package com.github.mikephil.charting.charts;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PointF;
import android.graphics.Paint.Align;
import android.util.AttributeSet;
import android.util.Log;
import com.github.mikephil.charting.data.DataSet;
import com.github.mikephil.charting.data.Entry;
import com.github.mikephil.charting.data.RadarData;
import com.github.mikephil.charting.data.RadarDataSet;
import com.github.mikephil.charting.utils.Utils;
import com.github.mikephil.charting.utils.XLabels;
import com.github.mikephil.charting.utils.YLabels;
import com.github.mikephil.charting.utils.Legend.LegendPosition;
import java.util.ArrayList;
/**
* Implementation of the RadarChart, a "spidernet"-like chart. It works best
* when displaying 5-10 entries per DataSet.
*
* @author Philipp Jahoda
*/
public class RadarChart extends PieRadarChartBase {
/** paint for drawing the web */
private Paint mWebPaint;
/** width of the main web lines */
private float mWebLineWidth = 2.5f;
/** width of the inner web lines */
private float mInnerWebLineWidth = 1.5f;
/** color for the main web lines */
private int mWebColor = Color.rgb(122, 122, 122);
/** color for the inner web */
private int mWebColorInner = Color.rgb(122, 122, 122);
/** transparency the grid is drawn with (0-255) */
private int mWebAlpha = 150;
/** flag indicating if the y-labels should be drawn or not */
protected boolean mDrawYLabels = true;
/** flag indicating if the x-labels should be drawn or not */
protected boolean mDrawXLabels = true;
/** the object reprsenting the y-axis labels */
private YLabels mYLabels = new YLabels();
/** the object representing the x-axis labels */
private XLabels mXLabels = new XLabels();
public RadarChart(Context context) {
super(context);
}
public RadarChart(Context context, AttributeSet attrs) {
super(context, attrs);
}
public RadarChart(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void init() {
super.init();
mWebLineWidth = Utils.convertDpToPixel(1.5f);
mInnerWebLineWidth = Utils.convertDpToPixel(0.75f);
mWebPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mWebPaint.setStyle(Paint.Style.STROKE);
mHighlightPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mHighlightPaint.setStyle(Paint.Style.STROKE);
mHighlightPaint.setStrokeWidth(2f);
mHighlightPaint.setColor(Color.rgb(255, 187, 115));
}
/**
* Sets a RadarData object for the chart to display.
*
* @param data
*/
public void setData(RadarData data) {
super.setData(data);
}
@Override
protected void calcMinMax(boolean fixedValues) {
super.calcMinMax(fixedValues);
mYChartMin = 0;
}
@Override
public void prepare() {
super.prepare();
prepareXLabels();
}
@Override
protected void calculateOffsets() {
if (mLegend == null)
return;
// setup offsets for legend
if (mLegend.getPosition() == LegendPosition.RIGHT_OF_CHART) {
mLegend.setOffsetRight(mLegend.getMaximumEntryLength(mLegendLabelPaint));
mLegendLabelPaint.setTextAlign(Align.LEFT);
} else if (mLegend.getPosition() == LegendPosition.BELOW_CHART_LEFT
|| mLegend.getPosition() == LegendPosition.BELOW_CHART_RIGHT
|| mLegend.getPosition() == LegendPosition.BELOW_CHART_CENTER) {
mLegend.setOffsetBottom(mLegendLabelPaint.getTextSize() * 5.5f);
}
mLegend.setOffsetTop(mOffsetTop);
mLegend.setOffsetLeft(mOffsetLeft);
if (mDrawLegend) {
mOffsetBottom = Math.max(mXLabels.mLabelWidth, mOffsetBottom);
mOffsetTop = Math.max(mXLabels.mLabelWidth, mOffsetTop);
mOffsetRight = Math.max(mXLabels.mLabelWidth, mOffsetRight);
mOffsetLeft = Math.max(mXLabels.mLabelWidth, mOffsetLeft);
mOffsetBottom = Math.max(mOffsetBottom, mLegend.getOffsetBottom());
mOffsetRight = Math.max(mOffsetRight, mLegend.getOffsetRight() / 3 * 2);
}
applyCalculatedOffsets();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mDataNotSet)
return;
long starttime = System.currentTimeMillis();
prepareYLabels();
drawXLabels();
drawWeb();
drawData();
drawAdditional();
drawHighlights();
drawYLabels();
drawValues();
drawLegend();
drawDescription();
drawMarkers();
canvas.drawBitmap(mDrawBitmap, 0, 0, mDrawPaint);
Log.i(LOG_TAG, "RadarChart DrawTime: " + (System.currentTimeMillis() - starttime) + " ms");
}
/**
* Draws the spider web.
