基于DeepSeek实现PDF嵌入SVG图片无损放大

1. PDF中效果图

2. 询问Deepseek进行代码书写，不断优化后结果

/*** SVG工具类，用于生成价格趋势的SVG图表*/
public class SvgUtils {// SVG画布尺寸private static final int WIDTH = 800;private static final int HEIGHT = 500;private static final int PADDING = 60;// 生成SVG折线图public static String generatePriceTrendSvg(List<PriceData> data, String title, String subtitle) {if (data.isEmpty()) {return "<svg xmlns='http://www.w3.org/2000/svg' width='" + WIDTH + "' height='" + HEIGHT + "'></svg>";}// 计算价格和时间的范围double minPrice = data.stream().mapToDouble(PriceData::getPrice).min().orElse(0) * 0.8;double maxPrice = data.stream().mapToDouble(PriceData::getPrice).max().orElse(1) * 1.2;// 解析最小和最大日期String minYearMonth = data.stream().map(PriceData::getYearmonth).min(String::compareTo).orElse("2024-06");String maxYearMonth = data.stream().map(PriceData::getYearmonth).max(String::compareTo).orElse("2025-01");// 构建SVG内容StringBuilder svg = new StringBuilder();svg.append(String.format("<svg xmlns='http://www.w3.org/2000/svg' width='%d' height='%d'>", WIDTH, HEIGHT));// 画背景svg.append(String.format("<rect width='%d' height='%d' fill='#ffffff'/>", WIDTH, HEIGHT));// 添加标题和副标题（居中显示）svg.append(String.format("<text x='%d' y='%d' font-size='20' font-family='Arial' fill='#333333' font-weight='bold' text-anchor='middle'>%s</text>",WIDTH / 2, 30, title));svg.append(String.format("<text x='%d' y='%d' font-size='14' font-family='Arial' fill='#666666' text-anchor='middle'>%s</text>",WIDTH / 2, 50, subtitle));// 画虚线网格线svg.append(drawGrid(minYearMonth, maxYearMonth, minPrice, maxPrice));// 画深色坐标轴svg.append(drawAxis(minYearMonth, maxYearMonth, minPrice, maxPrice));// 画浅色平滑折线svg.append(drawSmoothLine(data, minYearMonth, maxYearMonth, minPrice, maxPrice));svg.append("</svg>");return svg.toString();}// 画虚线网格线private static String drawGrid(String minYearMonth, String maxYearMonth, double minPrice, double maxPrice) {StringBuilder grid = new StringBuilder();// 水平网格线（价格）int numHorizontalLines = 5;for (int i = 0; i <= numHorizontalLines; i++) {double price = minPrice + (maxPrice - minPrice) * i / numHorizontalLines;int y = HEIGHT - PADDING - (int) ((price - minPrice) * (HEIGHT - 2 * PADDING) / (maxPrice - minPrice));grid.append(String.format("<line x1='%d' y1='%d' x2='%d' y2='%d' stroke='#e0e0e0' stroke-width='1' stroke-dasharray='5,5'/>",PADDING, y, WIDTH - PADDING, y));}// 垂直网格线（时间）List<String> yearMonths = generateYearMonths(minYearMonth, maxYearMonth);for (String yearMonth : yearMonths) {int x = PADDING + (int) ((getMonthIndex(yearMonth) - getMonthIndex(minYearMonth)) * (WIDTH - 2 * PADDING) / (yearMonths.size() - 1));grid.append(String.format("<line x1='%d' y1='%d' x2='%d' y2='%d' stroke='#e0e0e0' stroke-width='1' stroke-dasharray='5,5'/>",x, PADDING, x, HEIGHT - PADDING));}return grid.toString();}// 画深色坐标轴private static String drawAxis(String minYearMonth, String maxYearMonth, double minPrice, double maxPrice) {StringBuilder axis = new StringBuilder();// X轴（时间）axis.append(String.format("<line x1='%d' y1='%d' x2='%d' y2='%d' stroke='#333333' stroke-width='2'/>",PADDING, HEIGHT - PADDING, WIDTH - PADDING, HEIGHT - PADDING));// Y轴（价格）axis.append(String.format("<line x1='%d' y1='%d' x2='%d' y2='%d' stroke='#333333' stroke-width='2'/>",PADDING, PADDING, PADDING, HEIGHT - PADDING));// X轴标签List<String> yearMonths = generateYearMonths(minYearMonth, maxYearMonth);for (String yearMonth : yearMonths) {int x = PADDING + (int) ((getMonthIndex(yearMonth) - getMonthIndex(minYearMonth)) * (WIDTH - 2 * PADDING) / (yearMonths.size() - 