Golang Vec2.X方法代码示例

func SegmentCircleIntersect(radius float32, center, start, finish mgl32.Vec2) (mgl32.Vec2, error) {
	d := finish.Sub(start)
	f := start.Sub(center)

	a := d.Dot(d)
	b := f.Mul(2).Dot(d)
	c := f.Dot(f) - radius*radius
	discriminant := b*b - 4*a*c

	if discriminant < 0 {
		return mgl32.Vec2{}, fmt.Errorf("No intersection")
	} else {
		discriminant = float32(math.Sqrt(float64(discriminant)))

		t1 := (-b - discriminant) / (2 * a)
		t2 := (-b + discriminant) / (2 * a)

		if t1 >= 0 && t1 <= 1 {
			return mgl32.Vec2{start.X() + t1*d.X(), start.Y() + t1*d.Y()}, nil
		}
		if t2 >= 0 && t2 <= 1 {
			return mgl32.Vec2{start.X() + t2*d.X(), start.Y() + t2*d.Y()}, nil
		}
	}

	return mgl32.Vec2{}, fmt.Errorf("No intersections")
}

func (ai *AI) moveAlongPath(targetPosition mgl32.Vec2, path []graph.Node) {
	minDistance2 := square(float32(ai.Me.Size) + costMapReduction*1.3)

	var pathNode *mapNode
	var pathVecs []mgl32.Vec2
	for _, rawNode := range path {
		node := rawNode.(*mapNode)
		pos := mgl32.Vec2{float32(node.X) * costMapReduction, float32(node.Y) * costMapReduction}

		if pathNode == nil && dist2(ai.Me.Position, pos) >= minDistance2 {
			pathNode = node
		}

		pathVecs = append(pathVecs, pos)
	}

	if pathNode == nil {
		ai.addStatusMessage("Failed to find path node that was far enough away. Moving directly to objective.")

		ai.Path = []mgl32.Vec2{ai.Me.Position, targetPosition}
		ai.g.SetTargetPos(targetPosition.X(), targetPosition.Y())
		return
	}

	ai.Path = pathVecs
	ai.g.SetTargetPos(float32(pathNode.X*costMapReduction), float32(pathNode.Y*costMapReduction))
}

func (ai *AI) getPseudoMe() *agario.Cell {
	firstCell := ai.OwnCells[0]
	me := &agario.Cell{
		ID:   firstCell.ID,
		Name: firstCell.Name,

		Heading: firstCell.Heading,

		Color: firstCell.Color,

		IsVirus: firstCell.IsVirus,
	}
	var avgPosition mgl32.Vec2
	for _, cell := range ai.OwnCells {
		me.Size += cell.Size

		if avgPosition.X() == 0 && avgPosition.Y() == 0 {
			avgPosition = cell.Position
			continue
		}

		avgPosition = avgPosition.Add(cell.Position)
	}

	n := float32(len(ai.OwnCells))
	avgPosition[0] = avgPosition[0] / n
	avgPosition[1] = avgPosition[1] / n
	me.Position = avgPosition

	return me
}

func (s *Sprite) textureBounds(textureBounds mgl32.Vec2) render.UniformSprite {
	return render.NewUniformSprite(
		s.bounds.X()/textureBounds.X(),
		s.bounds.Y()/textureBounds.Y(),
		s.offset.X()/textureBounds.X(),
		1.0-(s.offset.Y()+s.bounds.Y()-1.0)/textureBounds.Y(),
	)
}

func (te *TextElement) updateImage(size mgl32.Vec2) {
	// Initialize the context.
	bg := image.Transparent
	c := te.getContext()

	text := te.GetHiddenText()
	if len(text) == 0 {
		text = te.props.placeholder
		r, g, b, _ := te.props.textColor.RGBA()
		placeholderColor := color.RGBA{uint8(r), uint8(g), uint8(b), 80}
		c.SetSrc(image.NewUniform(placeholderColor))
	}

	// Establish image dimensions and do word wrap
	textHeight := c.PointToFixed(float64(te.props.textSize))
	var width int
	var height int = int(textHeight >> 6)
	words := strings.Split(text, " ")
	lines := []string{""}
	lineNb := 0
	for _, word := range words {
		wordWithSpace := fmt.Sprintf("%v ", word)
		dimensions, _ := c.StringDimensions(wordWithSpace)
		width += int(dimensions.X >> 6)
		if width > int(size.X()) {
			width = int(dimensions.X >> 6)
			height += int(dimensions.Y>>6) + 1
			lines = append(lines, "")
			lineNb += 1
		}
		lines[lineNb] = fmt.Sprintf("%v%v", lines[lineNb], wordWithSpace)
	}
	if te.props.height > 0 {
		height = int(te.props.height)
	}

	rgba := image.NewRGBA(image.Rect(0, 0, int(size.X()), height+int(textHeight>>6)/3))
	draw.Draw(rgba, rgba.Bounds(), bg, image.ZP, draw.Src)
	c.SetClip(rgba.Bounds())
	c.SetDst(rgba)

