96 lines
2.4 KiB
Go
96 lines
2.4 KiB
Go
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// Package skin_renderer 实现 Minecraft 皮肤的 3D 渲染
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// 移植自 blessing/texture-renderer
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package skin_renderer
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// Point 表示 3D 空间中的一个点
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type Point struct {
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// 原始坐标
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originX, originY, originZ float64
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// 投影后的坐标
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destX, destY, destZ float64
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// 是否已投影
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isProjected bool
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isPreProjected bool
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}
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// NewPoint 创建一个新的 3D 点
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func NewPoint(x, y, z float64) *Point {
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return &Point{
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originX: x,
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originY: y,
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originZ: z,
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}
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}
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// Project 将 3D 点投影到 2D 平面
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// 使用欧拉角旋转：alpha 为垂直旋转（X轴），omega 为水平旋转（Y轴）
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func (p *Point) Project(cosAlpha, sinAlpha, cosOmega, sinOmega float64, minX, maxX, minY, maxY *float64) {
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x := p.originX
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y := p.originY
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z := p.originZ
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// 3D 旋转投影公式
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p.destX = x*cosOmega + z*sinOmega
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p.destY = x*sinAlpha*sinOmega + y*cosAlpha - z*sinAlpha*cosOmega
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p.destZ = -x*cosAlpha*sinOmega + y*sinAlpha + z*cosAlpha*cosOmega
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p.isProjected = true
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// 更新边界
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if p.destX < *minX {
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*minX = p.destX
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}
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if p.destX > *maxX {
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*maxX = p.destX
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}
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if p.destY < *minY {
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*minY = p.destY
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}
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if p.destY > *maxY {
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*maxY = p.destY
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}
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}
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// PreProject 预投影，用于部件独立旋转（如头部、手臂）
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// dx, dy, dz 为旋转中心点
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func (p *Point) PreProject(dx, dy, dz, cosAlpha, sinAlpha, cosOmega, sinOmega float64) {
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if p.isPreProjected {
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return
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}
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// 相对于旋转中心的坐标
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x := p.originX - dx
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y := p.originY - dy
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z := p.originZ - dz
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// 旋转后加回偏移
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p.originX = x*cosOmega + z*sinOmega + dx
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p.originY = x*sinAlpha*sinOmega + y*cosAlpha - z*sinAlpha*cosOmega + dy
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p.originZ = -x*cosAlpha*sinOmega + y*sinAlpha + z*cosAlpha*cosOmega + dz
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p.isPreProjected = true
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}
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// GetDestCoord 获取投影后的坐标
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func (p *Point) GetDestCoord() (x, y, z float64) {
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return p.destX, p.destY, p.destZ
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}
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// GetOriginCoord 获取原始坐标
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func (p *Point) GetOriginCoord() (x, y, z float64) {
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return p.originX, p.originY, p.originZ
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}
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// IsProjected 返回是否已投影
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func (p *Point) IsProjected() bool {
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return p.isProjected
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}
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// GetDepth 获取深度值（用于排序）
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func (p *Point) GetDepth(cosAlpha, sinAlpha, cosOmega, sinOmega float64, minX, maxX, minY, maxY *float64) float64 {
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if !p.isProjected {
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p.Project(cosAlpha, sinAlpha, cosOmega, sinOmega, minX, maxX, minY, maxY)
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}
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return p.destZ
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}
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