/**
* Copyright (C) 2009, 2010 SC 4ViewSoft SRL
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.achartengine.chart;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.achartengine.model.Point;
import org.achartengine.model.SeriesSelection;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.model.XYSeries;
import org.achartengine.renderer.BasicStroke;
import org.achartengine.renderer.DefaultRenderer;
import org.achartengine.renderer.SimpleSeriesRenderer;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYMultipleSeriesRenderer.Orientation;
import org.achartengine.util.MathHelper;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.DashPathEffect;
import android.graphics.Paint;
import android.graphics.Paint.Align;
import android.graphics.Paint.Cap;
import android.graphics.Paint.Join;
import android.graphics.Paint.Style;
import android.graphics.PathEffect;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.Typeface;
import android.view.View;
/**
* The XY chart rendering class.
*/
public abstract class XYChart extends AbstractChart {
/** The multiple series dataset. */
protected XYMultipleSeriesDataset mDataset;
/** The multiple series renderer. */
protected XYMultipleSeriesRenderer mRenderer;
/** The current scale value. */
private float mScale;
/** The current translate value. */
private float mTranslate;
/** The canvas center point. */
private Point mCenter;
/** The visible chart area, in screen coordinates. */
transient private Rect mScreenR;
/** The calculated range. */
private Map<Integer, double[]> mCalcRange = new HashMap<Integer, double[]>();
/**
* The clickable areas for all points. The array index is the series index,
* and the RectF list index is the point index in that series.
*/
transient private Map<Integer, List<RectF>> clickableAreas = new HashMap<Integer, List<RectF>>();
protected XYChart() {
}
/**
* Builds a new XY chart instance.
*
* @param dataset the multiple series dataset
* @param renderer the multiple series renderer
*/
public XYChart(XYMultipleSeriesDataset dataset, XYMultipleSeriesRenderer renderer) {
mDataset = dataset;
mRenderer = renderer;
}
// TODO: javadoc
protected void setDatasetRenderer(XYMultipleSeriesDataset dataset,
XYMultipleSeriesRenderer renderer) {
mDataset = dataset;
mRenderer = renderer;
}
/**
* The graphical representation of the XY chart.
*
* @param canvas the canvas to paint to
* @param x the top left x value of the view to draw to
* @param y the top left y value of the view to draw to
* @param width the width of the view to draw to
* @param height the height of the view to draw to
* @param paint the paint
*/
public void draw(Canvas canvas, int x, int y, int width, int height, Paint paint) {
paint.setAntiAlias(mRenderer.isAntialiasing());
int legendSize = getLegendSize(mRenderer, height / 5, mRenderer.getAxisTitleTextSize());
int[] margins = mRenderer.getMargins();
int left = x + margins[1];
int top = y + margins[0];
int right = x + width - margins[3];
int sLength = mDataset.getSeriesCount();
String[] titles = new String[sLength];
for (int i = 0; i < sLength; i++) {
titles[i] = mDataset.getSeriesAt(i).getTitle();
}
if (mRenderer.isFitLegend() && mRenderer.isShowLegend()) {
legendSize = drawLegend(canvas, mRenderer, titles, left, right, y, width, height, legendSize,
paint, true);
}
int bottom = y + height - margins[2] - legendSize;
if (mScreenR == null) {
mScreenR = new Rect();
}
mScreenR.set(left, top, right, bottom);
