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Add rotate angle to chart #124

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merged 8 commits into from
Dec 11, 2019
Merged

Add rotate angle to chart #124

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6473149
add rotate angel to chart
arefhosseini Dec 4, 2019
5fc82ab
restore test params
arefhosseini Dec 4, 2019
6bc6eab
add rotate angle to lerp function
arefhosseini Dec 5, 2019
3446f5f
fix bug of position text when rotating
arefhosseini Dec 5, 2019
41b8772
fix bug of position text when rotating
arefhosseini Dec 5, 2019
572571c
fix center rotating & translate of side titles
arefhosseini Dec 8, 2019
f5e3df0
add rotateAngle & SideTitlesAlignment to doc
arefhosseini Dec 11, 2019
b8cdaec
remove SideTitlesAlignment
arefhosseini Dec 11, 2019
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16 changes: 16 additions & 0 deletions example/lib/bar_chart/samples/bar_chart_sample5.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -41,6 +41,7 @@ class BarChartSample5State extends State<BarChartSample5> {
showTitles: true,
textStyle: TextStyle(color: Colors.white, fontSize: 10),
margin: 10,
rotateAngle: 180,
getTitles: (double value) {
switch (value.toInt()) {
case 0:
Expand All @@ -65,6 +66,21 @@ class BarChartSample5State extends State<BarChartSample5> {
leftTitles: SideTitles(
showTitles: true,
textStyle: TextStyle(color: Colors.white, fontSize: 10),
rotateAngle: 45,
getTitles: (double value) {
if (value == 0) {
return '';
}
return '${value.toInt()}0k';
},
interval: 5,
margin: 8,
reservedSize: 30,
),
rightTitles: SideTitles(
showTitles: true,
textStyle: TextStyle(color: Colors.white, fontSize: 10),
rotateAngle: 90,
getTitles: (double value) {
if (value == 0) {
return '';
Expand Down
35 changes: 27 additions & 8 deletions lib/src/chart/bar_chart/bar_chart_painter.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,8 @@ import 'package:fl_chart/src/chart/base/base_chart/base_chart_painter.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';

import '../../utils/utils.dart';

class BarChartPainter extends AxisChartPainter<BarChartData> with TouchHandler<BarTouchResponse> {
Paint barPaint, bgTouchTooltipPaint;
Paint clearPaint;
Expand Down Expand Up @@ -287,8 +289,14 @@ class BarChartPainter extends AxisChartPainter<BarChartData> with TouchHandler<B
TextPainter(text: span, textAlign: TextAlign.center, textDirection: TextDirection.ltr);
tp.layout(maxWidth: getExtraNeededHorizontalSpace());
x -= tp.width + leftTitles.margin;
y -= tp.height / 2;
y -= getSideTitlesPosition(leftTitles.alignment, tp.height);
canvas.save();
canvas.translate(x + tp.width / 2, y + tp.height / 2);
canvas.rotate(radians(leftTitles.rotateAngle));
canvas.translate(-(x + tp.width / 2), -(y + tp.height / 2));
y -= translateRotatedPosition(tp.width, leftTitles.rotateAngle);
tp.paint(canvas, Offset(x, y));
canvas.restore();

verticalSeek += leftTitles.interval;
}
Expand All @@ -309,8 +317,14 @@ class BarChartPainter extends AxisChartPainter<BarChartData> with TouchHandler<B
TextPainter(text: span, textAlign: TextAlign.center, textDirection: TextDirection.ltr);
tp.layout(maxWidth: getExtraNeededHorizontalSpace());
x += rightTitles.margin;
y -= tp.height / 2;
y -= getSideTitlesPosition(rightTitles.alignment, tp.height);
canvas.save();
canvas.translate(x + tp.width / 2, y + tp.height / 2);
canvas.rotate(radians(rightTitles.rotateAngle));
canvas.translate(-(x + tp.width / 2), -(y + tp.height / 2));
y += translateRotatedPosition(tp.width, leftTitles.rotateAngle);
tp.paint(canvas, Offset(x, y));
canvas.restore();

verticalSeek += rightTitles.interval;
}
Expand All @@ -323,16 +337,21 @@ class BarChartPainter extends AxisChartPainter<BarChartData> with TouchHandler<B
final GroupBarsPosition groupBarPos = groupBarsPosition[index];

final String text = bottomTitles.getTitles(index.toDouble());

