填充两个矩形之间的空间

Question

当它们没有垂直对齐时，我如何填充两个矩形之间的空间。因此，如果一个矩形向上移动，它与下一个矩形之间的间隙（在一条链条中，它们都遵循相同的路径）看起来很平滑。

示例：

电流：

所需：

我当前的绘图代码：

public override void Draw(Graphics g)
{
    for (int i = 0; i < this._Children.Count; i++)
    {
        this._Children[i].Draw(g);

        if (i != 0 && i + 1 < this._Children.Count)
        {
            if (this._Children[i].Y != this._Children[i + 1].Y)
            {
                 //Draw circle in gap between?
            }
        }
    }

    base.Draw(g);
}

基础平局：

g.FillRectangle(this.Color, this.X, this.Y, this.Size.Width, this.Size.Height);
g.DrawRectangle(this.Outline, this.X, this.Y, this.Size.Width, this.Size.Height);

编辑：

在听完Jim和评论者的建议后，我想出了以下内容。数学似乎是错误的，但它并没有真正得到我想要的效果。

GraphicsPath path = new GraphicsPath();

for (int i = 0; i < this._Children.Count; i++)
{
    path.AddRectangle(this._Children[i].GetBoundingBox());

    if (i < this._Children.Count)
    {
        Block block = i == 0 ? (Block)this : this._Children[i - 1];

        float x = this._Children[i].X < block.X ? this._Children[i].X : block.X;
        float y = this._Children[i].Y > block.X ? this._Children[i].Y : block.Y;
        float width = System.Math.Abs(this._Children[i].X - block.X);
        float height = System.Math.Abs(this._Children[i].Y - block.Y);
        path.AddEllipse(x, y, width, height);
    }
}

g.FillPath(this._Children[0].Color, path);
g.DrawPath(this._Children[0].Outline, path);
base.Draw(g);

编辑2：跟随每个人的建议和编辑。吉姆现在的作品，但如果你向上移动并且你开始向右移动它只会吸引人。

现在有了TAW的建议，我得到了ArguementInvalid，我认为这是因为rGap矩形的高度是0。

我对TAW的实施：

for (int i = 0; i < this._Children.Count; i++)
{
    this._Children[i].Draw(g);

    if (i + 1 < this._Children.Count)
    {
        Block block = i == 0 ? (Block)this : this._Children[i + 1];

        Rectangle rec = this._Children[i].GetBoundingBox();
        Rectangle rec2 = block.GetBoundingBox();
        Rectangle rGap = new Rectangle(Math.Min(rec.X, rec2.X), Math.Min(rec.Y, rec2.Y), 2 * Math.Abs(rec.Left - rec2.Left), 2 * Math.Abs(rec2.Top - rec.Top));

        GraphicsPath gp = new GraphicsPath();
        gp.AddRectangle(rec);
        gp.AddRectangle(rec2);
        gp.AddArc(rGap, 0, 360);

        gp.FillMode = FillMode.Winding;
        g.DrawPath(this._Children[i].Outline, gp);
        g.FillPath(this._Children[i].Color, gp);
    }
}

base.Draw(g);

编辑3： 在研究了问题之后，我已经开发了自己的解决方案，这不是我想要的解决方案，但希望它能帮助别人。现在它只需要转换为圆角。

代码：

for (int i = 0; i < this._Children.Count; i++)
{
    this._Children[i].Draw(g);

    Block block = i - 1 < 0 ? (Block)this : this._Children[i - 1];

    Rectangle rec = this._Children[i].GetBoundingBox();
    Rectangle rec2 = block.GetBoundingBox();
    Direction dir = this._Children[i].GetDirection(true);
    Direction dir2 = block.GetDirection(true);

    int minX = Math.Min(rec.X, rec2.X);
    int minY = Math.Min(rec.Y, rec2.Y);
    int maxX = Math.Max(rec.X, rec2.X);
    int maxY = Math.Max(rec.Y, rec2.Y);
    int diffX = maxX - minX;
    int diffY = maxY - minY;
    int width = this._Children[i].Size.Width;
    int height = this._Children[i].Size.Height;
    Rectangle fillRec = default(Rectangle);

    if ((dir == Direction.Right && dir2 == Direction.Down) || (dir == Direction.Up && dir2 == Direction.Left))
    {
        fillRec = new Rectangle(minX + width, minY, diffX, diffY);
    }
    else if ((dir == Direction.Down && dir2 == Direction.Left) || (dir == Direction.Right && dir2 == Direction.Up))
    {
        fillRec = new Rectangle(minX + width, (maxY + height) - diffY, diffX, diffY);
    }
    else if ((dir == Direction.Up && dir2 == Direction.Right) || (dir == Direction.Left && dir2 == Direction.Down))
    {
        fillRec = new Rectangle(minX, minY, diffX, diffY);
    }
    else if ((dir == Direction.Left && dir2 == Direction.Up) || (dir == Direction.Down && dir2 == Direction.Right))
    {
        fillRec = new Rectangle(minX, (maxY + height) - diffY, diffX, diffY);
    }

    if (fillRec != default(Rectangle))
    {
        g.FillRectangle(this._Children[i].Color, fillRec);
        g.DrawRectangle(this._Children[i].Outline, fillRec);
    }
}
base.Draw(g);