*/
private void drawWeb() {
float sliceangle = getSliceAngle();
// calculate the factor that is needed for transforming the value to
// pixels
float factor = getFactor();
PointF c = getCenterOffsets();
// draw the web lines that come from the center
mWebPaint.setStrokeWidth(mWebLineWidth);
mWebPaint.setColor(mWebColor);
mWebPaint.setAlpha(mWebAlpha);
for (int i = 0; i < mCurrentData.getXValCount(); i++) {
PointF p = getPosition(c, mYChartMax * factor, sliceangle * i + mRotationAngle);
mDrawCanvas.drawLine(c.x, c.y, p.x, p.y, mWebPaint);
}
// draw the inner-web
mWebPaint.setStrokeWidth(mInnerWebLineWidth);
mWebPaint.setColor(mWebColorInner);
mWebPaint.setAlpha(mWebAlpha);
int labelCount = mYLabels.mEntryCount;
for (int j = 0; j < labelCount; j++) {
for (int i = 0; i < mCurrentData.getXValCount(); i++) {
float r = ((mYChartMax / labelCount) * (j + 1)) * factor;
PointF p1 = getPosition(c, r, sliceangle * i + mRotationAngle);
PointF p2 = getPosition(c, r, sliceangle * (i + 1) + mRotationAngle);
mDrawCanvas.drawLine(p1.x, p1.y, p2.x, p2.y, mWebPaint);
}
}
}
@Override
protected void drawData() {
ArrayList<RadarDataSet> dataSets = (ArrayList<RadarDataSet>) mCurrentData.getDataSets();
float sliceangle = getSliceAngle();
// calculate the factor that is needed for transforming the value to
// pixels
float factor = getFactor();
PointF c = getCenterOffsets();
for (int i = 0; i < mCurrentData.getDataSetCount(); i++) {
RadarDataSet dataSet = dataSets.get(i);
ArrayList<? extends Entry> entries = dataSet.getYVals();
Path surface = new Path();
for (int j = 0; j < entries.size(); j++) {
mRenderPaint.setColor(dataSet.getColor(j));
Entry e = entries.get(j);
PointF p = getPosition(c, e.getVal() * factor, sliceangle * j + mRotationAngle);
if (j == 0)
surface.moveTo(p.x, p.y);
else
surface.lineTo(p.x, p.y);
}
surface.close();
// draw filled
if (dataSet.isDrawFilledEnabled()) {
mRenderPaint.setStyle(Paint.Style.FILL);
mRenderPaint.setAlpha(dataSet.getFillAlpha());
mDrawCanvas.drawPath(surface, mRenderPaint);
mRenderPaint.setAlpha(255);
}
mRenderPaint.setStrokeWidth(dataSet.getLineWidth());
mRenderPaint.setStyle(Paint.Style.STROKE);
// draw the line (only if filled is disabled or alpha is below 255)
if (!dataSet.isDrawFilledEnabled() || dataSet.getFillAlpha() < 255)
mDrawCanvas.drawPath(surface, mRenderPaint);
}
}
/**
* Calculates the required maximum y-value in order to be able to provide
* the desired number of label entries and rounded label values.
*/
private void prepareYLabels() {
int labelCount = mYLabels.getLabelCount();
double range = mCurrentData.getYMax() - mYChartMin;
double rawInterval = range / labelCount;
double interval = Utils.roundToNextSignificant(rawInterval);
double intervalMagnitude = Math.pow(10, (int) Math.log10(interval));
int intervalSigDigit = (int) (interval / intervalMagnitude);
if (intervalSigDigit > 5) {
// Use one order of magnitude higher, to avoid intervals like 0.9 or
// 90
interval = Math.floor(10 * intervalMagnitude);
}
double first = Math.ceil(mYChartMin / interval) * interval;
double last = Utils.nextUp(Math.floor(mCurrentData.getYMax() / interval) * interval);
double f;
int n = 0;
for (f = first; f <= last; f += interval) {
++n;
}
mYLabels.mEntryCount = n;
mYChartMax = (float) interval * n;
// calc delta
mDeltaY = Math.abs(mYChartMax - mYChartMin);
}
/**
* Draws the y-labels of the RadarChart.
