Message>,
 	) -> TextToolFsmState {
-		fn is_point_in_triangle(p: DVec2, a: DVec2, b: DVec2, c: DVec2) -> bool {
-			let v0 = c - a;
-			let v1 = b - a;
-			let v2 = p - a;
-
-			let dot00 = v0.dot(v0);
-			let dot01 = v0.dot(v1);
-			let dot02 = v0.dot(v2);
-			let dot11 = v1.dot(v1);
-			let dot12 = v1.dot(v2);
-
-			let denom = dot00 * dot11 - dot01 * dot01;
-			if denom == 0.0 {
-				return false; // Degenerate triangle
-			}
-			let inv_denom = 1.0 / denom;
-
-			let u = (dot11 * dot02 - dot01 * dot12) * inv_denom;
-			let v = (dot00 * dot12 - dot01 * dot02) * inv_denom;
-
-			u >= 0.0 && v >= 0.0 && (u + v) <= 1.0
-		}
-
 		// Check if the user has selected an existing text layerQ
 		if let Some(clicked_text_layer_path) = document
 			.metadata()
@@ -345,9 +322,7 @@ impl TextToolData {
 				let transformed_quad = document.metadata().transform_to_viewport(layer) * quad;
 				let mouse = DVec2::new(input.mouse.position.x, input.mouse.position.y);
 
-				if is_point_in_triangle(mouse, transformed_quad.0[0], transformed_quad.0[1], transformed_quad.0[2])
-					|| is_point_in_triangle(mouse, transformed_quad.0[0], transformed_quad.0[2], transformed_quad.0[3])
-				{
+				if transformed_quad.contains(mouse) {
 					return true;
 				}
 				false