	// Draw the text.
	pt := freetype.Pt(0, int(textHeight>>6))
	for _, line := range lines {
		_, err := c.DrawString(line, pt)
		if err != nil {
			log.Printf("Error drawing string: %v\n", err)
			return
		}
		pt.Y += textHeight
	}

	te.img.SetImage(imaging.FlipV(rgba))
	te.img.SetWidth(float32(rgba.Bounds().Size().X))
	te.img.SetHeight(float32(rgba.Bounds().Size().Y))
}

func (r *SplashRenderer) splashConfig(sheet *twodee.Spritesheet, pt mgl32.Vec2, name string) twodee.SpriteConfig {
	frame := sheet.GetFrame(name)
	return twodee.SpriteConfig{
		View: twodee.ModelViewConfig{
			pt.X() + frame.Width/2.0, pt.Y() + frame.Height/2.0, 0.0, // Center
			0, 0, 0,
			1.0, 1.0, 1.0,
		},
		Frame: frame.Frame,
	}
}

func (h *HudLayer) cursorSpriteConfig(sheet *twodee.Spritesheet, pt mgl32.Vec2, cursor string) twodee.SpriteConfig {
	frame := sheet.GetFrame(cursor)
	return twodee.SpriteConfig{
		View: twodee.ModelViewConfig{
			pt.X(), pt.Y(), 0.0,
			0, 0, 0,
			1.0, 1.0, 1.0,
		},
		Frame: frame.Frame,
	}
}

func (h *HudLayer) highlightSpriteConfig(sheet *twodee.Spritesheet, pt mgl32.Vec2, name string) twodee.SpriteConfig {
	frame := sheet.GetFrame(name)
	return twodee.SpriteConfig{
		View: twodee.ModelViewConfig{
			pt.X() + frame.Width/2.0, pt.Y() + frame.Height/6.0, 0.0, // Left aligned
			0, 0, 0,
			1.0, 1.0, 1.0,
		},
		Frame: frame.Frame,
	}
}

func (c *Camera) ScreenToWorldCoords(screenCoords mgl32.Vec2) mgl32.Vec2 {
	// http://stackoverflow.com/questions/7692988/
	var (
		half = c.ScreenSize.Mul(0.5)
		pt   = mgl32.Vec2{
			(screenCoords.X() - half.X()) / half.X(),
			(half.Y() - screenCoords.Y()) / half.Y(),
		}
	)
	return c.unproject(pt)
}

func (te *TextElement) Render(size, offset mgl32.Vec2) mgl32.Vec2 {
	te.props.size, te.props.offset = size, offset
	textWidth, textHeight := size.X(), size.Y()
	if te.props.width > 0 {
		textWidth = te.props.width
	}
	if te.props.height > 0 {
		textHeight = te.props.height
	}
	if te.previousProps != te.props {
		te.updateImage(mgl32.Vec2{textWidth, textHeight})
		te.previousProps = te.props
	}
	return te.img.Render(size, offset)
}

func (ie *ImageElement) Render(size, offset mgl32.Vec2) mgl32.Vec2 {
	ie.size, ie.offset = size, offset
	width, height := ie.getWidth(size.X()), ie.getHeight(size.X())
	if ie.img != nil {
		if width <= 0 && height <= 0 {
			width = float32(ie.img.Bounds().Size().X)
			height = float32(ie.img.Bounds().Size().Y)
		} else if width <= 0 {
			width = height * float32(ie.img.Bounds().Size().X) / float32(ie.img.Bounds().Size().Y)
		} else if height <= 0 {
			height = width * float32(ie.img.Bounds().Size().Y) / float32(ie.img.Bounds().Size().X)
		}
	}
	imgSize := mgl32.Vec2{width, height}
	ie.node.SetScale(imgSize.Vec3(0))
	ie.node.SetTranslation(offset.Vec3(0))
	ie.offset = offset
	ie.Hitbox.SetSize(imgSize)
	return imgSize
}

func createTextVertices(text string, position mgl32.Vec2, size float32, font *Font) (vertices []mgl32.Vec2, uvs []mgl32.Vec2) {
	x := position.X()
	y := float32(currentWindow.Height()) - position.Y()

	for c, char := range text {
		i := float32(c)

		upLeft := mgl32.Vec2{x + i*size, y + size}
		upRight := mgl32.Vec2{x + i*size + size, y + size}
		downRight := mgl32.Vec2{x + i*size + size, y}
		downLeft := mgl32.Vec2{x + i*size, y}

		vertices = append(vertices, upLeft, downLeft, upRight)
		vertices = append(vertices, downRight, upRight, downLeft)

		glyph := font.font.Glyphs().Find(string(char))
		fullWidth := float32(font.font.Width)
		fullHeight := float32(font.font.Height)
		width := float32(glyph.Width)
		height := float32(glyph.Height)
		x := float32(glyph.X)
		y := float32(glyph.Y)

		uvX := x / fullWidth
		uvY := (fullHeight - y) / fullHeight
		uvWidth := width / fullWidth
		uvHeight := height / fullHeight

