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diff --git a/web-timeplot/src/waterfall.js b/web-timeplot/src/waterfall.js
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+++ b/web-timeplot/src/waterfall.js
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+import { Container, Graphics, Text } from 'pixi.js';
+
+/**
+ * WaterfallGraph - A scrolling waterfall display
+ * Starts simple with basic line rendering
+ */
+export class WaterfallGraph {
+    constructor(config) {
+        this.x = config.x;
+        this.y = config.y;
+        this.width = config.width;
+        this.height = config.height;
+        this.title = config.title;
+        this.baseColor = config.color || 0xff6666;
+
+        this.container = new Container();
+        this.container.x = this.x;
+        this.container.y = this.y;
+
+        // Graphics layers
+        this.borderGraphics = new Graphics();
+        this.gridGraphics = new Graphics();
+        this.linesGraphics = new Graphics();
+
+        this.container.addChild(this.gridGraphics);
+        this.container.addChild(this.linesGraphics);
+        this.container.addChild(this.borderGraphics);
+
+        // Title text
+        this.titleText = new Text({
+            text: this.title,
+            style: {
+                fontFamily: 'Arial',
+                fontSize: 18,
+                fill: 0xeeeeee,
+            }
+        });
+        this.titleText.x = 10;
+        this.titleText.y = 10;
+        this.container.addChild(this.titleText);
+
+        // Waterfall data
+        this.lines = [];
+        this.maxLines = 50;
+        this.pointsPerLine = 100;
+        this.frameCounter = 0;
+
+        this.showGrid = true;
+
+        // Time scaling and zoom
+        this.scrollSpeed = 1.0; // Speed multiplier for scrolling
+        this.baseScrollSpeed = 1.0;
+        this.verticalScale = 1.0; // Vertical zoom: >1 = zoomed in (see less history), <1 = zoomed out (see more)
+
+        this.draw();
+    }
+
+    draw() {
+        this.drawBorder();
+        this.drawGrid();
+    }
+
+    drawBorder() {
+        this.borderGraphics.clear();
+        this.borderGraphics.rect(0, 0, this.width, this.height);
+        this.borderGraphics.stroke({ width: 2, color: 0x606070 });
+    }
+
+    drawGrid() {
+        this.gridGraphics.clear();
+
+        if (!this.showGrid) return;
+
+        this.gridGraphics.alpha = 0.3;
+
+        const divisions = 10;
+        const color = 0x4a7a9a;
+
+        // Vertical lines
+        for (let i = 0; i <= divisions; i++) {
+            const x = (i / divisions) * this.width;
+            this.gridGraphics.moveTo(x, 0);
+            this.gridGraphics.lineTo(x, this.height);
+            this.gridGraphics.stroke({ width: 1, color });
+        }
+
+        // Horizontal lines
+        for (let i = 0; i <= divisions; i++) {
+            const y = (i / divisions) * this.height;
+            this.gridGraphics.moveTo(0, y);
+            this.gridGraphics.lineTo(this.width, y);
+            this.gridGraphics.stroke({ width: 1, color });
+        }
+    }
+
+    update(time, graphIdx) {
+        this.frameCounter++;
+
+        // Add new line every 10 frames
+        if (this.frameCounter % 10 === 0 && this.lines.length < this.maxLines) {
+            this.addLine(time, graphIdx);
+        }
+
+        // Scroll existing lines down
+        this.scrollLines();
+
+        // Remove off-screen lines
+        this.lines = this.lines.filter(line => line.yOffset < this.height + 50);
+
+        // Redraw all lines
+        this.drawLines();
+    }
+
+    addLine(time, graphIdx) {
+        const line = {
+            points: [],
+            yOffset: 0,
+            color: this.generateColor(time),
+        };
+
+        // Generate sine wave points
+        const phase = time + (graphIdx * 2);
+        const freq = 2.0 + Math.sin(time * 0.5 + graphIdx) * 1.0;
+
+        for (let i = 0; i < this.pointsPerLine; i++) {
+            const x = (i / this.pointsPerLine) * this.width;
+            const normalizedX = (i / this.pointsPerLine) * 2 - 1; // -1 to 1
+            const y = Math.sin(i * 0.1 * freq + phase) * 30; // Amplitude in pixels
+
+            line.points.push({ x, y });
+        }
+
+        this.lines.push(line);
+    }
+
+    scrollLines() {
+        const speed = this.baseScrollSpeed * this.scrollSpeed;
+        this.lines.forEach(line => {
+            line.yOffset += speed;
+        });
+    }
+
+    setScrollSpeed(speed) {
+        // Clamp between 0.1 (slow) and 5.0 (fast)
+        this.scrollSpeed = Math.max(0.1, Math.min(5.0, speed));
+    }
+
+    getScrollSpeed() {
+        return this.scrollSpeed;
+    }
+
+    setVerticalScale(scale) {
+        // Clamp between 0.2 (zoomed out, see more history) and 3.0 (zoomed in, see less)
+        this.verticalScale = Math.max(0.2, Math.min(3.0, scale));
+    }
+
+    getVerticalScale() {
+        return this.verticalScale;
+    }
+
+    drawLines() {
+        this.linesGraphics.clear();
+
+        for (const line of this.lines) {
+            if (line.points.length < 2) continue;
+
+            // Apply vertical scale to y positions
+            // Current time is at top (y=0), older data has larger yOffset
+            const scaledYOffset = line.yOffset * this.verticalScale;
+
+            // Start path
+            const firstPoint = line.points[0];
+            this.linesGraphics.moveTo(firstPoint.x, firstPoint.y + scaledYOffset);
+
+            // Draw line strip
+            for (let i = 1; i < line.points.length; i++) {
+                const point = line.points[i];
+                this.linesGraphics.lineTo(point.x, point.y + scaledYOffset);
+            }
+
+            this.linesGraphics.stroke({ width: 2, color: line.color });
+        }
+    }
+
+    generateColor(time) {
+        // Cycle through colors based on time
+        const hue = (time * 0.1) % 1.0;
+        const r = Math.floor(Math.abs(Math.sin(hue * Math.PI * 2)) * 255);
+        const g = Math.floor(Math.abs(Math.sin((hue + 0.33) * Math.PI * 2)) * 255);
+        const b = Math.floor(Math.abs(Math.sin((hue + 0.66) * Math.PI * 2)) * 255);
+
+        return (r << 16) | (g << 8) | b;
+    }
+
+    setGridVisible(visible) {
+        this.showGrid = visible;
+        this.drawGrid();
+    }
+
+    resize(x, y, width, height) {
+        this.x = x;
+        this.y = y;
+        this.width = width;
+        this.height = height;
+
+        this.container.x = x;
+        this.container.y = y;
+
+        this.draw();
+    }
+
+    getVertexCount() {
+        return this.lines.reduce((sum, line) => sum + line.points.length, 0);
+    }
+
+    getLineCount() {
+        return this.lines.length;
+    }
+}