feat: implemented the basic collider system.

cmd/test/player.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	//"math/rand"
-	//"fmt"
+	"fmt"
 	"time"
 )
 
@@ -28,12 +28,24 @@ func NewPlayer() *Player {
 	ret.Visible = true
 	ret.Layer = PlayerL
 
+	ret.Collidable = true
+	ret.Resolvable = true
+
 	return ret
 }
 
 func (p *Player) Start(c *Context) {
 }
 
+func (p *Player) Draw(c *Context) []gg.EVertex {
+	return p.AnimatedSprite.Draw(c)
+	prect := &gg.DrawableRectangle{
+		Rectangle: p.Rectangle(),
+	}
+	prect.Color = gg.Rgba(1, 1, 1, 1)
+	return prect.Draw(c)
+}
+
 func (p *Player) Update(c *Context) {
 	if p.Spawned {
 		return
@@ -58,7 +70,7 @@ func (p *Player) Update(c *Context) {
 		case gg.KeyArrowRight:
 			cam.Position.X += p.MoveSpeed * dt
 		case gg.KeyW:
-			p.Position.Y += p.MoveSpeed * dt
+			p.Position.Y -= p.MoveSpeed * dt*10
 			walking = true
 			p.Animate(Walk)
 		case gg.KeyA:
@@ -140,5 +152,26 @@ func (p *Player) Update(c *Context) {
 			ec.Offset.Y * dt * p.ScaleSpeed * 40,
 		))
 	}}
+
+	p.Position.Y += 2
+}
+
+func (p *Player) Resolve(c *Context) {
+
+	col := c.Collisions[0]
+	fmt.Printf("frame[%d]: the col[0] len(%d): %T, %T\n", c.Frame(), len(c.Collisions), col.What, col.With)
+	switch col.Type{
+	case gg.PhysCollision :
+		LOOP:
+		for {
+			p.Position.Y -= 0.2
+			shit, collides := gg.Collide(p, col.With)
+			fmt.Println("shit:", shit)
+			fmt.Println("do:", collides)
+			if !collides {
+				break LOOP
+			}
+		}
+	}
 }
 

cmd/test/rect.go

@@ -17,6 +17,9 @@ func NewRect() *Rect {
 	}
 	ret.Layer = RectL
 	ret.Visible = true
+	ret.Collidable = true
+	ret.Width = 100
+	ret.Height = 200
 
 	return ret
 }

collider.go

@@ -12,14 +12,14 @@ package gg
 
 type CollisionType int
 const (
-	CollisionTypePhys CollisionType = iota
+	PhysCollision CollisionType = iota
-	CollisionTypeTrigger
+	TriggerCollision
 )
 
 // The structure contains collision information.
 type Collision struct {
 	Type CollisionType
-	What, With Objecter
+	What, With Collider
 	// Points of Self contained in 
 	Points Points
 	Crosses []LineCross
@@ -28,19 +28,21 @@ type Collision struct {
 
 // Implementing the interface lets the engine
 // to determine if the object collides with anything.
-// Mostly will use the Collide function with some
-// inner structure field as first argument.
-// The Collide method will be called on collisions.
 type Collider interface {
 	// Checks whether the object is collidable
+	CollisionType() CollisionType
 	IsCollidable() bool
 	Verticer
 	Edger
 	PointContainer
 }
 type Collidability struct {
+	Type CollisionType
 	Collidable bool
 }
+func (c Collidability) CollisionType() CollisionType {
+	return c.Type
+}
 func (c Collidability) IsCollidable() bool {
 	return c.Collidable
 }
@@ -75,6 +77,9 @@ func Collide(c1, c2 Collider) (Collision, bool) {
 	crosses, doCross := es1.LineCrossWith(es2)
 	pts := c2.ContainedPoints(vertices)
 	return Collision{
+		Type: c2.CollisionType(),
+		What: c1,
+		With: c2,
 		Points: pts,
 		Crosses: crosses,
 	}, len(pts) != 0 || doCross
@@ -83,9 +88,13 @@ func Collide(c1, c2 Collider) (Collision, bool) {
 func GetCollisions(c Collider, cs []Collider) []Collision {
 	ret := []Collision{}
 	for _, ic := range cs {
-		if !ic.IsCollidable() || ic == c {
+		if ic == c {
 			continue
 		}
+		col, has := Collide(c, ic)
+		if has {
+			ret = append(ret, col)
+		}
 	}
 	return ret
 }

engine.go

@@ -4,7 +4,7 @@ import (
 	"github.com/hajimehoshi/ebiten/v2"
 	"github.com/hajimehoshi/ebiten/v2/inpututil"
 	"vultras.su/core/gods/maps"
-	"fmt"
+	//"fmt"
 	"time"
 	"slices"
 	"sync"
@@ -164,7 +164,12 @@ func (e *Engine) Spawn(b Objecter) error {
 	obj.input = make(chan *Context)
 	go func() {
 		for c := range obj.input {
-			b.Update(c)
+			switch c.typ{
+			case updateContext :
+				b.Update(c)
+			case resolveContext :
+				b.Resolve(c)
+			}
 			e.wg.Done()
 		}
 	}()
@@ -300,7 +305,7 @@ func (e *engine) Update() error {
 	e.dt = time.Since(e.lastTime)
 