drawBackground(mRenderer, canvas, x, y, width, height, paint, false, DefaultRenderer.NO_COLOR);
if (paint.getTypeface() == null
|| !paint.getTypeface().toString().equals(mRenderer.getTextTypefaceName())
|| paint.getTypeface().getStyle() != mRenderer.getTextTypefaceStyle()) {
paint.setTypeface(Typeface.create(mRenderer.getTextTypefaceName(), mRenderer
.getTextTypefaceStyle()));
}
Orientation or = mRenderer.getOrientation();
if (or == Orientation.VERTICAL) {
right -= legendSize;
bottom += legendSize - 20;
}
int angle = or.getAngle();
boolean rotate = angle == 90;
mScale = (float) (height) / width;
mTranslate = Math.abs(width - height) / 2;
if (mScale < 1) {
mTranslate *= -1;
}
mCenter = new Point((x + width) / 2, (y + height) / 2);
if (rotate) {
transform(canvas, angle, false);
}
int maxScaleNumber = -Integer.MAX_VALUE;
for (int i = 0; i < sLength; i++) {
maxScaleNumber = Math.max(maxScaleNumber, mDataset.getSeriesAt(i).getScaleNumber());
}
maxScaleNumber++;
if (maxScaleNumber < 0) {
return;
}
double[] minX = new double[maxScaleNumber];
double[] maxX = new double[maxScaleNumber];
double[] minY = new double[maxScaleNumber];
double[] maxY = new double[maxScaleNumber];
boolean[] isMinXSet = new boolean[maxScaleNumber];
boolean[] isMaxXSet = new boolean[maxScaleNumber];
boolean[] isMinYSet = new boolean[maxScaleNumber];
boolean[] isMaxYSet = new boolean[maxScaleNumber];
for (int i = 0; i < maxScaleNumber; i++) {
minX[i] = mRenderer.getXAxisMin(i);
maxX[i] = mRenderer.getXAxisMax(i);
minY[i] = mRenderer.getYAxisMin(i);
maxY[i] = mRenderer.getYAxisMax(i);
isMinXSet[i] = mRenderer.isMinXSet(i);
isMaxXSet[i] = mRenderer.isMaxXSet(i);
isMinYSet[i] = mRenderer.isMinYSet(i);
isMaxYSet[i] = mRenderer.isMaxYSet(i);
if (mCalcRange.get(i) == null) {
mCalcRange.put(i, new double[4]);
}
}
double[] xPixelsPerUnit = new double[maxScaleNumber];
double[] yPixelsPerUnit = new double[maxScaleNumber];
for (int i = 0; i < sLength; i++) {
XYSeries series = mDataset.getSeriesAt(i);
int scale = series.getScaleNumber();
if (series.getItemCount() == 0) {
continue;
}
if (!isMinXSet[scale]) {
double minimumX = series.getMinX();
minX[scale] = Math.min(minX[scale], minimumX);
mCalcRange.get(scale)[0] = minX[scale];
}
if (!isMaxXSet[scale]) {
double maximumX = series.getMaxX();
maxX[scale] = Math.max(maxX[scale], maximumX);
mCalcRange.get(scale)[1] = maxX[scale];
}
if (!isMinYSet[scale]) {
double minimumY = series.getMinY();
minY[scale] = Math.min(minY[scale], (float) minimumY);
mCalcRange.get(scale)[2] = minY[scale];
}
if (!isMaxYSet[scale]) {
double maximumY = series.getMaxY();
maxY[scale] = Math.max(maxY[scale], (float) maximumY);
mCalcRange.get(scale)[3] = maxY[scale];
}
}
for (int i = 0; i < maxScaleNumber; i++) {
if (maxX[i] - minX[i] != 0) {
xPixelsPerUnit[i] = (right - left) / (maxX[i] - minX[i]);
}
if (maxY[i] - minY[i] != 0) {
yPixelsPerUnit[i] = (float) ((bottom - top) / (maxY[i] - minY[i]));
}
}
if(mRenderer.drawAxesBelowSeries())
drawAxes(canvas, paint, left, top, right, bottom, or, maxScaleNumber);
boolean hasValues = false;
// use a linked list for these reasons:
// 1) Avoid a large contiguous memory allocation
// 2) We don't need random seeking, only sequential reading/writing, so
// linked list makes sense
clickableAreas = new HashMap<Integer, List<RectF>>();
for (int i = 0; i < sLength; i++) {
XYSeries series = mDataset.getSeriesAt(i);
int scale = series.getScaleNumber();
