From 89075d22d8a748462a6d040f908976d5ea335b6b Mon Sep 17 00:00:00 2001
From: stockiNail <stocki.nail@gmail.com>
Date: Sat, 17 Sep 2022 15:31:09 +0200
Subject: [PATCH 1/6] Add overflow option to labels configuration

---
 src/element.js | 61 +++++++++++++++++++++++++++++++++++++++++---------
 1 file changed, 50 insertions(+), 11 deletions(-)

diff --git a/src/element.js b/src/element.js
index df26557..82b5efb 100644
--- a/src/element.js
+++ b/src/element.js
@@ -1,6 +1,8 @@
 import {Element} from 'chart.js';
 import {toFont, isArray, isObject} from 'chart.js/helpers';
 
+const widthCache = new Map();
+
 /**
  * Helper function to get the bounds of the rect
  * @param {TreemapElement} rect the rect
@@ -114,23 +116,59 @@ function drawCaption(ctx, rect, item) {
   ctx.fillText(captionsOpts.formatter || item.g, x, rect.y + padding + spacing + (font.lineHeight / 2));
 }
 
+function measureLabelSize(ctx, lines, font) {
+  const mapKey = lines.join() + font.string + (ctx._measureText ? '-spriting' : '');
+  if (!widthCache.has(mapKey)) {
+    ctx.save();
+    ctx.font = font.string;
+    const count = lines.length;
+    let width = 0;
+    for (let i = 0; i < count; i++) {
+      const text = lines[i];
+      width = Math.max(width, ctx.measureText(text).width);
+    }
+    ctx.restore();
+    const height = count * font.lineHeight;
+    widthCache.set(mapKey, {width, height});
+  }
+  return widthCache.get(mapKey);
+}
+
+function labelToDraw(ctx, rect, options, {labels, font}) {
+  const overflow = options.overflow;
+  if (overflow === 'hidden') {
+    const padding = options.padding;
+    const labelSize = measureLabelSize(ctx, labels, font);
+    if ((labelSize.width + padding) > rect.width || (labelSize.height + padding) > rect.height) {
+      return false;
+    }
+  } else if (overflow === 'visible') {
+    ctx.restore();
+  }
+  return true;
+}
+
 function drawLabel(ctx, rect) {
   const opts = rect.options;
   const labelsOpts = opts.labels;
-  const optColor = (rect.active ? labelsOpts.hoverColor : labelsOpts.color) || labelsOpts.color;
+  const label = labelsOpts.formatter;
+  if (!label) {
+    return;
+  }
+  const labels = isArray(label) ? label : [label];
   const optFont = (rect.active ? labelsOpts.hoverFont : labelsOpts.font) || labelsOpts.font;
   const font = toFont(optFont);
-  const lh = font.lineHeight;
-  const label = labelsOpts.formatter;
-  if (label) {
-    const labels = isArray(label) ? label : [label];
-    const xyPoint = calculateXYLabel(opts, rect, labels, lh);
-    ctx.font = font.string;
-    ctx.textAlign = labelsOpts.align;
-    ctx.textBaseline = labelsOpts.position;
-    ctx.fillStyle = optColor;
-    labels.forEach((l, i) => ctx.fillText(l, xyPoint.x, xyPoint.y + i * lh));
+  if (!labelToDraw(ctx, rect, labelsOpts, {labels, font})) {
+    return;
   }
+  const optColor = (rect.active ? labelsOpts.hoverColor : labelsOpts.color) || labelsOpts.color;
+  const lh = font.lineHeight;
+  const xyPoint = calculateXYLabel(opts, rect, labels, lh);
+  ctx.font = font.string;
+  ctx.textAlign = labelsOpts.align;
+  ctx.textBaseline = labelsOpts.position;
+  ctx.fillStyle = optColor;
+  labels.forEach((l, i) => ctx.fillText(l, xyPoint.x, xyPoint.y + i * lh));
 }
 
 function drawDivider(ctx, rect, item) {
@@ -286,6 +324,7 @@ TreemapElement.defaults = {
     display: false,
     formatter: (ctx) => ctx.raw.g ? [ctx.raw.g, ctx.raw.v] : ctx.raw.v,
     font: {},
+    overflow: 'clip',
     position: 'middle',
     padding: 3
   }

From f264c2af1d108b147ee462156f7eb6ecc6cccf34 Mon Sep 17 00:00:00 2001
From: stockiNail <stocki.nail@gmail.com>
Date: Sat, 17 Sep 2022 16:15:42 +0200
Subject: [PATCH 2/6] adds test cases