*/
private void drawYLabels() {
if (!mDrawYLabels)
return;
mYLabelPaint.setTypeface(mYLabels.getTypeface());
mYLabelPaint.setTextSize(mYLabels.getTextSize());
mYLabelPaint.setColor(mYLabels.getTextColor());
PointF c = getCenterOffsets();
float factor = getFactor();
int labelCount = mYLabels.mEntryCount;
for (int j = 0; j < labelCount; j++) {
float r = ((mYChartMax / labelCount) * j) * factor;
PointF p = getPosition(c, r, mRotationAngle);
mDrawCanvas.drawText(Utils.formatNumber(r / factor, mYLabels.mDecimals,
mSeparateTousands), p.x + 10, p.y - 5, mYLabelPaint);
}
}
/**
* setup the x-axis labels
*/
private void prepareXLabels() {
StringBuffer a = new StringBuffer();
int max = (int) Math.round(mCurrentData.getXValAverageLength());
for (int i = 0; i < max; i++) {
a.append("h");
}
mXLabels.mLabelWidth = Utils.calcTextWidth(mXLabelPaint, a.toString());
mXLabels.mLabelHeight = Utils.calcTextWidth(mXLabelPaint, "Q");
Log.i(LOG_TAG, "xlabels prepared, width: " + mXLabels.mLabelWidth);
}
/**
* Draws the x-labels of the chart.
*/
private void drawXLabels() {
if (!mDrawXLabels)
return;
mXLabelPaint.setTypeface(mXLabels.getTypeface());
mXLabelPaint.setTextSize(mXLabels.getTextSize());
mXLabelPaint.setColor(mXLabels.getTextColor());
float sliceangle = getSliceAngle();
// calculate the factor that is needed for transforming the value to
// pixels
float factor = getFactor();
PointF c = getCenterOffsets();
for (int i = 0; i < mCurrentData.getXValCount(); i++) {
String text = mCurrentData.getXVals().get(i);
float angle = (sliceangle * i + mRotationAngle) % 360f;
PointF p = getPosition(c, mYChartMax * factor + mXLabels.mLabelWidth / 2f, angle);
mDrawCanvas.drawText(text, p.x, p.y + mXLabels.mLabelHeight / 2f, mXLabelPaint);
}
}
@Override
protected void drawValues() {
// if values are drawn
if (mDrawYValues) {
float sliceangle = getSliceAngle();
// calculate the factor that is needed for transforming the value to
// pixels
float factor = getFactor();
PointF c = getCenterOffsets();
float yoffset = Utils.convertDpToPixel(5f);
for (int i = 0; i < mCurrentData.getDataSetCount(); i++) {
DataSet dataSet = mCurrentData.getDataSetByIndex(i);
ArrayList<? extends Entry> entries = dataSet.getYVals();
for (int j = 0; j < entries.size(); j++) {
Entry e = entries.get(j);
PointF p = getPosition(c, e.getVal() * factor, sliceangle * j + mRotationAngle);
mDrawCanvas.drawText(
Utils.formatNumber(e.getVal(), mValueFormatDigits, mSeparateTousands),
p.x, p.y - yoffset, mValuePaint);
}
}
}
}
@Override
protected void drawHighlights() {
// if there are values to highlight and highlighnting is enabled, do it
if (mHighlightEnabled && valuesToHighlight()) {
float sliceangle = getSliceAngle();
float factor = getFactor();
PointF c = getCenterOffsets();
for (int i = 0; i < mIndicesToHightlight.length; i++) {
RadarDataSet set = (RadarDataSet) mCurrentData
.getDataSetByIndex(mIndicesToHightlight[i]
.getDataSetIndex());
mHighlightPaint.setColor(set.getHighLightColor());
// get the index to highlight
int xIndex = mIndicesToHightlight[i].getXIndex();
Entry e = set.getEntryForXIndex(xIndex);
int j = set.getEntryPosition(e);
float y = e.getVal();
PointF p = getPosition(c, y * factor, sliceangle * j + mRotationAngle);
float[] pts = new float[] {
p.x, 0, p.x, getHeight(), 0, p.y, getWidth(), p.y
};
mDrawCanvas.drawLines(pts, mHighlightPaint);
}
}
}
/**
* Calculates the position on the RadarChart depending on the center of the
* chart, the value and angle.
