258 lines
14 KiB
C#
258 lines
14 KiB
C#
using System.Globalization;
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using System.Security;
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using System.Text;
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using QuestPDF.Fluent;
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using QuestPDF.Helpers;
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using QuestPDF.Infrastructure;
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namespace LehrerApp.Templating;
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public sealed class QuestTemplateRenderer : ITemplateRenderer, ITemplatePreviewRenderer
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{
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static QuestTemplateRenderer() => QuestPDF.Settings.License = LicenseType.Community;
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public byte[] RenderToPdf(LoadedTemplate template, ITemplateDataProvider data) =>
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BuildDocument(template, ValidateData(template, data)).GeneratePdf();
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public byte[] RenderFirstPageToPng(LoadedTemplate template, ITemplateDataProvider data, int dpi = 120)
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{
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var settings = new ImageGenerationSettings { ImageFormat = ImageFormat.Png, RasterDpi = dpi };
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return BuildDocument(template, ValidateData(template, data)).GenerateImages(settings).First();
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}
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private static IReadOnlyDictionary<string, PlaceholderValue> ValidateData(LoadedTemplate template,
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ITemplateDataProvider provider)
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{
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var values = TemplateDataResolver.Resolve(template.Manifest, provider.GetValues());
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var validation = new TemplateLoader().Validate(template, values.ToDictionary(x => x.Key, x => x.Value.Type));
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if (!validation.IsValid) throw new TemplateValidationException(validation);
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return values;
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}
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private static IDocument BuildDocument(LoadedTemplate template,
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IReadOnlyDictionary<string, PlaceholderValue> values) => Document.Create(document =>
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{
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document.Page(page =>
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{
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page.Size(UnitConverter.Points(template.Layout.Width, template.Layout.Unit),
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UnitConverter.Points(template.Layout.Height, template.Layout.Unit));
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page.Margin(0);
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page.Content().Layers(layers =>
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{
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layers.PrimaryLayer().Width(UnitConverter.Points(template.Layout.Width, template.Layout.Unit))
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.Height(UnitConverter.Points(template.Layout.Height, template.Layout.Unit)).Background(Colors.White);
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foreach (var element in template.Layout.Elements)
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{
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var current = element;
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layers.Layer().Element(container => RenderElement(container, current, template, values));
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}
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});
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});
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});
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private static void RenderElement(IContainer root, TemplateElement element, LoadedTemplate template,
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IReadOnlyDictionary<string, PlaceholderValue> values)
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{
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var unit = template.Layout.Unit;
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switch (element)
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{
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case BackgroundElement background:
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root.Width(UnitConverter.Points(template.Layout.Width, unit))
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.Height(UnitConverter.Points(template.Layout.Height, unit))
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.Image(GetAsset(template, background.Path)).FitArea();
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break;
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case ImageElement image:
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var imageScale = image.Attributes.TryGetValue("scale", out var scale)
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? LayoutParser.Percentage(scale) : 1f;
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Position(root, image, unit, imageScale).Image(GetAsset(template, image.Path)).FitArea();
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break;
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case TextElement text:
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var textContainer = root.TranslateX(UnitConverter.Points(text.X, unit))
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.TranslateY(UnitConverter.Points(text.Y, unit))
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.Width(UnitConverter.Points(Math.Max(0, template.Layout.Width - text.X), unit))
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.Height(QuestTemplateRenderer.ParseFloat(text.Attributes, "size", 11) * 1.8f);
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RenderResolvedText(textContainer, text.Content, text.Placeholder, text.Format,
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values, template.Manifest, text.Attributes);
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break;
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case TextBoxElement box:
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RenderResolvedText(Position(root, box, unit).Shrink(), box.Content, box.Placeholder, box.Format,
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values, template.Manifest, box.Attributes);
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break;
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case TableElement table:
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if (values.GetValueOrDefault(table.Placeholder) is TableValue tableValue)
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TableElementRenderer.Render(Position(root, table, unit), tableValue, table.Attributes);
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break;
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case ChartElement chart:
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if (values.GetValueOrDefault(chart.Placeholder) is ChartValue chartValue)
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ChartElementRenderer.Render(Position(root, chart, unit), chartValue, chart.ChartType, chart.Attributes);
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break;
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}
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}