---
 src/element.js                                |   2 --
 .../basic/labelsMultilineOverflowCut.js       |  30 ++++++++++++++++++
 .../basic/labelsMultilineOverflowCut.png      | Bin 0 -> 10114 bytes
 .../basic/labelsMultilineOverflowHidden.js    |  30 ++++++++++++++++++
 .../basic/labelsMultilineOverflowHidden.png   | Bin 0 -> 8301 bytes
 test/fixtures/basic/labelsOverflowCut.js      |  30 ++++++++++++++++++
 test/fixtures/basic/labelsOverflowCut.png     | Bin 0 -> 11582 bytes
 test/fixtures/basic/labelsOverflowHidden.js   |  30 ++++++++++++++++++
 test/fixtures/basic/labelsOverflowHidden.png  | Bin 0 -> 5493 bytes
 9 files changed, 120 insertions(+), 2 deletions(-)
 create mode 100644 test/fixtures/basic/labelsMultilineOverflowCut.js
 create mode 100644 test/fixtures/basic/labelsMultilineOverflowCut.png
 create mode 100644 test/fixtures/basic/labelsMultilineOverflowHidden.js
 create mode 100644 test/fixtures/basic/labelsMultilineOverflowHidden.png
 create mode 100644 test/fixtures/basic/labelsOverflowCut.js
 create mode 100644 test/fixtures/basic/labelsOverflowCut.png
 create mode 100644 test/fixtures/basic/labelsOverflowHidden.js
 create mode 100644 test/fixtures/basic/labelsOverflowHidden.png

diff --git a/src/element.js b/src/element.js
index 82b5efb..5e2bc16 100644
--- a/src/element.js
+++ b/src/element.js
@@ -142,8 +142,6 @@ function labelToDraw(ctx, rect, options, {labels, font}) {
     if ((labelSize.width + padding) > rect.width || (labelSize.height + padding) > rect.height) {
       return false;
     }
-  } else if (overflow === 'visible') {
-    ctx.restore();
   }
   return true;
 }
diff --git a/test/fixtures/basic/labelsMultilineOverflowCut.js b/test/fixtures/basic/labelsMultilineOverflowCut.js
new file mode 100644
index 0000000..ac08c41
--- /dev/null
+++ b/test/fixtures/basic/labelsMultilineOverflowCut.js
@@ -0,0 +1,30 @@
+export default {
+  config: {
+    type: 'treemap',
+    data: {
+      datasets: [{
+        label: 'Simple treemap',
+        data: [6, 6, 4, 3, 2, 2, 1],
+        backgroundColor: 'red',
+        labels: {
+          display: true,
+          overflow: 'cut',
+          formatter: (ctx) => ('value is ' + ctx.raw.v + ',').repeat(8).split(',')
+        }
+      }]
+    },
+    options: {
+      layout: {
+        padding: {
+          bottom: 10
+        }
+      }
+    }
+  },
+  options: {
+    canvas: {
+      height: 256,
+      width: 512
+    }
+  }
+};
diff --git a/test/fixtures/basic/labelsMultilineOverflowCut.png b/test/fixtures/basic/labelsMultilineOverflowCut.png
new file mode 100644
index 0000000000000000000000000000000000000000..aa303bc97b343d2b6131b0d7e13ce8ae06169f30
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diff --git a/test/fixtures/basic/labelsMultilineOverflowHidden.js b/test/fixtures/basic/labelsMultilineOverflowHidden.js
new file mode 100644
index 0000000..b11f381
--- /dev/null
+++ b/test/fixtures/basic/labelsMultilineOverflowHidden.js
@@ -0,0 +1,30 @@
+export default {
+  config: {
+    type: 'treemap',
+    data: {
+      datasets: [{
+        label: 'Simple treemap',
+        data: [6, 6, 4, 3, 2, 2, 1],
+        backgroundColor: 'red',
+        labels: {
+          display: true,
+          overflow: 'hidden',
+          formatter: (ctx) => ('value is ' + ctx.raw.v + ',').repeat(6).split(',')
+        }
+      }]
+    },
+    options: {
+      layout: {
+        padding: {
+          bottom: 10
+        }
+      }
+    }
+  },
+  options: {
+    canvas: {
+      height: 256,
+      width: 512
+    }
+  }
+};
diff --git a/test/fixtures/basic/labelsMultilineOverflowHidden.png b/test/fixtures/basic/labelsMultilineOverflowHidden.png
new file mode 100644
index 0000000000000000000000000000000000000000..85f3b5a02892246f194ddd93975ebf270de3f360
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diff --git a/test/fixtures/basic/labelsOverflowCut.js b/test/fixtures/basic/labelsOverflowCut.js
new file mode 100644
index 0000000..8cb8542
--- /dev/null
+++ b/test/fixtures/basic/labelsOverflowCut.js
@@ -0,0 +1,30 @@
+export default {
+  config: {
+    type: 'treemap',
+    data: {
+      datasets: [{
+        label: 'Simple treemap',
+        data: [6, 6, 4, 3, 2, 2, 1],
+        backgroundColor: 'red',
+        labels: {
+          display: true,
+          overflow: 'cut',
+          formatter: (ctx) => ('value is ' + ctx.raw.v).repeat(5)
+        }
+      }]
+    },
+    options: {
+      layout: {
+        padding: {
+          bottom: 10
+        }
+      }
+    }
+  },
+  options: {
+    canvas: {
+      height: 256,
+      width: 512
+    }
+  }
+};
diff --git a/test/fixtures/basic/labelsOverflowCut.png b/test/fixtures/basic/labelsOverflowCut.png
new file mode 100644
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diff --git a/test/fixtures/basic/labelsOverflowHidden.js b/test/fixtures/basic/labelsOverflowHidden.js
new file mode 100644
index 0000000..354375c
--- /dev/null
+++ b/test/fixtures/basic/labelsOverflowHidden.js
@@ -0,0 +1,30 @@
+export default {
+  config: {
+    type: 'treemap',
+    data: {
+      datasets: [{
+        label: 'Simple treemap',
+        data: [6, 6, 4, 3, 2, 2, 1],
+        backgroundColor: 'red',
+        labels: {
+          display: true,
+          overflow: 'hidden',
+          formatter: (ctx) => ('value is ' + ctx.raw.v).repeat(5)
+        }
+      }]
+    },
+    options: {
+      layout: {
+        padding: {
+          bottom: 10
+        }
+      }
+    }
+  },
+  options: {
+    canvas: {
+      height: 256,
+      width: 512
+    }
+  }
+};
diff --git a/test/fixtures/basic/labelsOverflowHidden.png b/test/fixtures/basic/labelsOverflowHidden.png
new file mode 100644
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literal 0
HcmV?d00001


