SciChart® the market leader in Fast WPF Charts, WPF 3D Charts, and iOS Chart & Android Chart Components
Android Chart Annotations
// Android Chart Examples
SciChart Android ships with ~90 Android Chart Examples which you can browse, play with, view the source-code and even export each SciChart Android Chart Example to a stand-alone Android Studio project. All of this is possible with the new and improved SciChart Android Examples Suite, which ships as part of our Android Charts SDK.
An introduction to the SciChart Android Chart Annotations API, which allows custom Android Views to be placed over the chart at specific X and Y data-values.
Annotation Types Include
– AxisMarkerAnnotation
– BoxAnnotation
– CustomAnnotation
– HorizontalLineAnnotation
– LineAnnotation
– LineArrowAnnotation
– TextAnnotation
– VerticalLineAnnotation
// Source Code
The full source code for the Android Chart Annotations example is included below (Scroll down!).
Did you know you can also view the source code from one of the following sources as well?
- Clone the SciChart.Android.Examples from Github.
- Or, view source and export each example to an Android Studio project from the Java version of the SciChart Android Examples app.
- Also the SciChart Android Trial contains the full source for the examples (link below).
The SciChart Examples source code is available on Github and viewable in-app for some platforms
// example_single_chart_fragment.xml
<?xml version="1.0" encoding="utf-8"?><!--*************************************************************************-->
<!-- SCICHART® Copyright SciChart Ltd. 2011-2016. All rights reserved. -->
<!-- -->
<!-- Web: http://www.scichart.com -->
<!-- Support: support@scichart.com -->
<!-- Sales: sales@scichart.com -->
<!-- -->
<!-- example_single_chart_fragment.xml is part of the SCICHART® Examples. Permission is hereby granted -->
<!-- to modify, create derivative works, distribute and publish any part of this source -->
<!-- code whether for commercial, private or personal use. -->
<!-- -->
<!-- The SCICHART® examples are distributed in the hope that they will be useful, but -->
<!-- without any warranty. It is provided "AS IS" without warranty of any kind, either -->
<!-- expressed or implied. -->
<!--*************************************************************************-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.scichart.charting.visuals.SciChartSurface
android:id="@+id/chart"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>// AnnotationsAreEasyFragment.java
//******************************************************************************
// SCICHART® Copyright SciChart Ltd. 2011-2017. All rights reserved.
//
// Web: http://www.scichart.com
// Support: support@scichart.com
// Sales: sales@scichart.com
//
// AnnotationsAreEasyFragment.java is part of the SCICHART® Examples. Permission is hereby granted
// to modify, create derivative works, distribute and publish any part of this source
// code whether for commercial, private or personal use.
//
// The SCICHART® examples are distributed in the hope that they will be useful, but
// without any warranty. It is provided "AS IS" without warranty of any kind, either
// expressed or implied.
