From 2cbcd8892f538b1dbcb6dadeae4b2a47af33d84c Mon Sep 17 00:00:00 2001
From: Jukka Kurkela <jukka.kurkela@gmail.com>
Date: Fri, 17 Jul 2020 20:29:43 +0300
Subject: [PATCH] minBarLength at base going both ways (#7642)

---
 src/controllers/controller.bar.js             |   5 ++-
 .../minBarLength/horizontal-neg.js            |  35 ++++++++++++++++++
 .../minBarLength/horizontal-neg.png           | Bin 0 -> 10242 bytes
 .../minBarLength/horizontal-pos.js            |  35 ++++++++++++++++++
 .../minBarLength/horizontal-pos.png           | Bin 0 -> 9922 bytes
 .../controller.bar/minBarLength/horizontal.js |  35 ++++++++++++++++++
 .../minBarLength/horizontal.png               | Bin 0 -> 11022 bytes
 .../minBarLength/vertical-neg.js              |  34 +++++++++++++++++
 .../minBarLength/vertical-neg.png             | Bin 0 -> 9031 bytes
 .../minBarLength/vertical-pos.js              |  34 +++++++++++++++++
 .../minBarLength/vertical-pos.png             | Bin 0 -> 8979 bytes
 .../controller.bar/minBarLength/vertical.js   |  34 +++++++++++++++++
 .../controller.bar/minBarLength/vertical.png  | Bin 0 -> 9015 bytes
 13 files changed, 211 insertions(+), 1 deletion(-)
 create mode 100644 test/fixtures/controller.bar/minBarLength/horizontal-neg.js
 create mode 100644 test/fixtures/controller.bar/minBarLength/horizontal-neg.png
 create mode 100644 test/fixtures/controller.bar/minBarLength/horizontal-pos.js
 create mode 100644 test/fixtures/controller.bar/minBarLength/horizontal-pos.png
 create mode 100644 test/fixtures/controller.bar/minBarLength/horizontal.js
 create mode 100644 test/fixtures/controller.bar/minBarLength/horizontal.png
 create mode 100644 test/fixtures/controller.bar/minBarLength/vertical-neg.js
 create mode 100644 test/fixtures/controller.bar/minBarLength/vertical-neg.png
 create mode 100644 test/fixtures/controller.bar/minBarLength/vertical-pos.js
 create mode 100644 test/fixtures/controller.bar/minBarLength/vertical-pos.png
 create mode 100644 test/fixtures/controller.bar/minBarLength/vertical.js
 create mode 100644 test/fixtures/controller.bar/minBarLength/vertical.png

diff --git a/src/controllers/controller.bar.js b/src/controllers/controller.bar.js
index c2ce35d8c..32769d59b 100644
--- a/src/controllers/controller.bar.js
+++ b/src/controllers/controller.bar.js
@@ -409,7 +409,7 @@ export default class BarController extends DatasetController {
 		// So we don't try to draw so huge rectangles.
 		// https://github.com/chartjs/Chart.js/issues/5247
 		// TODO: use borderWidth instead (need to move the parsing from rectangle)
-		const base = _limitValue(vScale.getPixelForValue(start),
+		let base = _limitValue(vScale.getPixelForValue(start),
 			vScale._startPixel - 10,
 			vScale._endPixel + 10);
 
@@ -418,6 +418,9 @@ export default class BarController extends DatasetController {
 
 		if (minBarLength !== undefined && Math.abs(size) < minBarLength) {
 			size = size < 0 ? -minBarLength : minBarLength;
+			if (value === 0) {
+				base -= size / 2;
+			}
 			head = base + size;
 		}
 