		uvUpLeft := mgl32.Vec2{uvX, uvY}
		uvUpRight := mgl32.Vec2{uvX + uvWidth, uvY}
		uvDownRight := mgl32.Vec2{uvX + uvWidth, uvY - uvHeight}
		uvDownLeft := mgl32.Vec2{uvX, uvY - uvHeight}

		uvs = append(uvs, uvUpLeft, uvDownLeft, uvUpRight)
		uvs = append(uvs, uvDownRight, uvUpRight, uvDownLeft)
	}

	return
}

func (m *Mob) moveTowardExit(elapsed time.Duration, level *Level) {
	var (
		dest     mgl32.Vec2
		ok       bool
		pct      = float32(elapsed) / float32(time.Second)
		gridDist mgl32.Vec2
		goalDist int32
		stepDist = pct * m.Speed
	)
	if dest, goalDist, ok = level.Grid.GetNextStepToSink(m.Pos); !ok {
		return
	}
	gridDist = dest.Sub(m.Pos)
	if goalDist == 1 && gridDist.Len() < stepDist+0.5 {
		m.PendingDisable = true
	}
	if gridDist.X() > 0 {
		m.swapState(Left, Right)
	} else {
		m.swapState(Right, Left)
	}
	m.Pos = m.Pos.Add(gridDist.Normalize().Mul(stepDist))
}

func (ai *AI) movePathed(position mgl32.Vec2) {
	minDistance2 := square(float32(ai.Me.Size) + costMapReduction*1.3)

	if dist2(ai.Me.Position, position) < minDistance2 {
		ai.addStatusMessage("Objective is within minimum distance. Moving directly to objective.")

		ai.Path = []mgl32.Vec2{ai.Me.Position, position}
		ai.g.SetTargetPos(position.X(), position.Y())
		return
	}

	// meNode := ai.Map.GetNode(gameToCostMap(ai.Me.Position.Elem()))
	// positionNode := ai.Map.GetNode(gameToCostMap(position.Elem()))

	// path, cost, nodes := search.AStar(meNode, positionNode, ai.Map, nil, nil)
	// if path == nil {
	// 	ai.addStatusMessage("Failed to find path. Trying undirected.")

	// 	ai.movePathedUndirected(position)
	// 	return
	// }
	// ai.addStatusMessage(fmt.Sprintf("A*: path cost: %.2f / nodes expanded: %d", cost, nodes))

	positionNode := ai.Map.GetNode(gameToCostMap(position.Elem()))
	path, cost := ai.DijkstraMap.To(positionNode)
	if path == nil {
		ai.addStatusMessage("movePathed: Failed to find path. Moving directly to objective.")

		ai.Path = []mgl32.Vec2{ai.Me.Position, position}
		ai.g.SetTargetPos(position.X(), position.Y())
		return
	}

	ai.addStatusMessage(fmt.Sprintf("movePathed: path cost: %.2f", cost))

	ai.moveAlongPath(position, path)
}

func (c *Container) Render(size, offset mgl32.Vec2) mgl32.Vec2 {
	c.size, c.offset = size, offset
	padding := convertMargin(c.padding, c.paddingPercent, size.X())
	margin := convertMargin(c.margin, c.marginPercent, size.X())
	sizeMinusMargins := size.Sub(mgl32.Vec2{
		margin.Left + margin.Right + padding.Left + padding.Right,
		margin.Top + margin.Bottom + padding.Top + padding.Bottom,
	})
	containerSize := sizeMinusMargins
	if c.width > 0 {
		containerSize[0] = c.getWidth(size.X()) - padding.Left - padding.Right
	}
	if c.height > 0 {
		containerSize[1] = c.getHeight(size.X()) - padding.Top - padding.Bottom
	}
	var width, height, highest float32 = 0, 0, 0
	for _, child := range c.children {
		childSize := child.Render(containerSize, mgl32.Vec2{width, height})
		width += childSize.X()
		if width > containerSize.X() {
			height += highest
			highest = 0
			childSize = child.Render(containerSize, mgl32.Vec2{0, height})
			width = childSize.X()
		}
		if childSize.Y() > highest {
			highest = childSize.Y()
		}
	}
	height += highest
	if mgl32.FloatEqual(c.height, 0) {
		containerSize[1] = height
	}
	//offsets and sizes
	c.backgroundOffset = mgl32.Vec2{margin.Left, margin.Top}
	c.elementsOffset = mgl32.Vec2{margin.Left + padding.Left, margin.Top + padding.Top}
	backgroundSize := containerSize.Add(mgl32.Vec2{padding.Left + padding.Right, padding.Top + padding.Bottom})
	totalSize := backgroundSize.Add(mgl32.Vec2{margin.Left + margin.Right, margin.Top + margin.Bottom})

	c.background.SetScale(backgroundSize.Vec3(0))
	c.background.SetTranslation(c.backgroundOffset.Vec3(0))
	c.elementsNode.SetTranslation(c.elementsOffset.Vec3(0))
	c.node.SetTranslation(c.offset.Vec3(0))
	c.Hitbox.SetSize(backgroundSize)
	return totalSize
}