- 摄像头:自绘东围墙场景(Camera/scene.svg),按云台位置切成 640×480 帧(build-frames.ts); Pan 每次转一格,红外对射被遮挡时画面出现翻墙的人;类名、委托、事件参数与教材 dll 一致, ImageRead 每 250 ms 在后台线程触发 - Image / Bitmap 保存真实图片数据:Save、FromFile、FromStream,文件夹不存在时报 GDI+ 一般性错误; 图片每张只发给浏览器一次(按内容哈希缓存) - 程序所在目录(AppDomain.CurrentDomain.BaseDirectory,编译检查单独放行)和当前目录指向可写的 bin/Debug, 沙箱里在沙箱的临时目录 - PictureBox(SizeMode、BorderStyle);设计器工具箱加"图片框";运行区显示程序保存的图片,点开看大图; 实训台摄像头图标显示开启状态 - 评分规则加图片框显示图片、摄像头开关与转向、保存图片三种检查;示例 p4-t2-网络摄像机 - 测试:摄像头端到端、图片读写与程序目录、AppDomain 编译检查、评分出错情况 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
59 lines
2.3 KiB
C#
59 lines
2.3 KiB
C#
using System;
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using System.Collections;
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using System.Drawing;
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using System.Globalization;
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using System.Text.Json.Nodes;
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using System.Windows.Forms;
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namespace Sim.Host;
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/// <summary>把控件属性值转换成发给浏览器的 JSON(格式见 web/src/winforms/format.ts)</summary>
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public static class PropValue
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{
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public static JsonNode? From(object? value) => value switch
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{
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null => null,
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string s => JsonValueOf(s),
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bool b => JsonValueOf(b),
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char c => JsonValueOf(c == '\0' ? "" : c.ToString()),
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int or long or short or byte => JsonValueOf(Convert.ToInt64(value, CultureInfo.InvariantCulture)),
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float or double or decimal => JsonValueOf(Convert.ToDouble(value, CultureInfo.InvariantCulture)),
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Enum e => JsonValueOf(e.ToString()),
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Point p => new JsonObject { ["x"] = p.X, ["y"] = p.Y },
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Size s => new JsonObject { ["width"] = s.Width, ["height"] = s.Height },
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Color c => ColorCss(c),
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Font f => new JsonObject
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{
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["family"] = f.Name,
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["size"] = f.SizeInPoints,
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["bold"] = f.Bold,
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["italic"] = f.Italic,
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["underline"] = f.Underline,
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["strikeout"] = f.Strikeout,
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},
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Image image => new JsonObject { ["key"] = SimHost.ImageKey(image), ["width"] = image.Width, ["height"] = image.Height },
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Padding p => new JsonObject { ["left"] = p.Left, ["top"] = p.Top, ["right"] = p.Right, ["bottom"] = p.Bottom },
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IEnumerable list => ListOf(list),
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_ => JsonValueOf(value.ToString() ?? ""),
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};
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/// <summary>未设置的颜色(Color.Empty)返回 null,表示沿用父控件的颜色</summary>
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public static JsonNode? ColorCss(Color color)
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{
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if (color.IsEmpty) return null;
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if (color.A == 0) return "transparent";
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if (color.A < 255)
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return $"rgba({color.R},{color.G},{color.B},{(color.A / 255.0).ToString("0.###", CultureInfo.InvariantCulture)})";
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return $"#{color.R:x2}{color.G:x2}{color.B:x2}";
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}
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private static JsonArray ListOf(IEnumerable items)
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{
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var array = new JsonArray();
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foreach (var item in items) array.Add(From(item));
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return array;
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}
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private static JsonNode JsonValueOf<T>(T value) => JsonValue.Create(value)!;
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}
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