characterCell closestCharacter()
{
//smallest distance and closest character
float smallestDistance = Mathf.Infinity;
characterCell closestCharacter = null;
//for all characters in the grid
for (int i = 0; i < wordSearch.characters.Count; i++)
{
if (Vector3.Distance(Input.GetTouch(0).position, wordSearch.characters[i].label.transform.position) < smallestDistance)
{
//if this character is closer than all previous characters, this is the closest character
smallestDistance = Vector3.Distance(Input.GetTouch(0).position, wordSearch.characters[i].label.transform.position);
closestCharacter = wordSearch.characters[i];
}
}
//make sure the mouse actually hits the closest character
if (smallestDistance > wordSearch.width / 1.2f)
{
return(null);
}
//return the closest character
return(closestCharacter);
}
void Update()
{
//return if we're not touching the screen
if (Input.touchCount == 0)
{
return;
}
if (Input.GetTouch(0).phase == TouchPhase.Began)
{
//get the closest character (closest to the touch position)
startCharacterCell = closestCharacter();
//if there is a character cell
if (startCharacterCell != null)
{
//create a new line and parent it to this object
currentLine = Instantiate(line).GetComponent <RectTransform>();
currentLine.gameObject.transform.SetParent(transform, false);
//if we're using random colors, apply a nice random color
if (randomColors)
{
Color color = new Color(Random.Range(0f, 1f), Random.Range(0f, 1f), Random.Range(0f, 1f), lineTransparency);
currentLine.gameObject.GetComponent <Image>().color = color;
//keep the last color (for the effect when the player finds a new word)
wordSearch.lastColor = color;
}
//start drawing the line
drawing = true;
}
}
//if we're swiping and we're drawing a line
else if (Input.GetTouch(0).phase == TouchPhase.Moved && drawing)
{
//get the character cell closest to the current drag position
endCharacterCell = closestCharacter();
//if there is a character cell
if (endCharacterCell != null)
{
//get the start and the current line position
Vector2 start = startCharacterCell.label.transform.parent.GetComponent <RectTransform>().anchoredPosition;
Vector2 current = endCharacterCell.label.transform.parent.GetComponent <RectTransform>().anchoredPosition;
//find the distance between the start and the current character cell
float distance = Vector2.Distance(start, current);
if (!lineWithCellWidth)
{
currentLine.sizeDelta = new Vector2(distance + (wordSearch.width * lineEndLength), lineWidth);
}
else
{
currentLine.sizeDelta = new Vector2(distance + (wordSearch.width * lineEndLength), wordSearch.width);
}
//set the line position(middle of the line) to the point in between the start and current position
currentLine.anchoredPosition = new Vector2((start.x + current.x) / 2f, (start.y + current.y) / 2f);
//change the rotation of the line
Vector2 v2 = current - start;
currentLine.localEulerAngles = new Vector3(currentLine.localEulerAngles.x, currentLine.localEulerAngles.y, Mathf.Atan2(v2.y, v2.x) * Mathf.Rad2Deg);
}
}
else if (Input.GetTouch(0).phase == TouchPhase.Ended)
{
//stop drawing if we release the screen
drawing = false;
//if there are both a start character cell and an end character cell and they're not the same object
if (startCharacterCell != null && endCharacterCell != null && startCharacterCell != endCharacterCell)
{
//tell the word search script we drew a new line
int startPosition = int.Parse(startCharacterCell.label.gameObject.transform.parent.name);
int endPosition = int.Parse(endCharacterCell.label.gameObject.transform.parent.name);
wordSearch.drewNewLine(startPosition, endPosition, false, endCharacterCell.label.transform.parent.GetComponent <RectTransform>().anchoredPosition);
//set the name of this line to the start and end position in case we need it later
currentLine.gameObject.name = startPosition + "-" + endPosition;
//add the line to the list of lines
lines.Add(currentLine.gameObject);
}
else if (currentLine != null)
{
//remove the line
Destroy(currentLine.gameObject);
}
//reset the current line
currentLine = null;
}
}