//******************************************************************************
package com.scichart.examples.fragments;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.View;
import com.scichart.charting.visuals.SciChartSurface;
import com.scichart.charting.visuals.annotations.AnnotationCoordinateMode;
import com.scichart.charting.visuals.annotations.HorizontalAnchorPoint;
import com.scichart.charting.visuals.annotations.LabelPlacement;
import com.scichart.charting.visuals.annotations.VerticalAnchorPoint;
import com.scichart.charting.visuals.axes.IAxis;
import com.scichart.core.framework.UpdateSuspender;
import com.scichart.drawing.utility.ColorUtil;
import com.scichart.examples.R;
import com.scichart.examples.fragments.base.ExampleBaseFragment;
import java.util.Collections;
import butterknife.BindView;
public class AnnotationsAreEasyFragment extends ExampleBaseFragment {
@BindView(R.id.chart)
SciChartSurface surface;
@Override
public boolean showDefaultModifiersInToolbar() {
return false;
}
@Override
protected int getLayoutId() {
return R.layout.example_single_chart_fragment;
}
@Override
protected void initExample() {
UpdateSuspender.using(surface, new Runnable() {
@Override
public void run() {
final IAxis xAxis = sciChartBuilder.newNumericAxis()
.withVisibleRange(0d, 10d)
.withGrowBy(0.1d, 0.1d)
.withTextFormatting("0.0#")
.build();
final IAxis yAxis = sciChartBuilder.newNumericAxis()
.withVisibleRange(0d, 10d)
.withGrowBy(0.1d, 0.1d)
.withTextFormatting("0.0#")
.build();
Collections.addAll(surface.getXAxes(), xAxis);
Collections.addAll(surface.getYAxes(), yAxis);
Collections.addAll(surface.getAnnotations(),
// Watermark
sciChartBuilder.newTextAnnotation()
.withX1(0.5)
.withY1(0.5)
.withFontStyle(Typeface.DEFAULT_BOLD, 42, 0x22FFFFFF)
.withCoordinateMode(AnnotationCoordinateMode.Relative)
.withHorizontalAnchorPoint(HorizontalAnchorPoint.Center)
.withVerticalAnchorPoint(VerticalAnchorPoint.Center)
.withText("Create \n Watermarks")
.withTextGravity(Gravity.CENTER)
.build(),
// Text annotations
sciChartBuilder.newTextAnnotation()
.withX1(0.3)
.withY1(9.7)
.withFontStyle(24, ColorUtil.White)
.withText("Annotations are Easy!")
.build(),
sciChartBuilder.newTextAnnotation()
.withX1(1.0)
.withY1(9.0)
.withText("You can create text")
.withFontStyle(10, ColorUtil.White)
.build(),
// Text with Anchor Points
sciChartBuilder.newTextAnnotation()
.withX1(5d)
.withY1(8d)
.withHorizontalAnchorPoint(HorizontalAnchorPoint.Center)
.withVerticalAnchorPoint(VerticalAnchorPoint.Bottom)
.withText("Anchor Center (X1, Y1)")
.build(),
sciChartBuilder.newTextAnnotation()
.withX1(5d)
.withY1(8d)
.withHorizontalAnchorPoint(HorizontalAnchorPoint.Right)
.withVerticalAnchorPoint(VerticalAnchorPoint.Top)
.withText("Anchor Right")
.build(),
sciChartBuilder.newTextAnnotation()
.withX1(5d)
.withY1(8d)
.withHorizontalAnchorPoint(HorizontalAnchorPoint.Left)
.withVerticalAnchorPoint(VerticalAnchorPoint.Top)
.withText("or Anchor Left")
.build(),
// Line and LineArrow annotation
sciChartBuilder.newTextAnnotation()
.withText("Draw Lines with \nor without arrows")
.withX1(0.3).withY1(6.1)
.withFontStyle(12, ColorUtil.White)
.withVerticalAnchorPoint(VerticalAnchorPoint.Bottom)
.build(),
sciChartBuilder.newLineAnnotation()
.withPosition(1d, 4d, 2d, 6d)
.withStroke(2f, 0xFF555555)
.build(),
sciChartBuilder.newLineArrowAnnotation()
.withPosition(1.2d, 3.8d, 2.5d, 6d)
.withStroke(2f, 0xFF555555)
.withArrowHeadLength(4)
.withArrowHeadWidth(8)
.build(),
// Boxes
sciChartBuilder.newTextAnnotation()
.withText("Draw Boxes")
.withX1(3.5).withY1(6.1)
.withFontStyle(12, ColorUtil.White)