 	e.runes = ebiten.AppendInputChars(e.runes[:0])
-	fmt.Println("runes:", e.runes)
+	//fmt.Println("runes:", e.runes)
 	// Buffering the context for faster.
 	// Providing the events to the objects.
 	// Maybe should think of the better way,
@@ -325,16 +330,39 @@ func (e *engine) Update() error {
 }
 
 func (e *engine) Resolve() {
+	eng := (*Engine)(e)
+	type resHold struct{
+		Resolver Resolver
+		input chan *Context
+	}
 	colliders := []Collider{}
-	resolvers := []Resolver{}
+
+	resolvers := []resHold{}
 	for _, object := range e.Objects.store {
 		if object.IsCollidable() {
 			colliders = append(colliders, object)
 		}
 		if object.IsResolvable() {
-			resolvers = append(resolvers, object)
+			resolvers = append(resolvers, resHold{
+				object,
+				object.Input(),
+			})
 		}
 	}
+
+	for _, resolver := range resolvers {
+		cols := GetCollisions(resolver.Resolver, colliders)
+		if len(cols) > 0 {
+			c := &Context{
+				typ: resolveContext,
+				Collisions: cols,
+				Engine: eng,
+			}
+			e.wg.Add(1)
+			resolver.input <- c
+		}
+	}
+	e.wg.Wait()
 }
 
 var (

rect.go

@@ -17,12 +17,15 @@ type Rectangle struct {
 
 // Return points of vertices of the rectangle.
 func (r Rectangle) Vertices() Vertices {
-	m := r.Matrix()
+	t := r.Transform
+	wh := V(r.Width, r.Height)
+	t.Around = t.Around.Scale(wh)
+	m := t.Matrix()
 	p1 := V(0, 0).Apply(m)
-	p2 := V(1, 0).Apply(m)
+	p2 := V(wh.X, 0).Apply(m)
-	p3 := V(1, 1).Apply(m)
+	p3 := V(wh.X, wh.Y).Apply(m)
-	p4 := V(0, 1).Apply(m)
+	p4 := V(0, wh.Y).Apply(m)
-	return Points{p1, p2, p3, p4}
+	return Vertices{p1, p2, p3, p4}
 }
 
 func (r Rectangle) Edges() Edges {
@@ -63,15 +66,6 @@ type DrawableRectangle struct {
 	// Will be ignored if the Shader
 	// field is not nil.
 	Colority
-	
-	// Should be draw or not.
-	Visibility
-	Collidability
-}
-
-// Check whether the drawable rectangle should be drawn.
-func (r *DrawableRectangle) IsVisible() bool {
-	return r.Visible
 }
 
 func (r *DrawableRectangle) Draw(c *Context) []EVertex {

sprite.go

@@ -11,8 +11,6 @@ type Sprite struct {
 	ShaderOptions
 	Floating bool
 	Visibility
-	Collidability
-	Resolvability
 }
 
 var (
@@ -25,7 +23,7 @@ func (s *Sprite) Draw(c *Context) []EVertex {
 		return nil
 	}
 	
-	t := s.Rectangle().Transform
+	t := s.RectangleToDraw().Transform
 	m := t.Matrix()
 	if !s.Floating {
 		m.Concat(c.Camera.RealMatrix())
@@ -49,10 +47,10 @@ func (s *Sprite) Draw(c *Context) []EVertex {
 	return nil
 }
 
-// Return the rectangle that contains the sprite.
+// Return the rectangle that contains the sprite to draw.
-func (s *Sprite) Rectangle() Rectangle {
+func (s *Sprite) RectangleToDraw() Rectangle {
 	if s.Images[0] == nil {
-		panic("trying to get rectangle for nil image pointer")
+		return Rectangle{}
 	}
 	
 	w, h := s.Images[0].Size()
@@ -65,9 +63,38 @@ func (s *Sprite) Rectangle() Rectangle {
 	}
 }
 
+// Return the rectangle that contains the sprite in the engine.
+func (s *Sprite) Rectangle() Rectangle {
+	if s.Images[0] == nil {
+		return Rectangle{
+			Transform: s.Transform,
+		}
+	}
+	
+	w, h := s.Images[0].Size()
+	t := s.Transform
+	
+	return Rectangle{
+		Transform: t,
+		Width: Float(w),
+		Height: Float(h),
+	}
+}
+
 // Get triangles of the rectangle that contains the sprite
 // and has the same widght and height.
 func (s *Sprite) MakeTriangles() Triangles {
 	return s.Rectangle().MakeTriangles()
 }
 
+func (s *Sprite) Vertices() Vertices {
+	return s.Rectangle().Vertices()
+}
+
+func (s *Sprite) Edges() Edges {
+	return s.Rectangle().Edges()
+}
+
+func (s *Sprite) ContainedPoints(pts Points) Points {
+	return s.Rectangle().ContainedPoints(pts)
+}