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// Chart Render API – Java example (Java 15+)

// Usage: CHARTQUERY_API_KEY=your-key java ChartExample.java

import java.net.URI;

import java.net.URLEncoder;

import java.net.http.HttpClient;

import java.net.http.HttpRequest;

import java.net.http.HttpResponse;

import java.nio.charset.StandardCharsets;

import java.nio.file.Files;

import java.nio.file.Path;

import java.time.Duration;

import java.util.Set;

import java.util.regex.Matcher;

import java.util.regex.Pattern;

public class ChartExample {

static final HttpClient CLIENT = HttpClient.newHttpClient();

static final String KEY = System.getenv("CHARTQUERY_API_KEY");

static String enc(String v) {

return URLEncoder.encode(v, StandardCharsets.UTF_8);

}

static HttpResponse<byte[]> call(String method, String url, String body) throws Exception {

HttpRequest.Builder b = HttpRequest.newBuilder().uri(URI.create(url)).header("x-api-key", KEY)

.timeout(Duration.ofSeconds(120));

b = body == null ? b.method(method, HttpRequest.BodyPublishers.noBody())

: b.header("Content-Type", "application/json").method(method, HttpRequest.BodyPublishers.ofString(body));

HttpResponse<byte[]> r = CLIENT.send(b.build(), HttpResponse.BodyHandlers.ofByteArray());

if (r.statusCode() >= 400) {

System.err.println("HTTP " + r.statusCode() + ": " + new String(r.body(), StandardCharsets.UTF_8));

System.exit(1);

}

return r;

}

static String field(String json, String name) {

Matcher m = Pattern.compile("\"" + name + "\"\\s*:\\s*\"([^\"]*)\"").matcher(json);

return m.find() ? m.group(1) : "";

}

public static void main(String[] args) throws Exception {

String query = "query=" + enc("{\"type\":\"bar\",\"title\":\"Monthly Sales\",\"legend\":\"bottom\",\"width\":1200,\"height\":600,\"device_pixel_ratio\":1,\"data\":{\"labels\":[\"Jan\",\"Feb\",\"Mar\",\"Apr\",\"May\",\"Jun\"],\"datasets\":[{\"label\":\"2025\",\"data\":[42,58,37,65,49,72],\"backgroundColor\":\"rgba(99,102,241,0.85)\"},{\"label\":\"2026\",\"data\":[51,67,44,71,58,85],\"backgroundColor\":\"rgba(249,115,22,0.85)\"}]},\"scales\":{\"y\":{\"beginAtZero\":true}}}");

HttpResponse<byte[]> response = call("GET", "https://api.chartquery.com/v1/chart" + (query.isEmpty() ? "" : "?" + query), null);

Files.write(Path.of("chart.png"), response.body());

System.out.println("Saved chart.png");

}