if (series.getItemCount() == 0) {
continue;
}
hasValues = true;
SimpleSeriesRenderer seriesRenderer = mRenderer.getSeriesRendererAt(i);
int originalValuesLength = series.getItemCount();
int valuesLength = originalValuesLength;
int length = valuesLength * 2;
List<Float> points = new ArrayList<Float>();
float yAxisValue = Math.min(bottom, (float) (bottom + yPixelsPerUnit[scale] * minY[scale]));
LinkedList<RectF> clickableArea = new LinkedList<RectF>();
clickableAreas.put(i, clickableArea);
for (int j = 0; j < length; j += 2) {
int index = j / 2;
double yValue = series.getY(index);
if (yValue != MathHelper.NULL_VALUE) {
points.add((float) (left + xPixelsPerUnit[scale] * (series.getX(index) - minX[scale])));
points.add((float) (bottom - yPixelsPerUnit[scale] * (yValue - minY[scale])));
} else if (isRenderNullValues()) {
points.add((float) (left + xPixelsPerUnit[scale] * (series.getX(index) - minX[scale])));
points.add((float) (bottom - yPixelsPerUnit[scale] * (-minY[scale])));
} else {
if (points.size() > 0) {
drawSeries(series, canvas, paint, points, seriesRenderer, yAxisValue, i, or);
RectF[] clickableAreasForSubSeries = clickableAreasForPoints(MathHelper
.getFloats(points), yAxisValue, i);
clickableArea.addAll(Arrays.asList(clickableAreasForSubSeries));
points.clear();
}
clickableArea.add(null);
}
}
if (points.size() > 0) {
drawSeries(series, canvas, paint, points, seriesRenderer, yAxisValue, i, or);
RectF[] clickableAreasForSubSeries = clickableAreasForPoints(MathHelper.getFloats(points),
yAxisValue, i);
clickableArea.addAll(Arrays.asList(clickableAreasForSubSeries));
}
}
// draw stuff over the margins such as data doesn't render on these areas
if(mRenderer.getMarginsColor() != XYMultipleSeriesRenderer.NO_COLOR) {
drawBackground(mRenderer, canvas, x, bottom, width, height - bottom, paint, true, mRenderer
.getMarginsColor());
drawBackground(mRenderer, canvas, x, y, width, margins[0], paint, true, mRenderer
.getMarginsColor());
if (or == Orientation.HORIZONTAL) {
drawBackground(mRenderer, canvas, x, y, left - x, height - y, paint, true, mRenderer
.getMarginsColor());
drawBackground(mRenderer, canvas, right, y, margins[3], height - y, paint, true, mRenderer
.getMarginsColor());
} else if (or == Orientation.VERTICAL) {
drawBackground(mRenderer, canvas, right, y, width - right, height - y, paint, true, mRenderer
.getMarginsColor());
drawBackground(mRenderer, canvas, x, y, left - x, height - y, paint, true, mRenderer
.getMarginsColor());
}
}
boolean showLabels = mRenderer.isShowLabels() && hasValues;
boolean showGrid = mRenderer.isShowGrid();
boolean showCustomTextGrid = mRenderer.isShowCustomTextGrid();
if (showLabels || showGrid) {
List<Double> xLabels = getValidLabels(MathHelper.getLabels(minX[0], maxX[0], mRenderer
.getXLabels()));
Map<Integer, List<Double>> allYLabels = new HashMap<Integer, List<Double>>();
for (int i = 0; i < maxScaleNumber; i++) {
allYLabels.put(i, getValidLabels(MathHelper.getLabels(minY[i], maxY[i], mRenderer
.getYLabels())));
}
int xLabelsLeft = left;
if (showLabels) {
paint.setColor(mRenderer.getLabelsColor());
paint.setTextSize(mRenderer.getLabelsTextSize());
paint.setTextAlign(mRenderer.getXLabelsAlign());
if (mRenderer.getXLabelsAlign() == Align.LEFT) {
xLabelsLeft += mRenderer.getLabelsTextSize() / 4;
}
}
drawXLabels(xLabels, mRenderer.getXTextLabelLocations(), canvas, paint, xLabelsLeft, top,
bottom, xPixelsPerUnit[0], minX[0], maxX[0]);