.withVerticalAnchorPoint(VerticalAnchorPoint.Bottom)
.build(),
sciChartBuilder.newBoxAnnotation()
.withPosition(3.5d, 4d, 5d, 5d)
.withBackgroundDrawableId(R.drawable.example_box_annotation_background_1)
.build(),
sciChartBuilder.newBoxAnnotation()
.withPosition(4d, 4.5d, 5.5d, 5.5d)
.withBackgroundDrawableId(R.drawable.example_box_annotation_background_2)
.build(),
sciChartBuilder.newBoxAnnotation()
.withPosition(4.5d, 5d, 6d, 6d)
.withBackgroundDrawableId(R.drawable.example_box_annotation_background_3)
.build(),
// Custom Shapes
sciChartBuilder.newTextAnnotation()
.withText("Or Custom Shapes")
.withX1(7).withY1(6.1)
.withFontStyle(12, ColorUtil.White)
.withVerticalAnchorPoint(VerticalAnchorPoint.Bottom)
.build(),
sciChartBuilder.newCustomAnnotation()
.withPosition(8d, 5.5d)
.withContent(R.layout.example_custom_annotation_view)
.build(),
sciChartBuilder.newCustomAnnotation()
.withPosition(7.5d, 5d)
.withContent(new CustomView2(getActivity()))
.build(),
// Horizontal Lines
sciChartBuilder.newHorizontalLineAnnotation()
.withPosition(5d, 3.2d)
.withStroke(2, ColorUtil.Orange)
.withHorizontalGravity(Gravity.RIGHT)
.withAnnotationLabel(LabelPlacement.TopLeft, "Right Aligned, with text on left")
.build(),
sciChartBuilder.newHorizontalLineAnnotation()
.withPosition(7d, 2.8d)
.withStroke(2, ColorUtil.Orange)
.withAnnotationLabel(LabelPlacement.Axis)
.build(),
// Vertical Lines
sciChartBuilder.newVerticalLineAnnotation()
.withPosition(9d, 4d)
.withVerticalGravity(Gravity.BOTTOM)
.withStroke(2, ColorUtil.Brown)
.withAnnotationLabel()
.build(),
sciChartBuilder.newVerticalLineAnnotation()
.withPosition(9.5d, 3d)
.withStroke(2, ColorUtil.Brown)
.withAnnotationLabel()
.withAnnotationLabel(LabelPlacement.TopRight, "Bottom-aligned", 90)
.build());
surface.getChartModifiers().add(sciChartBuilder.newModifierGroupWithDefaultModifiers().build());
}
});
}
public static class CustomView1 extends View {
private final int FILL_COLOR = Color.parseColor("#571CB61C");
private final int STROKE_COLOR = Color.parseColor("#FF00B400");
private final Path path = new Path();
private final Paint paintFill = new Paint();
private final Paint paintStroke = new Paint();
public CustomView1(Context context) {
super(context);
init();
}
public CustomView1(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
paintFill.setStyle(Paint.Style.FILL);
paintFill.setColor(FILL_COLOR);
paintStroke.setStyle(Paint.Style.STROKE);
paintStroke.setColor(STROKE_COLOR);
path.moveTo(0, 15);
path.lineTo(15, 0);
path.lineTo(30, 15);
path.lineTo(20, 15);
path.lineTo(20, 30);
path.lineTo(10, 30);
path.lineTo(10, 15);
path.lineTo(0, 15);
setMinimumHeight(50);
setMinimumWidth(50);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawPath(path, paintFill);
canvas.drawPath(path, paintStroke);
}
}
public static class CustomView2 extends View {
private final int FILL_COLOR = Color.parseColor("#57B22020");
private final int STROKE_COLOR = Color.parseColor("#FF990000");
private final Path path = new Path();
private final Paint paintFill = new Paint();
private final Paint paintStroke = new Paint();
public CustomView2(Context context) {
super(context);
paintFill.setStyle(Paint.Style.FILL);
paintFill.setColor(FILL_COLOR);
paintStroke.setStyle(Paint.Style.STROKE);
paintStroke.setColor(STROKE_COLOR);
path.moveTo(0, 15);
path.lineTo(10, 15);
path.lineTo(10, 0);
path.lineTo(20, 0);
path.lineTo(20, 15);
path.lineTo(30, 15);
path.lineTo(15, 30);
path.lineTo(0, 15);
setMinimumHeight(50);
setMinimumWidth(50);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawPath(path, paintFill);
canvas.drawPath(path, paintStroke);
}
}
}