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private static IContainer Position(IContainer root, TemplateElement element, string unit, float scale = 1) => root
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.TranslateX(UnitConverter.Points(element.X, unit)).TranslateY(UnitConverter.Points(element.Y, unit))
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.Width(UnitConverter.Points(element.Width * scale, unit)).Height(UnitConverter.Points(element.Height * scale, unit));
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private static byte[] GetAsset(LoadedTemplate template, string path) =>
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template.Assets.TryGetValue(TemplateLoader.Normalize(path), out var bytes) ? bytes
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: throw new InvalidDataException($"Asset „{path}“ fehlt.");
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internal static void RenderText(IContainer container, string content, IReadOnlyDictionary<string, string> attributes)
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{
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var aligned = attributes.GetValueOrDefault("align", "left").ToLowerInvariant() switch
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{ "center" => container.AlignCenter(), "right" => container.AlignRight(), _ => container.AlignLeft() };
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var descriptor = aligned.Text(content);
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descriptor.FontSize(ParseFloat(attributes, "size", 11));
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if (ParseBool(attributes, "bold")) descriptor.SemiBold();
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if (ParseBool(attributes, "italic")) descriptor.Italic();
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if (ParseBool(attributes, "underline")) descriptor.Underline();
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if (attributes.TryGetValue("color", out var color)) descriptor.FontColor(color);
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}
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private static void RenderResolvedText(IContainer container, string content, string? placeholder, string? format,
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IReadOnlyDictionary<string, PlaceholderValue> values, TemplateManifest manifest,
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IReadOnlyDictionary<string, string> elementAttributes)
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{
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var attributes = TextAttributes(manifest, placeholder, elementAttributes);
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var definition = placeholder is null ? null
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: manifest.Placeholders.FirstOrDefault(x => x.Name.Equals(placeholder, StringComparison.Ordinal));
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if (definition is { IsConstant: true, Type: PlaceholderType.Text or PlaceholderType.Multiline })
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{
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RenderRichText(container, TemplateRichText.Parse(definition.ConstantValue ?? ""), values, attributes);
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return;
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}
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RenderText(container, ResolveContent(content, placeholder, format, values), attributes);
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}
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private static void RenderRichText(IContainer container, IReadOnlyList<TemplateRichTextRun> runs,
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IReadOnlyDictionary<string, PlaceholderValue> values, IReadOnlyDictionary<string, string> attributes)
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{
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var aligned = attributes.GetValueOrDefault("align", "left").ToLowerInvariant() switch
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{ "center" => container.AlignCenter(), "right" => container.AlignRight(), _ => container.AlignLeft() };
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var fontSize = ParseFloat(attributes, "size", 11);
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var globalBold = ParseBool(attributes, "bold");
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var globalItalic = ParseBool(attributes, "italic");
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var globalUnderline = ParseBool(attributes, "underline");
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attributes.TryGetValue("color", out var color);
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aligned.Text(text =>
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{
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foreach (var run in runs)
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{
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var content = run.Placeholder is null ? run.Text
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: values.TryGetValue(run.Placeholder, out var value) ? Format(value, run.Format) : "";
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var span = text.Span(content).FontSize(fontSize);
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if (globalBold || run.Bold) span.SemiBold();
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if (globalItalic || run.Italic) span.Italic();
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if (globalUnderline || run.Underline) span.Underline();
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if (color is not null) span.FontColor(color);
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}
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});
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}
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private static IReadOnlyDictionary<string, string> TextAttributes(TemplateManifest manifest, string? placeholder,
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IReadOnlyDictionary<string, string> elementAttributes)
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{
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if (placeholder is null) return elementAttributes;
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var definition = manifest.Placeholders.FirstOrDefault(x => x.Name.Equals(placeholder, StringComparison.Ordinal));
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if (definition is null || (!definition.Bold && !definition.Italic && !definition.Underline)) return elementAttributes;
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var result = new Dictionary<string, string>(elementAttributes, StringComparer.OrdinalIgnoreCase);
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if (definition.Bold) result["bold"] = "true";
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if (definition.Italic) result["italic"] = "true";
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if (definition.Underline) result["underline"] = "true";
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return result;
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}
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private static string ResolveContent(string content, string? placeholder, string? format,
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IReadOnlyDictionary<string, PlaceholderValue> values)
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{
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if (placeholder is not null)
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return values.TryGetValue(placeholder, out var value) ? Format(value, format) : "";
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var result = content;
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foreach (var entry in values)
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result = result.Replace("$" + entry.Key, Format(entry.Value, null), StringComparison.Ordinal);
