49 lines
1.1 KiB
Go
49 lines
1.1 KiB
Go
package geom
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// Rectangle represents a 2-dimensional surface with as boundaries Min (inclusive) and Max (exclusive).
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type Rectangle struct {
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Min, Max Point
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}
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// Rect is a shorthand function to create a rectangle.
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func Rect(x0, y0, x1, y1 int) Rectangle {
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if x0 > x1 {
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x0, x1 = x1, x0
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}
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if y0 > y1 {
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y0, y1 = y1, y0
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}
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return Rectangle{Point{x0, y0}, Point{x1, y1}}
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}
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// Add translates rectangle r by point p.
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func (r Rectangle) Add(p Point) Rectangle {
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return Rectangle{
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Point{r.Min.X + p.X, r.Min.Y + p.Y},
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Point{r.Max.X + p.X, r.Max.Y + p.Y},
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}
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}
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// Dx returns the width of r.
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func (r Rectangle) Dx() int {
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return r.Max.X - r.Min.X
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}
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// Dy returns the height of r.
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func (r Rectangle) Dy() int {
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return r.Max.Y - r.Min.Y
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}
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// Size returns the size of the rectangle.
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func (r Rectangle) Size() Point {
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return Point{r.Max.X - r.Min.X, r.Max.Y - r.Min.Y}
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}
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// Sub translates rectangle r in the opposite direction of point p.
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func (r Rectangle) Sub(p Point) Rectangle {
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return Rectangle{
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Point{r.Min.X - p.X, r.Min.Y - p.Y},
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Point{r.Max.X - p.X, r.Max.Y - p.Y},
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}
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}
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