diff --git a/test/fixtures/controller.bar/minBarLength/horizontal-neg.js b/test/fixtures/controller.bar/minBarLength/horizontal-neg.js
new file mode 100644
index 000000000..8cfba0f0d
--- /dev/null
+++ b/test/fixtures/controller.bar/minBarLength/horizontal-neg.js
@@ -0,0 +1,35 @@
+module.exports = {
+	config: {
+		type: 'bar',
+		data: {
+			labels: [0, 1, 2],
+			datasets: [
+				{
+					data: [0, -0.01, -30],
+					backgroundColor: '#00ff00',
+					borderWidth: 0,
+					minBarLength: 20
+				}
+			]
+		},
+		options: {
+			legend: false,
+			title: false,
+			indexAxis: 'y',
+			scales: {
+				x: {
+					ticks: {
+						display: false
+					}
+				},
+				y: {display: false}
+			}
+		}
+	},
+	options: {
+		canvas: {
+			height: 512,
+			width: 512
+		}
+	}
+};
diff --git a/test/fixtures/controller.bar/minBarLength/horizontal-neg.png b/test/fixtures/controller.bar/minBarLength/horizontal-neg.png
new file mode 100644
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diff --git a/test/fixtures/controller.bar/minBarLength/horizontal-pos.js b/test/fixtures/controller.bar/minBarLength/horizontal-pos.js
new file mode 100644
index 000000000..c5f964955
--- /dev/null
+++ b/test/fixtures/controller.bar/minBarLength/horizontal-pos.js
@@ -0,0 +1,35 @@
+module.exports = {
+	config: {
+		type: 'bar',
+		data: {
+			labels: [0, 1, 2],
+			datasets: [
+				{
+					data: [0, 0.01, 30],
+					backgroundColor: '#00ff00',
+					borderWidth: 0,
+					minBarLength: 20
+				}
+			]
+		},
+		options: {
+			legend: false,
+			title: false,
+			indexAxis: 'y',
+			scales: {
+				x: {
+					ticks: {
+						display: false
+					}
+				},
+				y: {display: false}
+			}
+		}
+	},
+	options: {
+		canvas: {
+			height: 512,
+			width: 512
+		}
+	}
+};
diff --git a/test/fixtures/controller.bar/minBarLength/horizontal-pos.png b/test/fixtures/controller.bar/minBarLength/horizontal-pos.png
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diff --git a/test/fixtures/controller.bar/minBarLength/horizontal.js b/test/fixtures/controller.bar/minBarLength/horizontal.js
new file mode 100644
index 000000000..789b484c4
--- /dev/null
+++ b/test/fixtures/controller.bar/minBarLength/horizontal.js
@@ -0,0 +1,35 @@
+module.exports = {
+	config: {
+		type: 'bar',
+		data: {
+			labels: [0, 1, 2, 3, 4],
+			datasets: [
+				{
+					data: [0, -0.01, 0.01, 30, -30],
+					backgroundColor: '#00ff00',
+					borderWidth: 0,
+					minBarLength: 20
+				}
+			]
+		},
+		options: {
+			legend: false,
+			title: false,
+			indexAxis: 'y',
+			scales: {
+				x: {
+					ticks: {
+						display: false
+					}
+				},
+				y: {display: false}
+			}
+		}
+	},
+	options: {
+		canvas: {
+			height: 512,
+			width: 512
+		}
+	}
+};
diff --git a/test/fixtures/controller.bar/minBarLength/horizontal.png b/test/fixtures/controller.bar/minBarLength/horizontal.png
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diff --git a/test/fixtures/controller.bar/minBarLength/vertical-neg.js b/test/fixtures/controller.bar/minBarLength/vertical-neg.js
new file mode 100644
index 000000000..f5976b5ac
--- /dev/null
+++ b/test/fixtures/controller.bar/minBarLength/vertical-neg.js
@@ -0,0 +1,34 @@
+module.exports = {
+	config: {
+		type: 'bar',
+		data: {
+			labels: [0, 1, 2],
+			datasets: [
+				{
+					data: [0, -0.01, -30],
+					backgroundColor: '#00ff00',
+					borderWidth: 0,
+					minBarLength: 20
+				}
+			]
+		},
+		options: {
+			legend: false,
+			title: false,
+			scales: {
+				x: {display: false},
+				y: {
+					ticks: {
+						display: false
+					}
+				}
+			}
+		}
+	},
+	options: {
+		canvas: {
+			height: 512,
+			width: 512
+		}
+	}
+};
diff --git a/test/fixtures/controller.bar/minBarLength/vertical-neg.png b/test/fixtures/controller.bar/minBarLength/vertical-neg.png
new file mode 100644
index 0000000000000000000000000000000000000000..ec9636feb5f709b3ff09e4fb777de4f8a3cc2e39
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diff --git a/test/fixtures/controller.bar/minBarLength/vertical-pos.js b/test/fixtures/controller.bar/minBarLength/vertical-pos.js
new file mode 100644
index 000000000..7d69b2920
--- /dev/null
+++ b/test/fixtures/controller.bar/minBarLength/vertical-pos.js
@@ -0,0 +1,34 @@
+module.exports = {
+	config: {
+		type: 'bar',
+		data: {
+			labels: [0, 1, 2],
+			datasets: [
+				{
+					data: [0, 0.01, 30],
+					backgroundColor: '#00ff00',
+					borderWidth: 0,
+					minBarLength: 20
+				}
+			]
+		},
+		options: {
+			legend: false,
+			title: false,
+			scales: {
+				x: {display: false},
+				y: {
+					ticks: {
+						display: false
+					}
+				}
+			}
+		}
+	},
+	options: {
+		canvas: {
+			height: 512,
+			width: 512
+		}
+	}
+};
diff --git a/test/fixtures/controller.bar/minBarLength/vertical-pos.png b/test/fixtures/controller.bar/minBarLength/vertical-pos.png
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diff --git a/test/fixtures/controller.bar/minBarLength/vertical.js b/test/fixtures/controller.bar/minBarLength/vertical.js
new file mode 100644
index 000000000..29da8a6e1
--- /dev/null
+++ b/test/fixtures/controller.bar/minBarLength/vertical.js
@@ -0,0 +1,34 @@
+module.exports = {
+	config: {
+		type: 'bar',
+		data: {
+			labels: [0, 1, 2, 3, 4],
+			datasets: [
+				{
+					data: [0, -0.01, 0.01, 30, -30],
+					backgroundColor: '#00ff00',
+					borderWidth: 0,
+					minBarLength: 20
+				}
+			]
+		},
+		options: {
+			legend: false,
+			title: false,
+			scales: {
+				x: {display: false},
+				y: {
+					ticks: {
+						display: false
+					}
+				}
+			}
+		}
+	},
+	options: {
+		canvas: {
+			height: 512,
+			width: 512
+		}
+	}
+};
diff --git a/test/fixtures/controller.bar/minBarLength/vertical.png b/test/fixtures/controller.bar/minBarLength/vertical.png
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