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return result;
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}
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private static string Format(PlaceholderValue value, string? format) => value switch
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{
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TextValue text => text.Value,
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MultilineValue text => text.Value,
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DateValue date => date.Value.ToString(format ?? "d", CultureInfo.GetCultureInfo("de-DE")),
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NumberValue number => number.Value.ToString(format, CultureInfo.GetCultureInfo("de-DE")),
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_ => "",
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};
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internal static float ParseFloat(IReadOnlyDictionary<string, string> attributes, string key, float fallback) =>
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attributes.TryGetValue(key, out var raw) && float.TryParse(raw, NumberStyles.Float,
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CultureInfo.InvariantCulture, out var value) ? value : fallback;
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internal static bool ParseBool(IReadOnlyDictionary<string, string> attributes, string key) =>
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attributes.TryGetValue(key, out var raw) && bool.TryParse(raw, out var value) && value;
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}
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public static class UnitConverter
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{
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public static float Points(float value, string unit) => unit.ToLowerInvariant() switch
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{ "mm" => value * 72f / 25.4f, "cm" => value * 72f / 2.54f, "in" => value * 72f, "pt" => value,
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_ => throw new ArgumentOutOfRangeException(nameof(unit), unit, "Unbekannte Einheit.") };
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}
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internal static class TableElementRenderer
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{
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public static void Render(IContainer container, TableValue value, IReadOnlyDictionary<string, string> attributes)
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{
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if (value.Columns.Count == 0) return;
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var fontSize = QuestTemplateRenderer.ParseFloat(attributes, "size", 9);
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container.Table(table =>
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{
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table.ColumnsDefinition(columns => { foreach (var _ in value.Columns) columns.RelativeColumn(); });
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table.Header(header =>
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{
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foreach (var column in value.Columns)
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header.Cell().Background(Colors.Grey.Lighten2).Border(0.5f).BorderColor(Colors.Grey.Medium)
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.Padding(3).Text(column).FontSize(fontSize).SemiBold();
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});
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foreach (var row in value.Rows)
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for (var i = 0; i < value.Columns.Count; i++)
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table.Cell().Border(0.5f).BorderColor(Colors.Grey.Lighten1).Padding(3)
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.Text(i < row.Count ? row[i] : "").FontSize(fontSize);
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});
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}
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}
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internal static class ChartElementRenderer
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{
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public static void Render(IContainer container, ChartValue value, string chartType,
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IReadOnlyDictionary<string, string> attributes)
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{
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var svg = BuildSvg(value, chartType);
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container.Svg(svg);
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}
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private static string BuildSvg(ChartValue value, string chartType)
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{
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var points = value.Series.SelectMany(x => x.Points).ToList();
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if (points.Count == 0) return "<svg xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"0 0 600 200\"/>";
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var max = Math.Max(1m, points.Max(x => x.Y));
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var colors = new[] { "#2563EB", "#DC2626", "#059669", "#7C3AED" };
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var svg = new StringBuilder("<svg xmlns=\"http://www.w3.org/2000/svg\" viewBox=\"0 0 600 200\">");
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svg.Append("<line x1=\"40\" y1=\"170\" x2=\"590\" y2=\"170\" stroke=\"#94A3B8\"/><line x1=\"40\" y1=\"10\" x2=\"40\" y2=\"170\" stroke=\"#94A3B8\"/>");
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for (var seriesIndex = 0; seriesIndex < value.Series.Count; seriesIndex++)
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{
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var series = value.Series[seriesIndex];
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var color = colors[seriesIndex % colors.Length];
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var step = 530d / Math.Max(1, series.Points.Count);
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var coordinates = new List<string>();
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for (var i = 0; i < series.Points.Count; i++)
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{
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var x = 50 + i * step + step / 2; var y = 165 - (double)(series.Points[i].Y / max) * 145;
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if (chartType == "bar") svg.Append(CultureInfo.InvariantCulture,
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$"<rect x=\"{x - step * .28:F1}\" y=\"{y:F1}\" width=\"{step * .56:F1}\" height=\"{165 - y:F1}\" fill=\"{color}\" opacity=\".8\"/>");
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else coordinates.Add(FormattableString.Invariant($"{x:F1},{y:F1}"));
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svg.Append($"<text x=\"{x:F1}\" y=\"188\" font-size=\"10\" text-anchor=\"middle\" fill=\"#475569\">{SecurityElement.Escape(series.Points[i].X)}</text>");
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}
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if (chartType == "line") svg.Append($"<polyline points=\"{string.Join(' ', coordinates)}\" fill=\"none\" stroke=\"{color}\" stroke-width=\"3\"/>");
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}
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return svg.Append("</svg>").ToString();
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}
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}
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