physics

Documentation

Index

• func HitTestCircle(x, y float64, circle geom.Circle) bool
• func HitTestEllipse(x, y float64, ellipse geom.Ellipse) bool
• func HitTestPolygon(x, y float64, vertices []geom.Point) (hit bool)
• func HitTestRect(x, y float64, rect geom.Rect) bool
• func ResolveCollidingCircles(a, b *geom.Circle) bool
• func ResolveCollidingEllipses(a, b *geom.Ellipse) bool
• func ResolveCollidingPolygons(a, b *geom.Polygon) bool
• func ResolveCollidingRects(a, b *geom.Rect) bool
• type AABB
  • func BoundsFromCenterSize(x, y, w, h float64) AABB
  • func (b AABB) Center() geom.Point
  • func (b AABB) GetX() float64
  • func (b AABB) GetY() float64
  • func (b AABB) Height() float64
  • func (b AABB) HitTest(x, y float64) bool
  • func (b AABB) HitTestXY(xy geom.XYGetter) bool
  • func (b AABB) Intersects(target AABB) bool
  • func (b AABB) Rect() *sdl.Rect
  • func (b AABB) Union(target AABB) AABB
  • func (b AABB) Width() float64
• type CircleCollider
  • func (cc *CircleCollider) Bounds() AABB
  • func (cc *CircleCollider) HitTest(x, y float64) bool
  • func (cc *CircleCollider) HitTestXY(xy geom.XYGetter) bool
  • func (cc *CircleCollider) Shape() geom.Shape
• type Collider
  • func NewCollider(shape geom.Shape) Collider
• type EllipseCollider
  • func (ec *EllipseCollider) Bounds() AABB
  • func (ec *EllipseCollider) HitTest(x, y float64) bool
  • func (ec *EllipseCollider) HitTestXY(xy geom.XYGetter) bool
  • func (ec *EllipseCollider) Shape() geom.Shape
• type HitTester
• type PolygonCollider
  • func (pc *PolygonCollider) Bounds() AABB
  • func (pc *PolygonCollider) HitTest(x, y float64) (hit bool)
  • func (pc *PolygonCollider) HitTestXY(xy geom.XYGetter) bool
  • func (pc *PolygonCollider) Polygon() geom.PolygonShape
  • func (pc *PolygonCollider) Shape() geom.Shape
• type RectCollider
  • func (rc *RectCollider) Bounds() AABB
  • func (rc *RectCollider) HitTest(x, y float64) bool
  • func (rc *RectCollider) HitTestXY(xy geom.XYGetter) bool
  • func (rc *RectCollider) Shape() geom.Shape

Functions

func HitTestCircle

func HitTestCircle(x, y float64, circle geom.Circle) bool

func HitTestEllipse

func HitTestEllipse(x, y float64, ellipse geom.Ellipse) bool

func HitTestPolygon

func HitTestPolygon(x, y float64, vertices []geom.Point) (hit bool)

// https://wrf.ecse.rpi.edu/Research/Short_Notes/pnpoly.html

func HitTestRect

func HitTestRect(x, y float64, rect geom.Rect) bool

func ResolveCollidingCircles

func ResolveCollidingCircles(a, b *geom.Circle) bool

func ResolveCollidingEllipses

func ResolveCollidingEllipses(a, b *geom.Ellipse) bool

func ResolveCollidingPolygons

func ResolveCollidingPolygons(a, b *geom.Polygon) bool

func ResolveCollidingRects

func ResolveCollidingRects(a, b *geom.Rect) bool

Types

type AABB

type AABB struct {
	TopLeft, BottomRight geom.Point
}

AABB is an axis-aligned bounding box with X and Y indicating its top left corner.

func BoundsFromCenterSize

func BoundsFromCenterSize(x, y, w, h float64) AABB

func (AABB) Center

func (b AABB) Center() geom.Point

func (AABB) GetX

func (b AABB) GetX() float64

func (AABB) GetY

func (b AABB) GetY() float64

func (AABB) Height

func (b AABB) Height() float64

func (AABB) HitTest

func (b AABB) HitTest(x, y float64) bool

HitTest returns true when the x and y values are within the AABB.

