candlestick-chart-generator/examples/test_canvas.js

A Node.js library for generating candlestick chart screenshots using financial data

const CandlestickChartGeneratorCanvas = require('../index_canvas');

async function testCanvasCharts() {
    const generator = new CandlestickChartGeneratorCanvas();

    try {
        console.log('=== Testing Canvas-based Candlestick Chart Generator ===\n');

        // Test 1: AAPL Daily Chart
        console.log('1. Generating AAPL daily chart with Canvas...');
        await generator.generateChartScreenshot({
            symbol: 'AAPL',
            interval: '1d',
            startDate: '2023-01-01',
            endDate: '2023-12-31',
            outputPath: 'examples/aapl_daily_canvas.png',
            width: 1000,
            height: 500
        });
        console.log('✅ AAPL daily chart saved to examples/aapl_daily_canvas.png\n');

        // Test 2: BTC-USD Hourly Chart
        console.log('2. Generating BTC-USD hourly chart with Canvas...');
        const oneWeekAgo = new Date(Date.now() - 7 * 24 * 60 * 60 * 1000);
        await generator.generateChartScreenshot({
            symbol: 'BTC-USD',
            interval: '1h',
            startDate: oneWeekAgo,
            endDate: new Date(),
            outputPath: 'examples/btc_hourly_canvas.png',
            width: 1200,
            height: 600
        });
        console.log('✅ BTC-USD hourly chart saved to examples/btc_hourly_canvas.png\n');

        // Test 3: EURUSD 1-minute Chart
        console.log('3. Generating EURUSD 1-minute chart with Canvas...');
        const oneDayAgo = new Date(Date.now() - 24 * 60 * 60 * 1000);
        await generator.generateChartScreenshot({
            symbol: 'EURUSD=X',
            interval: '1m',
            startDate: oneDayAgo,
            endDate: new Date(),
            outputPath: 'examples/eurusd_1m_canvas.png',
            width: 1200,
            height: 600
        });
        console.log('✅ EURUSD 1-minute chart saved to examples/eurusd_1m_canvas.png\n');

        // Test 4: Generate chart as base64 data
        console.log('4. Generating chart as base64 data with Canvas...');
        const base64Data = await generator.generateChartBase64({
            symbol: 'TSLA',
            interval: '1d',
            startDate: '2023-06-01',
            endDate: '2023-12-31',
            width: 800,
            height: 400
        });
        console.log(`✅ TSLA chart generated as base64 (${base64Data.length} characters)\n`);

        console.log('🎉 All Canvas chart tests completed successfully!');

    } catch (error) {
        console.error('❌ Error:', error.message);
        console.error('Stack trace:', error.stack);
    } finally {
        // Clean up
        await generator.close();
    }
}

// Run the tests
testCanvasCharts();