From 4df802564cb5cf378a5c62668fa5993a974579dc Mon Sep 17 00:00:00 2001
From: stockiNail <stocki.nail@gmail.com>
Date: Sat, 17 Sep 2022 16:21:10 +0200
Subject: [PATCH 3/6] adds types definition

---
 types/index.esm.d.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/types/index.esm.d.ts b/types/index.esm.d.ts
index 2976cf6..6ae775e 100644
--- a/types/index.esm.d.ts
+++ b/types/index.esm.d.ts
@@ -30,6 +30,7 @@ type TreemapControllerDatasetLabelsOptions = {
   font?: FontSpec,
   hoverColor?: Scriptable<Color, TreemapScriptableContext>,
   hoverFont?: FontSpec,
+  overflow?: Scriptable<LabelOverflow, TreemapScriptableContext>
   padding?: number,
   position?: Scriptable<LabelPosition, TreemapScriptableContext>
 }
@@ -38,6 +39,8 @@ export type LabelPosition = 'top' | 'middle' | 'bottom';
 
 export type LabelAlign = 'left' | 'center' | 'right';
 
+export type LabelOverflow = 'cut' | 'hidden';
+
 type TreemapControllerDatasetDividersOptions = {
   display?: boolean,
   lineCapStyle?: string,

From 4909a0a74f69600bc02e23b03092e506d8af57a6 Mon Sep 17 00:00:00 2001
From: stockiNail <stocki.nail@gmail.com>
Date: Sat, 17 Sep 2022 16:37:16 +0200
Subject: [PATCH 4/6] adds docs and samples