final TextSpan span = TextSpan(style: bottomTitles.textStyle, text: text);
final TextPainter tp =
TextPainter(text: span, textAlign: TextAlign.center, textDirection: TextDirection.ltr);
tp.layout();

final double textX = groupBarPos.groupX - (tp.width / 2);
final double textY = drawSize.height + getTopOffsetDrawSize() + bottomTitles.margin;

tp.paint(canvas, Offset(textX, textY));
double x = groupBarPos.groupX;
double y = drawSize.height + getTopOffsetDrawSize() + bottomTitles.margin;

x -= getSideTitlesPosition(bottomTitles.alignment, tp.width);
canvas.save();
canvas.translate(x + tp.width / 2, y + tp.height / 2);
canvas.rotate(radians(bottomTitles.rotateAngle));
canvas.translate(-(x + tp.width / 2), -(y + tp.height / 2));
x += translateRotatedPosition(tp.width, bottomTitles.rotateAngle);
tp.paint(canvas, Offset(x, y));
canvas.restore();
}
}
}
Expand Down
13 changes: 13 additions & 0 deletions lib/src/chart/base/base_chart/base_chart_data.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -111,6 +111,13 @@ class FlTitlesData {
}
}

/// this is mimic of [MainAxisAlignment] to aligning the [SideTitles]
enum SideTitlesAlignment {
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I think we don't need SideTitlesAlignment anymore?
Can you explain it's usage?

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The default position of TextPainter is center of it's x-axis point.
I just add this alignment for whom wanna set this view for better rendering in special cases.
If you think it's an irrelevant parameter I can remove it.

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Please let's remove it because it is not fully customizable, we can just customize the x-axis pivot, and for sure we should add customization for both axes.
We can add it in the future if it is needed.
Thanks!

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that's a good point, I just removed it.

start,
end,
center,
}

/// specify each side titles data
class SideTitles {
final bool showTitles;
Expand All @@ -119,6 +126,8 @@ class SideTitles {
final TextStyle textStyle;
final double margin;
final double interval;
final double rotateAngle;
final SideTitlesAlignment alignment;

const SideTitles({
this.showTitles = false,
Expand All @@ -130,6 +139,8 @@ class SideTitles {
),
this.margin = 6,
this.interval = 1.0,
this.rotateAngle = 0.0,
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this.alignment = SideTitlesAlignment.center,
});

static SideTitles lerp(SideTitles a, SideTitles b, double t) {
Expand All @@ -140,6 +151,8 @@ class SideTitles {
textStyle: TextStyle.lerp(a.textStyle, b.textStyle, t),
margin: lerpDouble(a.margin, b.margin, t),
interval: lerpDouble(a.interval, b.interval, t),
rotateAngle: lerpDouble(a.rotateAngle, b.rotateAngle, t),
alignment: b.alignment,
);
}
}
Expand Down
15 changes: 15 additions & 0 deletions lib/src/chart/base/base_chart/base_chart_painter.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,21 @@ abstract class BaseChartPainter<D extends BaseChartData> extends CustomPainter {
/// we should use this to offset our y axis when we drawing the chart,
/// and the height space we can use to draw chart is[getChartUsableDrawSize.height]
double getTopOffsetDrawSize() => 0;

/// calculate the position of text [SideTitles] base of its [SideTitlesAlignment]
/// like SideTitlesAlignment.start, center & end
double getSideTitlesPosition(SideTitlesAlignment alignment, double size) {
switch(alignment) {
case SideTitlesAlignment.start:
return size;
case SideTitlesAlignment.end:
return 0.0;
case SideTitlesAlignment.center:
return size / 2;
default:
return size / 2;
}
}
}

mixin TouchHandler<T extends BaseTouchResponse> {
Expand Down
38 changes: 30 additions & 8 deletions lib/src/chart/line_chart/line_chart_painter.dart
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Expand Up @@ -8,6 +8,7 @@ import 'package:fl_chart/src/chart/base/base_chart/touch_input.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';

import '../../utils/utils.dart';
import 'line_chart_data.dart';

