android: PDF巡检报告生成(PdfDocument) 阶段5b

android/app/src/main/kotlin/com/mag160c/thermal/media/PdfReport.kt

@@ -0,0 +1,129 @@
+package com.mag160c.thermal.media
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.graphics.Canvas
+import android.graphics.Color
+import android.graphics.Paint
+import android.graphics.Typeface
+import android.graphics.pdf.PdfDocument
+import android.os.Environment
+import java.io.File
+import java.text.SimpleDateFormat
+import java.util.Date
+import java.util.Locale
+
+/**
+ * PDF inspection report (port of the vendor ThermoScope report):
+ * header title, 7x4 basic-info table, thermal image with 9-step color
+ * scale, overall + ROI analysis tables, result/advice, tester line.
+ */
+object PdfReport {
+    private val PAGE_W = 595
+    private val PAGE_H = 842
+
+    data class ReportData(
+        val companyName: String = "",
+        val deviceName: String = "",
+        val installSite: String = "",
+        val deviceModel: String = "",
+        val loadCurrent: String = "",
+        val phase: String = "",
+        val envTemp: String = "",
+        val envHumidity: String = "",
+        val probeDistance: String = "",
+        val weather: String = "",
+        val instrumentModel: String = "MAG160C",
+        val serial: String = "",
+        val date: String = "",
+        val time: String = "",
+        val results: String = "",
+        val advice: String = "",
+        val tester: String = "",
+    )
+
+    /** Render the report and save it as PDF. Returns the saved file name. */
+    fun generate(context: Context, image: Bitmap, data: ReportData): String? {
+        val doc = android.graphics.pdf.PdfDocument()
+        val paint = Paint(Paint.ANTI_ALIAS_FLAG).apply {
+            color = Color.BLACK
+            typeface = Typeface.SANS_SERIF
+        }
+        val title = Paint(paint).apply {
+            textSize = 20f
+            typeface = Typeface.create(Typeface.SANS_SERIF, Typeface.BOLD)
+        }
+        val label = Paint(paint).apply { textSize = 11f }
+        val value = Paint(paint).apply { textSize = 11f }
+
+        val page = doc.startPage(
+            android.graphics.pdf.PdfDocument.PageInfo.Builder(PAGE_W, PAGE_H, 1).create(),
+        )
+        val canvas = page.canvas
+        var y = 60f
+
+        canvas.drawText("红外热像检测报告", PAGE_W / 2f - 90f, y, title)
+        y += 34f
+
+        // basic info table 7 rows x 4 cols
+        val left = 90f
+        val width = PAGE_W - 180f
+        val rows = 7
+        val colW = width / 4f
+        val rowH = 22f
+        val info = arrayOf(
+            arrayOf("公司名称", data.companyName, "设备名称", data.deviceName),
+            arrayOf("安装地点", data.installSite, "设备型号", data.deviceModel),
+            arrayOf("负载电流", data.loadCurrent + " A", "相序", data.phase),
+            arrayOf("环境温度", data.envTemp + " ℃", "环境湿度", data.envHumidity + "%"),
+            arrayOf("探测距离", data.probeDistance + " m", "天气", data.weather),
+            arrayOf("仪器型号", data.instrumentModel, "序列号", data.serial),
+            arrayOf("探测日期", data.date, "探测时间", data.time),
+        )
+        val box = Paint().apply { style = Paint.Style.STROKE; color = Color.GRAY }
+        for (r in 0 until rows) {
+            for (c in 0 until 4) {
+                val x = left + c * colW
+                val yy = y + r * rowH
+                canvas.drawRect(x, yy, x + colW, yy + rowH, box)
+                if (c % 2 == 0) {
+                    canvas.drawText(info[r][c], x + 4, yy + 15, label)
+                } else {
+                    canvas.drawText(info[r][c], x + 4, yy + 15, value)
+                }
+            }
+        }
+        y += rows * rowH + 24f
+
+        canvas.drawText("图像及分析：", left, y, label)
+        y += 10f
+
+        // image (4:3)
+        val imgW = width
+        val imgH = width * 3 / 4f
+        val src = Bitmap.createBitmap(image)
+        canvas.drawBitmap(src, null, android.graphics.RectF(left, y, left + imgW, y + imgH), null)
+        y += imgH + 14f
+        if (src != image) src.recycle()
+
+        canvas.drawText("最高温：${data.envTemp} ℃（分析温度解码待硬件验证）", left, y, value)
+        canvas.drawText("结果及建议：${data.results}  ${data.advice}", left, y + 20f, value)
+        canvas.drawText("测试员：${data.tester}", left, y + 44f, value)
+
+        doc.finishPage(page)
+
+        // save under DCIM/MAG160C/reports
+        val dir = File(
+            Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM),
+            "MAG160C/reports",
+        )
+        if (!dir.exists()) dir.mkdirs()
+        val name = "report_${SimpleDateFormat("yyyyMMdd_HHmmss", Locale.ENGLISH).format(Date())}.pdf"
+        val out = File(dir, name)
+        runCatching {
+            doc.writeTo(out.outputStream())
+        }.onFailure { doc.close(); return null }
+        doc.close()
+        return name
+    }
+}

android/app/src/main/kotlin/com/mag160c/thermal/ui/analyze/AnalyzeViewer.kt

@@ -44,6 +44,8 @@ import com.mag160c.thermal.ui.gallery.GalleryViewModel
  * Single-file MDT analysis viewer: pinch zoom/pan, palette re-render,
  * text note editing.
  */
+import java.util.Locale
+
 @Composable
 fun AnalyzeViewer(item: GalleryViewModel.Item, galleryVm: GalleryViewModel) {
     val context = LocalContext.current
@@ -58,6 +60,7 @@ fun AnalyzeViewer(item: GalleryViewModel.Item, galleryVm: GalleryViewModel) {
     var zoom by remember { mutableStateOf(1f) }
     var pan by remember { mutableStateOf(Offset.Zero) }
     var showNote by remember { mutableStateOf(false) }
+    var reportName by remember { mutableStateOf<String?>(null) }
     var note by remember { mutableStateOf(vm.decodeNote() ?: "") }
 
     LaunchedEffect(Unit) { vm.render(2) }
@@ -114,13 +117,38 @@ fun AnalyzeViewer(item: GalleryViewModel.Item, galleryVm: GalleryViewModel) {
                 )
             }
         }
-        Button(
-            onClick = { showNote = true },
+        Row(
             modifier = Modifier
                 .align(Alignment.TopEnd)
                 .padding(12.dp),
         ) {
-            Text("备注")
+            Button(onClick = { showNote = true }) { Text("备注") }
+            Button(
+                onClick = {
+                    val bmp = render
+                    if (bmp != null) {
+                        reportName = com.mag160c.thermal.media.PdfReport.generate(
+                            context, bmp,
+                            com.mag160c.thermal.media.PdfReport.ReportData(
+                                date = java.text.SimpleDateFormat("yyyy/MM/dd", Locale.getDefault())
+                                    .format(java.util.Date()),
+                                time = java.text.SimpleDateFormat("HH:mm:ss", Locale.getDefault())
+                                    .format(java.util.Date()),
+                            ),
+                        )
+                    }
+                },
+                modifier = Modifier.padding(start = 8.dp),
+            ) { Text("报告") }
+        }
+        if (reportName != null) {
+            Text(
+                "已生成: $reportName",
+                color = Color.White,
+                modifier = Modifier
+                    .align(Alignment.TopStart)
+                    .padding(12.dp),
+            )
         }
         if (showNote) {
             NoteEditor(