for (int i = 0; i < maxScaleNumber; i++) {
paint.setTextAlign(mRenderer.getYLabelsAlign(i));
List<Double> yLabels = allYLabels.get(i);
int length = yLabels.size();
for (int j = 0; j < length; j++) {
double label = yLabels.get(j);
Align axisAlign = mRenderer.getYAxisAlign(i);
boolean textLabel = mRenderer.getYTextLabel(label, i) != null;
float yLabel = (float) (bottom - yPixelsPerUnit[i] * (label - minY[i]));
if (or == Orientation.HORIZONTAL) {
if (showLabels && !textLabel) {
paint.setColor(mRenderer.getLabelsColor());
if (axisAlign == Align.LEFT) {
canvas.drawLine(left + getLabelLinePos(axisAlign), yLabel, left, yLabel, paint);
drawText(canvas, getLabel(label), left-5, yLabel+getRenderer().getLabelsTextSize()/2.0f-2, paint, mRenderer
.getYLabelsAngle());
} else {
canvas.drawLine(right, yLabel, right + getLabelLinePos(axisAlign), yLabel, paint);
drawText(canvas, getLabel(label), right, yLabel - 2, paint, mRenderer
.getYLabelsAngle());
}
}
if (showGrid) {
paint.setColor(mRenderer.getGridColor());
canvas.drawLine(left, yLabel, right, yLabel, paint);
}
} else if (or == Orientation.VERTICAL) {
if (showLabels && !textLabel) {
paint.setColor(mRenderer.getLabelsColor());
canvas.drawLine(right - getLabelLinePos(axisAlign), yLabel, right, yLabel, paint);
drawText(canvas, getLabel(label), right + 10, yLabel - 2, paint, mRenderer
.getYLabelsAngle());
}
if (showGrid) {
paint.setColor(mRenderer.getGridColor());
canvas.drawLine(right, yLabel, left, yLabel, paint);
}
}
}
}
if (showLabels && mRenderer.isShowYAxis()) {
paint.setColor(mRenderer.getLabelsColor());
for (int i = 0; i < maxScaleNumber; i++) {
Align axisAlign = mRenderer.getYAxisAlign(i);
Double[] yTextLabelLocations = mRenderer.getYTextLabelLocations(i);
for (Double location : yTextLabelLocations) {
if (minY[i] <= location && location <= maxY[i]) {
float yLabel = (float) (bottom - yPixelsPerUnit[i]
* (location.doubleValue() - minY[i]));
String label = mRenderer.getYTextLabel(location, i);
paint.setColor(mRenderer.getLabelsColor());
if (or == Orientation.HORIZONTAL) {
if (axisAlign == Align.LEFT) {
canvas.drawLine(left + getLabelLinePos(axisAlign), yLabel, left, yLabel, paint);
drawText(canvas, label, left-5, yLabel+getRenderer().getLabelsTextSize()/2.0f-2, paint, mRenderer.getYLabelsAngle());
} else {
canvas.drawLine(right, yLabel, right + getLabelLinePos(axisAlign), yLabel, paint);
drawText(canvas, label, right, yLabel - 2, paint, mRenderer.getYLabelsAngle());
}
if (showCustomTextGrid) {
paint.setColor(mRenderer.getGridColor());
canvas.drawLine(left, yLabel, right, yLabel, paint);
}
} else {
canvas.drawLine(right - getLabelLinePos(axisAlign), yLabel, right, yLabel, paint);
drawText(canvas, label, right + 10, yLabel - 2, paint, mRenderer.getYLabelsAngle());
if (showCustomTextGrid) {
paint.setColor(mRenderer.getGridColor());
canvas.drawLine(right, yLabel, left, yLabel, paint);
}
}
}
}
}
}
if (showLabels) {
paint.setColor(mRenderer.getLabelsColor());
float size = mRenderer.getAxisTitleTextSize();
paint.setTextSize(size);
paint.setTextAlign(Align.CENTER);
if (or == Orientation.HORIZONTAL) {
drawText(canvas, mRenderer.getXTitle(), x + width / 2, bottom
+ mRenderer.getLabelsTextSize() * 4 / 3 + size, paint, 0);
for (int i = 0; i < maxScaleNumber; i++) {
float ycenter = y + height / 2 - mRenderer.getLabelsTextSize();
Align axisAlign = mRenderer.getYAxisAlign(i);
if (axisAlign == Align.LEFT) {
