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Include color legend in PNG exports. #4

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Include color legend in PNG exports. #4

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67 changes: 66 additions & 1 deletion call_flow_map.php
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Original file line number Diff line number Diff line change
Expand Up @@ -267,6 +267,9 @@
external: { color: { background: '#F5F5F5', border: '#616161' }, font: { color: '#424242' } },
};

// Color legend (same items as the web UI strip above the diagram)
var legend_items = <?php echo json_encode($legend); ?>;

var network = null;

// Populate destination dropdown when type changes
Expand Down Expand Up @@ -413,9 +416,42 @@ function dodownload_png(with_background) {
var src = document.querySelector('#diagram-container canvas');
if (!src) return;

// Scale legend to match canvas resolution (retina / DPR)
var scale = (src.clientWidth > 0) ? (src.width / src.clientWidth) : 1;
var pad = Math.round(16 * scale);
var box = Math.round(14 * scale);
var gapX = Math.round(18 * scale);
var gapY = Math.round(10 * scale);
var fontSize = Math.round(12 * scale);
var radius = Math.round(3 * scale);
var labelGap = Math.round(6 * scale);

var measure = document.createElement('canvas').getContext('2d');
measure.font = fontSize + 'px sans-serif';

var maxWidth = src.width - pad * 2;
var rows = [];
var row = [];
var rowWidth = 0;
legend_items.forEach(function(item) {
var itemW = box + labelGap + measure.measureText(item.label).width;
if (row.length && rowWidth + gapX + itemW > maxWidth) {
rows.push(row);
row = [];
rowWidth = 0;
}
if (row.length) rowWidth += gapX;
row.push({ item: item, width: itemW });
rowWidth += itemW;
});
if (row.length) rows.push(row);

var rowH = box + gapY;
var legendH = pad + rows.length * rowH + pad;

var canvas = document.createElement('canvas');
canvas.width = src.width;
canvas.height = src.height;
canvas.height = src.height + legendH;
var ctx = canvas.getContext('2d');

if (with_background) {
Expand All @@ -424,6 +460,35 @@ function dodownload_png(with_background) {
}
ctx.drawImage(src, 0, 0);

// Legend strip under the diagram
ctx.font = fontSize + 'px sans-serif';
ctx.textBaseline = 'middle';
ctx.lineWidth = Math.max(1, Math.round(scale));

var y = src.height + pad;
rows.forEach(function(r) {
var x = pad;
r.forEach(function(entry) {
var item = entry.item;
ctx.beginPath();
if (ctx.roundRect) {
ctx.roundRect(x, y, box, box, radius);
}
else {
ctx.rect(x, y, box, box);
}
ctx.fillStyle = item.bg;
ctx.fill();
ctx.strokeStyle = item.border;
ctx.stroke();

ctx.fillStyle = '#333333';
ctx.fillText(item.label, x + box + labelGap, y + box / 2);
x += entry.width + gapX;
});
y += rowH;
});

var link = document.createElement('a');
link.download = 'call_flow_map.png';
link.href = canvas.toDataURL('image/png');
Expand Down