class LineChartPainter extends AxisChartPainter<LineChartData> with TouchHandler<LineTouchResponse> {
Expand Down Expand Up @@ -578,8 +579,14 @@ class LineChartPainter extends AxisChartPainter<LineChartData> with TouchHandler
TextPainter(text: span, textAlign: TextAlign.center, textDirection: TextDirection.ltr);
tp.layout(maxWidth: getExtraNeededHorizontalSpace());
x -= tp.width + leftTitles.margin;
y -= tp.height / 2;
y -= getSideTitlesPosition(leftTitles.alignment, tp.height);
canvas.save();
canvas.translate(x + tp.width / 2, y + tp.height / 2);
canvas.rotate(radians(leftTitles.rotateAngle));
canvas.translate(-(x + tp.width / 2), -(y + tp.height / 2));
y -= translateRotatedPosition(tp.width, leftTitles.rotateAngle);
tp.paint(canvas, Offset(x, y));
canvas.restore();

verticalSeek += leftTitles.interval;
}
Expand All @@ -600,10 +607,15 @@ class LineChartPainter extends AxisChartPainter<LineChartData> with TouchHandler
TextPainter(text: span, textAlign: TextAlign.center, textDirection: TextDirection.ltr);
tp.layout();

x -= tp.width / 2;
x -= getSideTitlesPosition(topTitles.alignment, tp.width);
y -= topTitles.margin + tp.height;

canvas.save();
canvas.translate(x + tp.width / 2, y + tp.height / 2);
canvas.rotate(radians(topTitles.rotateAngle));
canvas.translate(-(x + tp.width / 2), -(y + tp.height / 2));
x -= translateRotatedPosition(tp.width, topTitles.rotateAngle);
tp.paint(canvas, Offset(x, y));
canvas.restore();

horizontalSeek += topTitles.interval;
}
Expand All @@ -623,9 +635,16 @@ class LineChartPainter extends AxisChartPainter<LineChartData> with TouchHandler
final TextPainter tp =
TextPainter(text: span, textAlign: TextAlign.center, textDirection: TextDirection.ltr);
tp.layout(maxWidth: getExtraNeededHorizontalSpace());

x += rightTitles.margin;
y -= tp.height / 2;
y -= getSideTitlesPosition(rightTitles.alignment, tp.height);
canvas.save();
canvas.translate(x + tp.width / 2, y + tp.height / 2);
canvas.rotate(radians(rightTitles.rotateAngle));
canvas.translate(-(x + tp.width / 2), -(y + tp.height / 2));
y += translateRotatedPosition(tp.width, leftTitles.rotateAngle);
tp.paint(canvas, Offset(x, y));
canvas.restore();

verticalSeek += rightTitles.interval;
}
Expand All @@ -638,18 +657,21 @@ class LineChartPainter extends AxisChartPainter<LineChartData> with TouchHandler
while (horizontalSeek <= data.maxX) {
double x = getPixelX(horizontalSeek, viewSize);
double y = viewSize.height + getTopOffsetDrawSize();

final String text = bottomTitles.getTitles(horizontalSeek);

final TextSpan span = TextSpan(style: bottomTitles.textStyle, text: text);
final TextPainter tp =
TextPainter(text: span, textAlign: TextAlign.center, textDirection: TextDirection.ltr);
tp.layout();

x -= tp.width / 2;
x -= getSideTitlesPosition(bottomTitles.alignment, tp.width);
y += bottomTitles.margin;

canvas.save();
canvas.translate(x + tp.width / 2, y + tp.height / 2);
canvas.rotate(radians(bottomTitles.rotateAngle));
canvas.translate(-(x + tp.width / 2), -(y + tp.height / 2));
x += translateRotatedPosition(tp.width, bottomTitles.rotateAngle);
tp.paint(canvas, Offset(x, y));
canvas.restore();

horizontalSeek += bottomTitles.interval;
}
Expand Down
36 changes: 30 additions & 6 deletions lib/src/chart/scatter_chart/scatter_chart_painter.dart
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Expand Up @@ -5,6 +5,7 @@ import 'package:fl_chart/src/chart/base/base_chart/touch_input.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';

import '../../utils/utils.dart';
import 'scatter_chart_data.dart';

class ScatterChartPainter extends AxisChartPainter<ScatterChartData> with TouchHandler<ScatterTouchResponse> {
Expand Down Expand Up @@ -65,8 +66,14 @@ class ScatterChartPainter extends AxisChartPainter<ScatterChartData> with TouchH
TextPainter(text: span, textAlign: TextAlign.center, textDirection: TextDirection.ltr);
tp.layout(maxWidth: getExtraNeededHorizontalSpace());
x -= tp.width + leftTitles.margin;
y -= tp.height / 2;
y -= getSideTitlesPosition(leftTitles.alignment, tp.height);
canvas.save();
canvas.translate(x + tp.width / 2, y + tp.height / 2);
canvas.rotate(radians(leftTitles.rotateAngle));
canvas.translate(-(x + tp.width / 2), -(y + tp.height / 2));
y -= translateRotatedPosition(tp.width, leftTitles.rotateAngle);
tp.paint(canvas, Offset(x, y));
canvas.restore();