制作：

Answer 1

除非空间是正方形，否则您无法在空间中绘制圆圈。但你可以绘制一个椭圆。

您需要做什么：

1. 确定相关矩形的范围。中心点是两个矩形相交的点（要填充的空白区域的右下角部分。左上角是左边矩形的X坐标和顶部矩形的Y坐标。宽度为{ {1}}，高度为2*(center.X - left)。
2. Fill an ellipse在那个矩形中。

注意，上述将具有绘制左上弯曲部分的效果。它不会完全填满下面的重叠矩形。

如果要删除线条，请在重叠空间中绘制一个没有边框的填充矩形（实际上，边框与填充颜色的颜色相同）。然后如上所述绘制填充的椭圆，再次没有边框。

要绘制椭圆的边框，请查看DrawArc。

Answer 2

这是一个为四个矩形绘制所有四个圆角的解决方案。

我创建了四个与各种间隙重叠的矩形，并添加它们和弧形以填充到GraphicsPath的间隙。

GraphicsPath GP = new GraphicsPath();

Rectangle fillGap(Rectangle R1, Rectangle R2, bool isTop, bool isLeft )
{ 
    int LeftMin    = Math.Min(R1.Left, R2.Left);
    int RightMax   = Math.Max(R1.Right, R2.Right);
    int TopMin     = Math.Min(R1.Top, R2.Top);
    int BotMax     = Math.Max(R1.Bottom, R2.Bottom);
    int RightGap   = 2 * Math.Abs(R1.Right - R2.Right);
    int LeftGap    = 2 * Math.Abs(R1.Left - R2.Left);
    int TopGap     = 2 * Math.Abs(R1.Top - R2.Top);
    int BotGap     = 2 * Math.Abs(R1.Bottom - R2.Bottom);

    Rectangle R = Rectangle.Empty; 
    if (isTop && isLeft) R = new Rectangle(LeftMin, TopMin, LeftGap, TopGap);
    if (isTop && !isLeft) 
        R = new Rectangle(RightMax - RightGap, TopMin, RightGap, TopGap);
    if (!isTop && !isLeft) 
        R = new Rectangle(RightMax - RightGap, BotMax  - BotGap , RightGap, BotGap );
    if (!isTop && isLeft) 
        R = new Rectangle(LeftMin, BotMax  - BotGap , LeftGap, BotGap );
     return R;
}

private void button1_Click(object sender, EventArgs e)
{
    Rectangle Rtop = new Rectangle(20, 10, 200, 40);
    Rectangle Rbottom = new Rectangle(20, 200, 200, 40);
    Rectangle Rleft = new Rectangle(10, 20, 40, 200);
    Rectangle Rright = new Rectangle(210, 20, 40, 200);

    GP = new GraphicsPath(); 
    GP.FillMode = FillMode.Winding;

    GP.AddRectangle(Rtop);
    GP.AddRectangle(Rleft);
    GP.AddRectangle(Rbottom);
    GP.AddRectangle(Rright);
    GP.AddArc(fillGap(Rtop, Rleft, true, true), 0, 360);
    GP.AddArc(fillGap(Rtop, Rright, true, false), 0, 360);
    GP.AddArc(fillGap(Rbottom, Rleft, false, true), 0, 360);
    GP.AddArc(fillGap(Rbottom, Rright, false, false), 0, 360);

    panel1.Invalidate();
}

private void panel1_Paint(object sender, PaintEventArgs e)
{
    using (Pen pen = new Pen(Color.Black, 1.5f))
    {
        e.Graphics.SmoothingMode = SmoothingMode.HighQuality;
        e.Graphics.DrawPath(pen, GP);
        if(checkBox1.Checked) e.Graphics.FillPath(Brushes.Red, GP);
    }
}

现在，代码假设您的间隙不比矩形宽。

轮廓笔不应小于1.5f或填充量会重叠太多。

平滑模式也应该是高质量的，所以没有像素丢失。

以下是它的外观：绘制＆amp;填充：