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feat: add Fit to Screen zoom control utility #36

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feat: add Fit to Screen zoom control utility #36

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46 changes: 46 additions & 0 deletions src/components/CenterCanvas.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -99,6 +99,45 @@ export default function CenterCanvas({
setIsPanning(false);
};

const handleFitToScreen = () => {
if (nodes.length === 0 || !containerRef.current) return;

let minX = Infinity;
let maxX = -Infinity;
let minY = Infinity;
let maxY = -Infinity;

nodes.forEach((node) => {
minX = Math.min(minX, node.x);
maxX = Math.max(maxX, node.x + NODE_WIDTH);
minY = Math.min(minY, node.y);
maxY = Math.max(maxY, node.y + NODE_HEIGHT);
});

const contentWidth = maxX - minX;
const contentHeight = maxY - minY;

const containerWidth = containerRef.current.clientWidth;
const containerHeight = containerRef.current.clientHeight;

const padding = 80;
const scaleX = (containerWidth - padding) / contentWidth;
const scaleY = (containerHeight - padding) / contentHeight;
let newScale = Math.min(scaleX, scaleY);
newScale = Math.min(Math.max(0.4, newScale), 2);

@cubic-dev-ai cubic-dev-ai Bot Jun 27, 2026

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P1: Fit-to-screen uses inconsistent zoom clamping range [0.4, 2] instead of the canvas-wide [0.25, 3], which can prevent large/small charts from actually fitting to the viewport.

Prompt for AI agents 
Check if this issue is valid — if so, understand the root cause and fix it. At src/components/CenterCanvas.tsx, line 127:

<comment>Fit-to-screen uses inconsistent zoom clamping range [0.4, 2] instead of the canvas-wide [0.25, 3], which can prevent large/small charts from actually fitting to the viewport.</comment>

<file context>
@@ -99,6 +99,45 @@ export default function CenterCanvas({
+    const scaleX = (containerWidth - padding) / contentWidth;
+    const scaleY = (containerHeight - padding) / contentHeight;
+    let newScale = Math.min(scaleX, scaleY);
+    newScale = Math.min(Math.max(0.4, newScale), 2);
+    newScale = parseFloat(newScale.toFixed(2));
+
</file context>
Suggested change
newScale = Math.min(Math.max(0.4, newScale), 2);
newScale = Math.min(Math.max(0.25, newScale), 3);

newScale = parseFloat(newScale.toFixed(2));

const contentCx = minX + contentWidth / 2;
const contentCy = minY + contentHeight / 2;

const newPanX = containerWidth / 2 - contentCx * newScale;
const newPanY = containerHeight / 2 - contentCy * newScale;

setScale(newScale);
setPan({ x: Math.round(newPanX), y: Math.round(newPanY) });
showToast?.('Fit flowchart to screen', 'info');
};

// Wheel zoom listener with passive ref to prevent page scroll
React.useEffect(() => {
const container = containerRef.current;
Expand Down Expand Up @@ -748,6 +787,13 @@ export default function CenterCanvas({
>
Reset
</button>
<button
onClick={handleFitToScreen}
title="Fit all blocks to viewport"
className="px-2.5 py-1.5 text-[11px] font-bold text-indigo-600 hover:text-indigo-700 hover:bg-indigo-50 border border-indigo-100 hover:border-indigo-200 rounded-lg transition-colors cursor-pointer"
>
Fit
</button>
</div>
</>
)}
Expand Down
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