*
* @param center
* @param val
* @param angle in degrees, converted to radians internally
* @return
*/
private PointF getPosition(PointF c, float val, float angle) {
PointF p = new PointF((float) (c.x + val * Math.cos(Math.toRadians(angle))),
(float) (c.y + val * Math.sin(Math.toRadians(angle))));
return p;
}
/**
* Returns the factor that is needed to transform values into pixels.
*
* @return
*/
public float getFactor() {
return (float) Math.min(mContentRect.width() / 2, mContentRect.height() / 2)
/ mYChartMax;
}
/**
* Returns the angle that each slice in the radar chart occupies.
*
* @return
*/
public float getSliceAngle() {
return 360f / (float) mCurrentData.getXValCount();
}
@Override
public int getIndexForAngle(float angle) {
// take the current angle of the chart into consideration
float a = (angle - mRotationAngle + 360) % 360f;
float sliceangle = getSliceAngle();
for (int i = 0; i < mCurrentData.getXValCount(); i++) {
if (sliceangle * (i + 1) - sliceangle / 2f > a)
return i;
}
return 0;
}
/**
* Returns the object that represents all y-labels of the RadarChart.
*
* @return
*/
public YLabels getYLabels() {
return mYLabels;
}
/**
* Returns the object that represents all x-labels of the RadarChart.
*
* @return
*/
public XLabels getXLabels() {
return mXLabels;
}
/**
* Sets the width of the web lines that come from the center.
*
* @param width
*/
public void setWebLineWidth(float width) {
mWebLineWidth = Utils.convertDpToPixel(width);
}
/**
* Sets the width of the web lines that are in between the lines coming from
* the center.
*
* @param width
*/
public void setWebLineWidthInner(float width) {
mInnerWebLineWidth = Utils.convertDpToPixel(width);
}
/**
* Sets the transparency (alpha) value for all web lines, default: 150, 255
* = 100% opaque, 0 = 100% transparent
*
* @param alpha
*/
public void setWebAlpha(int alpha) {
mWebAlpha = alpha;
}
/**
* Sets the color for the web lines that come from the center. Don't forget
* to use getResources().getColor(...) when loading a color from the
* resources. Default: Color.rgb(122, 122, 122)
*
* @param color
*/
public void setWebColor(int color) {
mWebColor = color;
}
/**
* Sets the color for the web lines in between the lines that come from the
* center. Don't forget to use getResources().getColor(...) when loading a
* color from the resources. Default: Color.rgb(122, 122, 122)
*
* @param color
*/
public void setWebColorInner(int color) {
mWebColorInner = color;
}
/**
* set this to true to enable drawing the y-labels, false if not
*
* @param enabled
*/
public void setDrawYLabels(boolean enabled) {
mDrawYLabels = enabled;
}
/**
* set this to true to enable drawing the x-labels, false if not
*
* @param enabled
*/
public void setDrawXLabels(boolean enabled) {
mDrawXLabels = enabled;
}
/**
* Returns true if drawing y-labels is enabled, false if not.
*
* @return
*/
public boolean isDrawYLabelsEnabled() {
return mDrawYLabels;
}
/**
* Returns true if drawing x-labels is enabled, false if not.
*
* @return
*/
public boolean isDrawXLabelsEnabled() {
return mDrawXLabels;
}
@Override
public float getRadius() {
if (mContentRect == null)
return 0;
else
return Math.min(mContentRect.width() / 2f, mContentRect.height() / 2f);
}
@Override
public void setPaint(Paint p, int which) {
super.setPaint(p, which);
switch (which) {
case PAINT_RADAR_WEB:
mWebPaint = p;
break;
}
}
@Override
public Paint getPaint(int which) {
Paint p = super.getPaint(which);
if (p != null)
return p;
switch (which) {
case PAINT_RADAR_WEB:
return mWebPaint;
}
return null;
}
}