http://jhlong12345.blog.163.com/blog/static/1230631292015544450189/#
結合上一篇，繼續
矩形大小的調整
還有小bug，思路有了，就行了，就不貼修改正常的代碼了，自己動動手，有思路基本都可以很快寫出來的
看完還寫不出來的建議另尋他法吧
不要想着複制粘貼就正常運作，也不一定能解決你的問題
思路：
畫一個矩形，然後在mousedown時，判斷滑鼠是否在區域内，如果在，就在四個角畫四個小正方形，然後在mousemove中判斷是否在四個方格中，如果在，就出現箭頭滑鼠，然後做個标記，表示開始調整尺寸
直接看代碼吧，有點複雜了
//是否開始畫了
bool bDrawStart = false;
//矩形的起始點
Point pointStart = Point.Empty;
//矩形的起始點的對角點，滑鼠移動點
Point pointContinue = Point.Empty;
//是否要修改矩形，以滑鼠點選點在矩形内部為準，修改時自動在4個端點建立4個小方框，不能建立其他的矩形
bool bChange = false;
//修改矩形時移動點的X、Y記錄，好根據它在dicPoints找到對應的矩形，或dicPointsChange找到對應小方框
Point pMove1 = Point.Empty;
Point pMove2 = Point.Empty;
//修改矩形時滑鼠點選進4個小方框内，确認要根據滑鼠移動修改
bool bChangeMove = false;
//目前全部建立的矩形的記錄
Dictionary<Point, Point> dicPoints = new Dictionary<Point, Point>();
//矩形要修改大小時4個端點建立4個小方框的記錄
Dictionary<Point, Point> dicPointsChange = new Dictionary<Point, Point>();
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
if (bDrawStart)
{
bDrawStart = false;
}
else
{
bDrawStart = true;
pointStart = e.Location;
}
if (bChange)
{
bDrawStart = false;
foreach (var item in dicPointsChange)
{
Point p1 = item.Key;
Point p2 = item.Value;
//如果在4個小框裡
if ((e.Location.X > p1.X && e.Location.X < p2.X && e.Location.Y > p1.Y && e.Location.Y < p2.Y) ||
(e.Location.X > p2.X && e.Location.X < p1.X && e.Location.Y > p2.Y && e.Location.Y < p1.Y) ||
(e.Location.X > p2.X && e.Location.X < p1.X && e.Location.Y > p1.Y && e.Location.Y < p2.Y) ||
(e.Location.X > p1.X && e.Location.X < p2.X && e.Location.Y > p2.Y && e.Location.Y < p1.Y))
{
bChangeMove = true;
//p1、p2為小方框的對角點，中心點為矩形的端點,首先擷取端點，
//然後根據pMove1，pMove2确定小方框在的端點是矩形的哪個端點
//最後确定起始點，起始點pointStart為移動點（滑鼠點選點、小方框在的端點）的對角點
//pointContinue為移動點（滑鼠點選點、小方框在的端點）
Point p = Point.Empty;
p.X = p1.X > p2.X ? p1.X - 5 : p1.X + 5;
p.Y = p1.Y > p2.Y ? p1.Y - 5 : p1.Y + 5;
if (p == pMove1)
{
pointStart = pMove2;
}
else
if (p == pMove2)
{
pointStart = pMove1;
}
else
if (p == new Point(pMove1.X, pMove2.Y))
{
pointStart = new Point(pMove2.X, pMove1.Y);
}
else
if (p == new Point(pMove2.X, pMove1.Y))
{
pointStart = new Point(pMove1.X, pMove2.Y);
}
break;
}
}
//如果沒點選4個小方框，則預設放棄修改
if (!bChangeMove)
{
bDrawStart = true;
dicPointsChange.Clear();
bChange = false;
}
}
else
{
foreach (var item in dicPoints)
{
Point p1 = item.Key;
Point p2 = item.Value;
if ((e.Location.X > p1.X && e.Location.X < p2.X && e.Location.Y > p1.Y && e.Location.Y < p2.Y) ||
(e.Location.X > p2.X && e.Location.X < p1.X && e.Location.Y > p2.Y && e.Location.Y < p1.Y) ||
(e.Location.X > p2.X && e.Location.X < p1.X && e.Location.Y > p1.Y && e.Location.Y < p2.Y) ||
(e.Location.X > p1.X && e.Location.X < p2.X && e.Location.Y > p2.Y && e.Location.Y < p1.Y))
{
bChange = true;
bDrawStart = false; //不能畫新矩形了
dicPointsChange.Clear();