drawText(canvas, mRenderer.getYTitle(i), x + size, ycenter, paint, -90);
} else {
drawText(canvas, mRenderer.getYTitle(i), x + width, ycenter, paint, -90);
}
}
paint.setTextSize(mRenderer.getChartTitleTextSize());
drawText(canvas, mRenderer.getChartTitle(), x + width / 2, y
+ mRenderer.getChartTitleTextSize(), paint, 0);
} else if (or == Orientation.VERTICAL) {
drawText(canvas, mRenderer.getXTitle(), x + width / 2, y + height - size, paint, -90);
drawText(canvas, mRenderer.getYTitle(), right + 20, y + height / 2, paint, 0);
paint.setTextSize(mRenderer.getChartTitleTextSize());
drawText(canvas, mRenderer.getChartTitle(), x + size, top + height / 2, paint, 0);
}
}
}
if (or == Orientation.HORIZONTAL) {
drawLegend(canvas, mRenderer, titles, left, right, y, width, height, legendSize, paint, false);
} else if (or == Orientation.VERTICAL) {
transform(canvas, angle, true);
drawLegend(canvas, mRenderer, titles, left, right, y, width, height, legendSize, paint, false);
transform(canvas, angle, false);
}
if (mRenderer.isShowAverageLines()) {
for(int i=0;i<mDataset.getSeriesCount();i++) {
Paint averageLinePaint = new Paint(paint);
averageLinePaint.setColor(mRenderer.getSeriesRendererAt(i).getColor());
averageLinePaint.setPathEffect(new DashPathEffect(new float[] {3, 3}, 0));
XYSeries series = mDataset.getSeriesAt(i);
int scale = series.getScaleNumber();
Double average = series.getAverageY();
if(average != null) {
Double offset = bottom - yPixelsPerUnit[scale] * (average - minY[i]);
canvas.drawLine(left, offset.intValue(), right, offset.intValue(), averageLinePaint);
}
}
}
if(!mRenderer.drawAxesBelowSeries())
drawAxes(canvas, paint, left, top, right, bottom, or, maxScaleNumber);
if (rotate) {
transform(canvas, angle, true);
}
}
private void drawAxes(Canvas canvas, Paint paint, int left, int top, int right, int bottom,
Orientation or, int maxScaleNumber) {
if (mRenderer.isShowAxes()) {
paint.setColor(mRenderer.getAxesColor());
canvas.drawLine(left, bottom, right, bottom, paint);
if(mRenderer.isShowYAxis()) {
boolean rightAxis = false;
for (int i = 0; i < maxScaleNumber && !rightAxis; i++) {
rightAxis = mRenderer.getYAxisAlign(i) == Align.RIGHT;
}
if (or == Orientation.HORIZONTAL) {
canvas.drawLine(left, top, left, bottom, paint);
if (rightAxis) {
canvas.drawLine(right, top, right, bottom, paint);
}
} else if (or == Orientation.VERTICAL) {
canvas.drawLine(right, top, right, bottom, paint);
}
}
}
}
protected Rect getScreenR() {
return mScreenR;
}
protected void setScreenR(Rect screenR) {
mScreenR = screenR;
}
private List<Double> getValidLabels(List<Double> labels) {
List<Double> result = new ArrayList<Double>(labels);
for (Double label : labels) {
if (label.isNaN()) {
result.remove(label);
}
}
return result;
}
protected void drawSeries(XYSeries series, Canvas canvas, Paint paint, List<Float> pointsList,
SimpleSeriesRenderer seriesRenderer, float yAxisValue, int seriesIndex, Orientation or) {
BasicStroke stroke = seriesRenderer.getStroke();
Cap cap = paint.getStrokeCap();
Join join = paint.getStrokeJoin();
float miter = paint.getStrokeMiter();
PathEffect pathEffect = paint.getPathEffect();
Style style = paint.getStyle();
if (stroke != null) {
PathEffect effect = null;
if (stroke.getIntervals() != null) {
effect = new DashPathEffect(stroke.getIntervals(), stroke.getPhase());
}
setStroke(stroke.getCap(), stroke.getJoin(), stroke.getMiter(), Style.FILL_AND_STROKE,
effect, paint);
}
float[] points = MathHelper.getFloats(pointsList);
