问题
How do I check if a mouse clicked a rectangle?
Graphics gfx;
Rectangle hitbox;
hitbox = new hitbox(50,50,10,10);
//TIMER AT THE BOTTOM
gfx.Draw(System.Drawing.Pens.Black,hitbox);
回答1:
Just a sample quick and dirty, if your "gfx" is a "e.Graphics..." from a Form:
public partial class Form1 : Form
{
private readonly Rectangle hitbox = new Rectangle(50, 50, 10, 10);
private readonly Pen pen = new Pen(Brushes.Black);
public Form1()
{
InitializeComponent();
}
private void Form1_Paint(object sender, PaintEventArgs e)
{
e.Graphics.DrawRectangle(pen, hitbox);
}
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
if ((e.X > hitbox.X) && (e.X < hitbox.X + hitbox.Width) &&
(e.Y > hitbox.Y) && (e.Y < hitbox.Y + hitbox.Height))
{
Text = "HIT";
}
else
{
Text = "NO";
}
}
}
回答2:
Rectangle has several handy but often overlooked functions. In this case using the Rectangle.Contains(Point) function is the best solution:
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
if (hitbox.Contains(e.Location)) .. // clicked inside
}
To determine if you clicked on the outline you will want to decide on a width, since the user can't easily hit a single pixel.
For this you can use either GraphicsPath.IsOutlineVisible(Point)..
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
GraphicsPath gp = new GraphicsPath();
gp.AddRectanle(hitbox);
using (Pen pen = new Pen(Color.Black, 2f))
if (gp.IsOutlineVisible(e.location), pen) .. // clicked on outline
}
..or stick to rectangles..:
private void Form1_MouseDown(object sender, MouseEventArgs e)
{
Rectangle inner = hitbox;
Rectangle outer = hitbox;
inner.Inflate(-1, -1); // a two pixel
outer.Inflate(1, 1); // ..outline
if (outer.Contains(e.Location) && !innerContains(e.Location)) .. // clicked on outline
}
来源:https://stackoverflow.com/questions/38319092/i-made-a-rectangle-how-do-i-check-if-the-mouse-clicked-on-it