pMove1 = p1;
pMove2 = p2;
//畫出點選矩形的4個端點的4個小方框，并記錄入dicPointsChange
Graphics g = pictureBox1.CreateGraphics();
System.Drawing.Pen pen = new System.Drawing.Pen(Color.Red);
g.DrawRectangle(pen, p1.X - 5, p1.Y - 5, 10, 10);
g.DrawRectangle(pen, p2.X - 5, p2.Y - 5, 10, 10);
g.DrawRectangle(pen, p1.X - 5, p2.Y - 5, 10, 10);
g.DrawRectangle(pen, p2.X - 5, p1.Y - 5, 10, 10);
pen.Dispose();
dicPointsChange.Add(new Point(p1.X - 5, p1.Y - 5), new Point(p1.X + 5, p1.Y + 5));
dicPointsChange.Add(new Point(p2.X - 5, p2.Y - 5), new Point(p2.X + 5, p2.Y + 5));
dicPointsChange.Add(new Point(p2.X - 5, p1.Y - 5), new Point(p2.X + 5, p1.Y + 5));
dicPointsChange.Add(new Point(p1.X - 5, p2.Y - 5), new Point(p1.X + 5, p2.Y + 5));
break;
}
}
}
}
private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
if (bDrawStart)
{
pointContinue = e.Location;
Refresh();
}
if (bChangeMove)
{
pointContinue = e.Location;
Point p = Point.Empty;
foreach (var item in dicPoints)
{
Point p1 = item.Key;
Point p2 = item.Value;
//找到dicPoints裡的原始記錄
if (p1 == pointStart || p2 == pointStart || new Point(p1.X, p2.Y) == pointStart || new Point(p2.X, p1.Y) == pointStart)
{
p = p1;
break;
}
}
if (p != Point.Empty)
{
//先删除dicPoints裡的原始記錄，再根據新點建立新的記錄
dicPoints.Remove(p);
dicPoints.Add(pointStart, pointContinue);
dicPointsChange.Clear();
Point p1 = pointStart;
Point p2 = pointContinue;
//移動過程即時建立4個小方框，看起來小方框和矩形一起變大變小的效果
dicPointsChange.Add(new Point(p1.X - 5, p1.Y - 5), new Point(p1.X + 5, p1.Y + 5));
dicPointsChange.Add(new Point(p2.X - 5, p2.Y - 5), new Point(p2.X + 5, p2.Y + 5));
dicPointsChange.Add(new Point(p2.X - 5, p1.Y - 5), new Point(p2.X + 5, p1.Y + 5));
dicPointsChange.Add(new Point(p1.X - 5, p2.Y - 5), new Point(p1.X + 5, p2.Y + 5));
Refresh();
}
}
}
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
if (bDrawStart)
{ //此時矩形畫完，記錄矩形兩個對角點，在Paint裡畫
dicPoints.Add(pointStart, pointContinue);
}
if (bChangeMove)
{
bChangeMove = false;
bChange = false;
}
bDrawStart = false;
}
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
System.Drawing.Pen pen = new System.Drawing.Pen(Color.LimeGreen);
pen.Width = 2;
if (bDrawStart)
{
//實時的畫矩形
Graphics g = e.Graphics;
g.DrawRectangle(pen, pointStart.X, pointStart.Y, pointContinue.X - pointStart.X, pointContinue.Y - pointStart.Y);
}
//實時的畫之前已經畫好的矩形
foreach (var item in dicPoints)
{
Point p1 = item.Key;
Point p2 = item.Value;
e.Graphics.DrawRectangle(pen, p1.X, p1.Y, p2.X - p1.X, p2.Y - p1.Y);
}
if (bChangeMove)
{
pen.Color = Color.Red;
foreach (var item in dicPointsChange)
{
Point p1 = item.Key;
Point p2 = item.Value;
e.Graphics.DrawRectangle(pen, p1.X, p1.Y, p2.X - p1.X, p2.Y - p1.Y);
}
}
pen.Dispose();
} ![Unity遊戲開發背景知識[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)