protected override void OnDraw(Canvas canvas)
{
// Background Bitmap to Cover all Area
canvas.DrawBitmap(mBitmap, null, mMeasuredRect, null);
// Just draw the points only if it has already been initiated
if (points[3] != null)
{
int left, top, right, bottom;
left = points[0].X;
top = points[0].Y;
right = points[0].X;
bottom = points[0].Y;
// Sets the circles' locations
for (int i = 1; i < points.Length; i++)
{
left = left > points[i].X ? points[i].X : left;
top = top > points[i].Y ? points[i].Y : top;
right = right < points[i].X ? points[i].X : right;
bottom = bottom < points[i].Y ? points[i].Y : bottom;
}
mRectPaint.AntiAlias = true;
mRectPaint.Dither = true;
mRectPaint.StrokeJoin = Paint.Join.Round;
mRectPaint.StrokeWidth = 5;
mRectPaint.SetStyle(Paint.Style.Stroke);
mRectPaint.Color = Color.ParseColor("#0079A3");
canvas.DrawRect(
left + circles[0].GetCircleWidth() / 2,
top + circles[0].GetCircleWidth() / 2,
right + circles[2].GetCircleWidth() / 2,
bottom + circles[2].GetCircleWidth() / 2, mRectPaint);
// Fill The Rectangle
mRectPaint.SetStyle(Paint.Style.Fill);
mRectPaint.Color = Color.ParseColor("#B2D6E3");
mRectPaint.Alpha = 75;
mRectPaint.StrokeWidth = 0;
canvas.DrawRect(
left + circles[0].GetCircleWidth() / 2,
top + circles[0].GetCircleWidth() / 2,
right + circles[2].GetCircleWidth() / 2,
bottom + circles[2].GetCircleWidth() / 2, mRectPaint);
// DEBUG
mRectPaint.Color = Color.Red;
mRectPaint.TextSize = 18;
mRectPaint.StrokeWidth = 0;
// Draw every circle on the right position
for (int i = 0; i < circles.Count(); i++)
{
ResizeCircle circle = circles[i];
float x = circle.GetX();
float y = circle.GetY();
canvas.DrawBitmap(circle.GetBitmap(), x, y,
mRectPaint);
// DEBUG
// canvas.DrawText ("" + (i + 1), circle.GetX (), circle.GetY (), mRectPaint);
}
}
}
private int getTouchedCircle(int xTouch, int yTouch)
{
int groupId = -1;
for (int i = 0; i < circles.Count; i++)
{
ResizeCircle circle = circles[i];
// Check if the touch was inside the bounds of the circle
int centerX = circle.GetX() + circle.GetCircleWidth();
int centerY = circle.GetY() + circle.GetCircleHeight();
// Calculate the radius from the touch to the center of the circle
double radCircle = Math.Sqrt((double)(((centerX - xTouch) * (centerX - xTouch)) + (centerY - yTouch)
* (centerY - yTouch)));
// If the touch was on one of the circles
if (radCircle < circle.GetCircleWidth())
{
circleId = circle.GetID();
if (circleId == 1 || circleId == 3)
{
groupId = 2;
break;
}
else
{
groupId = 1;
break;
}
}
else
{
// User didn't touch any of the circles nor the inside area
groupId = -1;
}
}
// If the touch wasn't on one of the circles, check if it was inside the rectangle
if (groupId == -1)
{
List <int> xCoords = new List <int>();
List <int> yCoords = new List <int>();
// Gather Coordinates from all circles
foreach (ResizeCircle circle in circles)
{
xCoords.Add(circle.GetX());
yCoords.Add(circle.GetY());
}
// Store the max and min coordinates
int minX = xCoords.Min();
int maxX = xCoords.Max();
int minY = yCoords.Min();
int maxY = yCoords.Max();
// Check if user has touched inside the rectangle
if ((xTouch > minX && xTouch < maxX) && (yTouch > minY && yTouch < maxY))
{
// User has touched inside the Rectangle
groupId = 0;
}
}
return(groupId);
}
