/// <summary>
/// rectから0より小さい領域を切り取ったRectangleを返す．
/// </summary>
public static Rectangle EnsureNoNegative(Rectangle rect)
{
var size = new Size(
rect.Left < 0? rect.Width + rect.Left: rect.Width,
rect.Top < 0? rect.Height + rect.Top: rect.Height
);
return(new Rectangle(
PointUtil.EnsureNotNegative(rect.Location),
size
));
}
public void TestMiddlePoint()
{
Assert.AreEqual(
new Point(10, 10),
PointUtil.MiddlePoint(new Point(0, 0), new Point(20, 20))
);
Assert.AreEqual(
new Point(10, 10),
PointUtil.MiddlePoint(new Point(20, 20), new Point(0, 0))
);
Assert.AreEqual(
new Point(10, 10),
PointUtil.MiddlePoint(new Point(20, 0), new Point(0, 20))
);
Assert.AreEqual(
new Point(10, 10),
PointUtil.MiddlePoint(new Point(0, 20), new Point(20, 0))
);
}
public void TestScaleWithCircumscribeRect()
{
var pts = new Point[] {
new Point(10, 10),
new Point(20, 10),
new Point(20, 20),
new Point(10, 20),
};
PointUtil.ScaleWithCircumscribeRect(pts, new SizeF(0.5f, 2));
Assert.AreEqual(new Point(10, 10), pts[0]);
Assert.AreEqual(new Point(15, 10), pts[1]);
Assert.AreEqual(new Point(15, 30), pts[2]);
Assert.AreEqual(new Point(10, 30), pts[3]);
PointUtil.ScaleWithCircumscribeRect(pts, new SizeF(2, 0.5f));
Assert.AreEqual(new Point(10, 10), pts[0]);
Assert.AreEqual(new Point(20, 10), pts[1]);
Assert.AreEqual(new Point(20, 20), pts[2]);
Assert.AreEqual(new Point(10, 20), pts[3]);
}
/// <summary>
/// rectの中心点に対してptがどの方向にあるかを返す．
/// 答えは Left や Up や None のように重なりがない。
/// </summary>
public static Directions GetDirectionStraightlyFromCenter(Rectangle rect, Point pt)
{
return(PointUtil.GetDirectionStraightly(GetCenter(rect), pt));
}