drawSeries(canvas, paint, points, seriesRenderer, yAxisValue, seriesIndex);
if (isRenderPoints(seriesRenderer)) {
ScatterChart pointsChart = getPointsChart();
if (pointsChart != null) {
pointsChart.drawSeries(canvas, paint, points, seriesRenderer, yAxisValue, seriesIndex);
}
}
paint.setTextSize(seriesRenderer.getChartValuesTextSize());
if (or == Orientation.HORIZONTAL) {
paint.setTextAlign(Align.CENTER);
} else {
paint.setTextAlign(Align.LEFT);
}
if (seriesRenderer.isDisplayChartValues()) {
paint.setTextAlign(seriesRenderer.getChartValuesTextAlign());
drawChartValuesText(canvas, series, seriesRenderer, paint, points, seriesIndex);
}
if (stroke != null) {
setStroke(cap, join, miter, style, pathEffect, paint);
}
}
private void setStroke(Cap cap, Join join, float miter, Style style, PathEffect pathEffect,
Paint paint) {
paint.setStrokeCap(cap);
paint.setStrokeJoin(join);
paint.setStrokeMiter(miter);
paint.setPathEffect(pathEffect);
paint.setStyle(style);
}
/**
* The graphical representation of the series values as text.
*
* @param canvas the canvas to paint to
* @param series the series to be painted
* @param renderer the series renderer
* @param paint the paint to be used for drawing
* @param points the array of points to be used for drawing the series
* @param seriesIndex the index of the series currently being drawn
*/
protected void drawChartValuesText(Canvas canvas, XYSeries series, SimpleSeriesRenderer renderer,
Paint paint, float[] points, int seriesIndex) {
for (int k = 0; k < points.length; k += 2) {
drawText(canvas, getLabel(series.getY(k / 2)), points[k], points[k + 1]
- renderer.getChartValuesSpacing(), paint, 0);
}
}
/**
* The graphical representation of a text, to handle both HORIZONTAL and
* VERTICAL orientations and extra rotation angles.
*
* @param canvas the canvas to paint to
* @param text the text to be rendered
* @param x the X axis location of the text
* @param y the Y axis location of the text
* @param paint the paint to be used for drawing
* @param extraAngle the text angle
*/
public void drawText(Canvas canvas, String text, float x, float y, Paint paint,
float extraAngle) {
float angle = -mRenderer.getOrientation().getAngle() + extraAngle;
if (angle != 0) {
// canvas.scale(1 / mScale, mScale);
canvas.rotate(angle, x, y);
}
canvas.drawText(text, x, y, paint);
if (angle != 0) {
canvas.rotate(-angle, x, y);
// canvas.scale(mScale, 1 / mScale);
}
}
/**
* Transform the canvas such as it can handle both HORIZONTAL and VERTICAL
* orientations.
*
* @param canvas the canvas to paint to
* @param angle the angle of rotation
* @param inverse if the inverse transform needs to be applied
*/
private void transform(Canvas canvas, float angle, boolean inverse) {
if (inverse) {
canvas.scale(1 / mScale, mScale);
canvas.translate(mTranslate, -mTranslate);
canvas.rotate(-angle, mCenter.getX(), mCenter.getY());
} else {
canvas.rotate(angle, mCenter.getX(), mCenter.getY());
canvas.translate(-mTranslate, mTranslate);
canvas.scale(mScale, 1 / mScale);
}
}
/**
* Makes sure the fraction digit is not displayed, if not needed.
*
* @param label the input label value
* @return the label without the useless fraction digit
*/
public String getLabel(double label) {
String text = "";
if (label == Math.round(label)) {
text = Math.round(label) + "";
} else {
text = label + "";
}
return text;
}
/**
* The graphical representation of the labels on the X axis.