verticalSeek += leftTitles.interval;
}
Expand All @@ -87,10 +94,15 @@ class ScatterChartPainter extends AxisChartPainter<ScatterChartData> with TouchH
TextPainter(text: span, textAlign: TextAlign.center, textDirection: TextDirection.ltr);
tp.layout();

x -= tp.width / 2;
x -= getSideTitlesPosition(topTitles.alignment, tp.width);
y -= topTitles.margin + tp.height;

canvas.save();
canvas.translate(x + tp.width / 2, y + tp.height / 2);
canvas.rotate(radians(topTitles.rotateAngle));
canvas.translate(-(x + tp.width / 2), -(y + tp.height / 2));
x -= translateRotatedPosition(tp.width, topTitles.rotateAngle);
tp.paint(canvas, Offset(x, y));
canvas.restore();

horizontalSeek += topTitles.interval;
}
Expand All @@ -110,9 +122,16 @@ class ScatterChartPainter extends AxisChartPainter<ScatterChartData> with TouchH
final TextPainter tp =
TextPainter(text: span, textAlign: TextAlign.center, textDirection: TextDirection.ltr);
tp.layout(maxWidth: getExtraNeededHorizontalSpace());

x += rightTitles.margin;
y -= tp.height / 2;
y -= getSideTitlesPosition(rightTitles.alignment, tp.height);
canvas.save();
canvas.translate(x + tp.width / 2, y + tp.height / 2);
canvas.rotate(radians(rightTitles.rotateAngle));
canvas.translate(-(x + tp.width / 2), -(y + tp.height / 2));
y += translateRotatedPosition(tp.width, leftTitles.rotateAngle);
tp.paint(canvas, Offset(x, y));
canvas.restore();

verticalSeek += rightTitles.interval;
}
Expand All @@ -133,10 +152,15 @@ class ScatterChartPainter extends AxisChartPainter<ScatterChartData> with TouchH
TextPainter(text: span, textAlign: TextAlign.center, textDirection: TextDirection.ltr);
tp.layout();

x -= tp.width / 2;
x -= getSideTitlesPosition(bottomTitles.alignment, tp.width);
y += bottomTitles.margin;

canvas.save();
canvas.translate(x + tp.width / 2, y + tp.height / 2);
canvas.rotate(radians(bottomTitles.rotateAngle));
canvas.translate(-(x + tp.width / 2), -(y + tp.height / 2));
x += translateRotatedPosition(tp.width, bottomTitles.rotateAngle);
tp.paint(canvas, Offset(x, y));
canvas.restore();

horizontalSeek += bottomTitles.interval;
}
Expand Down
5 changes: 5 additions & 0 deletions lib/src/utils/utils.dart
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Expand Up @@ -22,3 +22,8 @@ Size getDefaultSize(BuildContext context) {
size *= 0.7;
return size;
}

/// forward the view base on its degree
double translateRotatedPosition(double size, double degree) {
return (size / 4) * math.sin(radians(degree.abs()));
}
8 changes: 7 additions & 1 deletion repo_files/documentations/base_chart.md
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Expand Up @@ -29,10 +29,16 @@
|reservedSize| a reserved space to show titles|22|
|textStyle| [TextStyle](https://api.flutter.dev/flutter/painting/TextStyle-class.html) to determine the style of texts |TextStyle(color: Colors.black, fontSize: 11)|
|margin| margin of horizontal the titles | 6|
|interval| interval between of showing titles in this side, | 1.0 |
|interval| interval between of showing titles in this side | 1.0 |
|rotateAngle| the clockwise angle of rotating title in degree | 0.0 |
|alignment| a [SideTitlesAlignment](#SideTitlesAlignment) of title | SideTitlesAlignment.center |



### SideTitlesAlignment
enum values {`start`, `end`, `center`}



### FlTouchInput
an abstract class that contains a [Offset](https://api.flutter.dev/flutter/dart-ui/Offset-class.html) with x and y of touched point, there is some concrete classes to distinguish between touch behaviours,
Expand Down
Binary file modified repo_files/images/bar_chart/bar_chart_sample_5.png
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