mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 14:31:12 +08:00
71 lines
2.3 KiB
Go
71 lines
2.3 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package ofdgo
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import (
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"context"
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"fmt"
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"math"
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"github.com/xiaoqidun/pdfgo"
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)
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// pdfThreeDSections 按XYZ顺序构造剖切方向，中心保持为世界坐标固定点
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// 入参: ctx 取消上下文, sections PDF剖切面, options 绘制选项
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// 返回: error 方向、预算或取消错误
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func pdfThreeDSections(ctx context.Context, sections []pdfgo.ThreeDCrossSection, options *U3DRenderOptions) error {
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if len(sections) == 0 {
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return nil
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}
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limit := options.MaxMemoryBytes
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if limit == 0 {
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limit = u3dDefaultBytes
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}
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if limit <= 0 || uint64(len(sections)) >= uint64(limit)/136 {
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return fmt.Errorf("PDF 3D section memory exceeds limit")
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}
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options.MaxMemoryBytes = limit - int64(len(sections))*136
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options.Sections = make([]U3DCrossSection, len(sections))
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for i, source := range sections {
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if err := ctx.Err(); err != nil {
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return err
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}
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if source.Axis < 0 || source.Axis > 2 {
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return fmt.Errorf("invalid PDF 3D section axis")
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}
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section := U3DCrossSection{Center: source.Center, Color: source.Color, Opacity: source.Opacity}
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section.AxisU[(source.Axis+1)%3], section.AxisV[(source.Axis+2)%3] = 1, 1
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for axis, angle := range source.Rotation {
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if axis == source.Axis {
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continue
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}
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if !finite(angle) {
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return fmt.Errorf("invalid PDF 3D section rotation")
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}
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sin, cos := math.Sincos(math.Remainder(angle, 360) * math.Pi / 180)
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a, b := (axis+1)%3, (axis+2)%3
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for _, vector := range []*[3]float64{§ion.AxisU, §ion.AxisV} {
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vector[a], vector[b] = cos*vector[a]-sin*vector[b], sin*vector[a]+cos*vector[b]
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}
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}
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if source.IntersectionVisible {
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color := source.IntersectionColor
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section.Intersection = &color
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}
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options.Sections[i] = section
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}
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return nil
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}
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