func (AABB) HitTestXY

func (b AABB) HitTestXY(xy geom.XYGetter) bool

HitTestXY returns true when the position of the XYGetter is inside AABB.

func (AABB) Intersects

func (b AABB) Intersects(target AABB) bool

func (AABB) Rect

func (b AABB) Rect() *sdl.Rect

func (AABB) Union

func (b AABB) Union(target AABB) AABB

func (AABB) Width

func (b AABB) Width() float64

type CircleCollider

type CircleCollider struct {
	// contains filtered or unexported fields
}

func (*CircleCollider) Bounds

func (cc *CircleCollider) Bounds() AABB

func (*CircleCollider) HitTest

func (cc *CircleCollider) HitTest(x, y float64) bool

HitTest returns true when position [x y] is inside the Circle. It calculates the squared distance between [x y] and the Circle's center X Y and compares this with the squared Radius.

func (*CircleCollider) HitTestXY

func (cc *CircleCollider) HitTestXY(xy geom.XYGetter) bool

HitTestXY forwards the hit-test call to the geom.Circle HitTest method and returns true when the point [x y] is inside the collider.

func (*CircleCollider) Shape

func (cc *CircleCollider) Shape() geom.Shape

type Collider

type Collider interface {
	HitTester
	Shape() geom.Shape
	Bounds() AABB
}

func NewCollider

func NewCollider(shape geom.Shape) Collider

type EllipseCollider

type EllipseCollider struct {
	// contains filtered or unexported fields
}

func (*EllipseCollider) Bounds

func (ec *EllipseCollider) Bounds() AABB

func (*EllipseCollider) HitTest

func (ec *EllipseCollider) HitTest(x, y float64) bool

HitTest returns true when position [x y] is inside the EllipseCollider's geom.Ellipse shape. https://math.stackexchange.com/questions/76457/check-if-a-point-is-within-an-ellipse

func (*EllipseCollider) HitTestXY

func (ec *EllipseCollider) HitTestXY(xy geom.XYGetter) bool

HitTestXY returns true when the position of the XYGetter is inside Ellipse.

func (*EllipseCollider) Shape

func (ec *EllipseCollider) Shape() geom.Shape

type HitTester

type HitTester interface {
	// HitTest returns true when the x and y values are within the HitTester.
	HitTest(x, y float64) bool
	HitTestXY(xy geom.XYGetter) bool
}

type PolygonCollider

type PolygonCollider struct {
	// contains filtered or unexported fields
}

func (*PolygonCollider) Bounds

func (pc *PolygonCollider) Bounds() AABB

func (*PolygonCollider) HitTest

func (pc *PolygonCollider) HitTest(x, y float64) (hit bool)

HitTest tests if the provided point [x y] is inside the PolygonCollider's geom.Polygon shape.

func (*PolygonCollider) HitTestXY

func (pc *PolygonCollider) HitTestXY(xy geom.XYGetter) bool

HitTestXY forwards the hit-test call to the geom.polygon HitTest method and returns true when the point [x y] is inside the collider.

func (*PolygonCollider) Polygon

func (pc *PolygonCollider) Polygon() geom.PolygonShape

func (*PolygonCollider) Shape

func (pc *PolygonCollider) Shape() geom.Shape

type RectCollider

type RectCollider struct {
	// contains filtered or unexported fields
}

func (*RectCollider) Bounds

func (rc *RectCollider) Bounds() AABB

func (*RectCollider) HitTest

func (rc *RectCollider) HitTest(x, y float64) bool

HitTest returns true when the x and y values are within the Rect.

func (*RectCollider) HitTestXY

func (rc *RectCollider) HitTestXY(xy geom.XYGetter) bool

HitTestXY forwards the hit-test call to the geom.Rect HitTest method and returns true when the point [x y] is inside the collider.

func (*RectCollider) Shape

func (rc *RectCollider) Shape() geom.Shape