1));axis.append(String.format("<text x='%d' y='%d' font-size='12' font-family='Arial' fill='#000000' text-anchor='middle'>%s</text>",x, HEIGHT - PADDING + 20, yearMonth));}// Y轴标签int numYLabels = 5;for (int i = 0; i <= numYLabels; i++) {double price = minPrice + (maxPrice - minPrice) * i / numYLabels;int y = HEIGHT - PADDING - (int) ((price - minPrice) * (HEIGHT - 2 * PADDING) / (maxPrice - minPrice));axis.append(String.format("<text x='%d' y='%d' font-size='12' font-family='Arial' fill='#000000' text-anchor='end'>%.2f</text>",PADDING - 10, y + 5, price));}return axis.toString();}// 画浅色平滑折线private static String drawSmoothLine(List<PriceData> data, String minYearMonth, String maxYearMonth, double minPrice, double maxPrice) {if (data.size() < 2) {return "";}StringBuilder path = new StringBuilder("<path d='M");for (int i = 0; i < data.size(); i++) {PriceData point = data.get(i);int x = PADDING + (int) ((getMonthIndex(point.getYearmonth()) - getMonthIndex(minYearMonth)) * (WIDTH - 2 * PADDING) / (getMonthIndex(maxYearMonth) - getMonthIndex(minYearMonth)));int y = HEIGHT - PADDING - (int) ((point.getPrice() - minPrice) * (HEIGHT - 2 * PADDING) / (maxPrice - minPrice));if (i == 0) {path.append(x).append(",").append(y);} else {// 计算控制点以实现平滑效果PriceData prevPoint = data.get(i - 1);int prevX = PADDING + (int) ((getMonthIndex(prevPoint.getYearmonth()) - getMonthIndex(minYearMonth)) * (WIDTH - 2 * PADDING) / (getMonthIndex(maxYearMonth) - getMonthIndex(minYearMonth)));int prevY = HEIGHT - PADDING - (int) ((prevPoint.getPrice() - minPrice) * (HEIGHT - 2 * PADDING) / (maxPrice - minPrice));int ctrlX1 = (prevX + x) / 2;int ctrlY1 = prevY;int ctrlX2 = (prevX + x) / 2;int ctrlY2 = y;path.append(" C").append(ctrlX1).append(",").append(ctrlY1).append(" ").append(ctrlX2).append(",").append(ctrlY2).append(" ").append(x).append(",").append(y);}}path.append("' fill='none' stroke='#66B3FF' stroke-width='2'/>");return path.toString();}// 生成从 minYearMonth 到 maxYearMonth 的连续月份列表private static List<String> generateYearMonths(String minYearMonth, String maxYearMonth) {List<String> yearMonths = new ArrayList<>();int year = Integer.parseInt(minYearMonth.substring(0, 4));int month = Integer.parseInt(minYearMonth.substring(5));while (true) {yearMonths.add(String.format("%04d-%02d", year, month));if (yearMonths.get(yearMonths.size() - 1).equals(maxYearMonth)) {break;}month++;if (month > 12) {month = 1;year++;}}return yearMonths;}// 将 yearmonth 转换为索引（从 0 开始）private static int getMonthIndex(String yearMonth) {int year = Integer.parseInt(yearMonth.substring(0, 4));int month = Integer.parseInt(yearMonth.substring(5));return (year - 2024) * 12 + (month - 1); // 假设最小年份是 2024}public static void main(String[] args) {List<PriceData> data = PriceData.getSampleData();String title = "价格走势图";String subtitle = "2024-06 至 2025-01";String svg = SvgUtils.generatePriceTrendSvg(data, title, subtitle);System.out.println(svg);}
}

@Data
public class PriceData {private String yearmonth;private Double price;public PriceData() {}public PriceData(String yearmonth, Double price) {this.yearmonth = yearmonth;this.price = price;}public static List<PriceData> getSampleData() {List<PriceData> data = new ArrayList<>();data.add(new PriceData("2025-01", 100.0)); // 2023-01-01data.add(new PriceData("2025-02", 105.0)); // 2023-01-02data.add(new PriceData("2025-03", 102.0)); // 2023-01-03data.add(new PriceData("2025-04", 110.0)); // 2023-01-04data.add(new PriceData("2025-05", 108.0)); // 2023-01-05return data;}
}

OK, 生成的SVG嵌入到html网页中进行渲染即可