---
 docs/samples/captions.md | 17 +++++++++++++++++
 docs/usage.md            | 12 ++++++++++--
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/docs/samples/captions.md b/docs/samples/captions.md
index 50d355a..f28db5e 100644
--- a/docs/samples/captions.md
+++ b/docs/samples/captions.md
@@ -63,14 +63,31 @@ const config = {
           weight: 'bold'
         },
         padding: 5
+      },
+      labels: {
+        display: false,
+        overflow: 'hidden'
       }
     }]
   },
   options: options
 };
 // </block:config>
+function toggle(chart) {
+  const labels = chart.data.datasets[0].labels;
+  labels.display = !labels.display;
+  chart.update();
+}
+
+const actions = [
+  {
+    name: 'Toggle labels',
+    handler: (chart) => toggle(chart, 'region')
+  }
+];
 
 module.exports = {
   config,
+  actions
 };
 ```
diff --git a/docs/usage.md b/docs/usage.md
index 3404b11..8dadf93 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -193,9 +193,10 @@ The labels options can control if and how a label, to represent the data, can be
 | `color` | [`Color`](https://www.chartjs.org/docs/latest/general/colors.html) | Yes | `undefined`
 | `display` | `boolean` | - | `false`
 | [`formatter`](#formatter) | `function` | Yes | 
-| [`font`](https://www.chartjs.org/docs/latest/general/fonts.html) | `Font` | Yes | `{}` 
+| [`font`](https://www.chartjs.org/docs/latest/general/fonts.html) | `Font` | Yes | `{}`
 | `hoverColor` | [`Color`](https://www.chartjs.org/docs/latest/general/colors.html) | Yes | `undefined`
-| [`hoverFont`](https://www.chartjs.org/docs/latest/general/fonts.html) | `Font` | Yes | `{}` 
+| [`hoverFont`](https://www.chartjs.org/docs/latest/general/fonts.html) | `Font` | Yes | `{}`
+| [`overflow`](#overflow) | `string` | Yes | `cut`
 | `padding` | `number` | - | `3` 
 | [`position`](#position) | `string` | Yes | `middle`
 
@@ -215,6 +216,13 @@ The align property specifies the text horizontal alignment used when drawing the
 * `left`: the text is left-aligned.
 * `right`: the text is right-aligned.
 
+### Overflow
+
+The overflow property controls what happens to a label that is too big to fit into a rectangle. The possible values are:
+
+* `cut`: if the label is too big, it will be cut to stay inside the rectangle. It is the default.
+* `hidden`:  the label is removed altogether if the rectangle is too small for it.
+
 ### Position
 
 The position property specifies the text vertical alignment used when drawing the label. The possible values are:

From 77f12ba41aca0160e70d5a2f61b89f13c6fa0dcd Mon Sep 17 00:00:00 2001
From: stockiNail <stocki.nail@gmail.com>
Date: Sat, 17 Sep 2022 21:44:20 +0200
Subject: [PATCH 5/6] improves check if overflow is hidden

---
 src/element.js                                |   4 +---
 .../basic/labelsMultilineOverflowHidden.png   | Bin 8301 -> 7490 bytes
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/src/element.js b/src/element.js
index 5e2bc16..22428a9 100644
--- a/src/element.js
+++ b/src/element.js
@@ -139,9 +139,7 @@ function labelToDraw(ctx, rect, options, {labels, font}) {
   if (overflow === 'hidden') {
     const padding = options.padding;
     const labelSize = measureLabelSize(ctx, labels, font);
-    if ((labelSize.width + padding) > rect.width || (labelSize.height + padding) > rect.height) {
-      return false;
-    }
+    return !((labelSize.width + padding * 2) > rect.width || (labelSize.height + padding * 2) > rect.height);
   }
   return true;
 }
diff --git a/test/fixtures/basic/labelsMultilineOverflowHidden.png b/test/fixtures/basic/labelsMultilineOverflowHidden.png
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From 2ef0b68b1c2a962becfc937e650373dc0a9ea785 Mon Sep 17 00:00:00 2001
From: stockiNail <stocki.nail@gmail.com>
Date: Mon, 19 Sep 2022 10:03:37 +0200
Subject: [PATCH 6/6] apply review

---
 docs/samples/captions.md | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/docs/samples/captions.md b/docs/samples/captions.md
index f28db5e..afd205b 100644
--- a/docs/samples/captions.md
+++ b/docs/samples/captions.md
@@ -73,16 +73,15 @@ const config = {
   options: options
 };
 // </block:config>
-function toggle(chart) {
-  const labels = chart.data.datasets[0].labels;
-  labels.display = !labels.display;
-  chart.update();
-}
 
 const actions = [
   {
     name: 'Toggle labels',
-    handler: (chart) => toggle(chart, 'region')
+    handler(chart) {
+      const labels = chart.data.datasets[0].labels;
+      labels.display = !labels.display;
+      chart.update();
+    }
   }
 ];