*
* @param xLabels the X labels values
* @param xTextLabelLocations the X text label locations
* @param canvas the canvas to paint to
* @param paint the paint to be used for drawing
* @param left the left value of the labels area
* @param top the top value of the labels area
* @param bottom the bottom value of the labels area
* @param xPixelsPerUnit the amount of pixels per one unit in the chart labels
* @param minX the minimum value on the X axis in the chart
* @param maxX the maximum value on the X axis in the chart
*/
protected void drawXLabels(List<Double> xLabels, Double[] xTextLabelLocations, Canvas canvas,
Paint paint, int left, int top, int bottom, double xPixelsPerUnit, double minX, double maxX) {
int length = xLabels.size();
boolean showLabels = mRenderer.isShowLabels();
boolean showGrid = mRenderer.isShowGrid();
for (int i = 0; i < length; i++) {
double label = xLabels.get(i);
float xLabel = (float) (left + xPixelsPerUnit * (label - minX));
if (showLabels && mRenderer.getXTextLabel(label) == null) {
paint.setColor(mRenderer.getLabelsColor());
canvas.drawLine(xLabel, bottom, xLabel, bottom + mRenderer.getLabelsTextSize() / 3, paint);
drawText(canvas, getLabel(label), xLabel, bottom + mRenderer.getLabelsTextSize() * 4 / 3,
paint, mRenderer.getXLabelsAngle());
}
if (showGrid) {
paint.setColor(mRenderer.getGridColor());
canvas.drawLine(xLabel, bottom, xLabel, top, paint);
}
}
drawXTextLabels(xTextLabelLocations, canvas, paint, showLabels, left, top, bottom, xPixelsPerUnit, minX, maxX);
}
/**
* The graphical representation of the text labels on the X axis.
*
* @param xTextLabelLocations the X text label locations
* @param canvas the canvas to paint to
* @param paint the paint to be used for drawing
* @param left the left value of the labels area
* @param top the top value of the labels area
* @param bottom the bottom value of the labels area
* @param xPixelsPerUnit the amount of pixels per one unit in the chart labels
* @param minX the minimum value on the X axis in the chart
* @param maxX the maximum value on the X axis in the chart
*/
public void drawXTextLabels(Double[] xTextLabelLocations, Canvas canvas, Paint paint,
boolean showLabels, int left, int top, int bottom, double xPixelsPerUnit, double minX, double maxX) {
boolean showCustomTextGrid = mRenderer.isShowCustomTextGrid();
if (showLabels) {
paint.setColor(mRenderer.getLabelsColor());
for (Double location : xTextLabelLocations) {
if (minX <= location && location <= maxX) {
float xLabel = (float) (left + xPixelsPerUnit * (location.doubleValue() - minX));
paint.setColor(mRenderer.getLabelsColor());
canvas.drawLine(xLabel, bottom, xLabel, bottom + mRenderer.getLabelsTextSize() / 2, paint);
drawText(canvas, mRenderer.getXTextLabel(location), xLabel, bottom
+ mRenderer.getLabelsTextSize() * 3 / 2 + 2, paint, mRenderer.getXLabelsAngle());
if (showCustomTextGrid) {
paint.setColor(mRenderer.getGridColor());
canvas.drawLine(xLabel, bottom, xLabel, top, paint);
}
}
}
}
}
// TODO: docs
public XYMultipleSeriesRenderer getRenderer() {
return mRenderer;
}
public XYMultipleSeriesDataset getDataset() {
return mDataset;
}
public double[] getCalcRange(int scale) {
return mCalcRange.get(scale);
}
public void setCalcRange(double[] range, int scale) {
mCalcRange.put(scale, range);
}
public double[] toRealPoint(float screenX, float screenY) {
return toRealPoint(screenX, screenY, 0);
}
public double[] toScreenPoint(double[] realPoint) {
return toScreenPoint(realPoint, 0);
}
private int getLabelLinePos(Align align) {
int pos = 4;
if (align == Align.LEFT) {
pos = -pos;
}
return pos;
}
/**
* Transforms a screen point to a real coordinates point.
*
* @param screenX the screen x axis value
* @param screenY the screen y axis value
* @return the real coordinates point
*/
public double[] toRealPoint(float screenX, float screenY, int scale) {
double realMinX = mRenderer.getXAxisMin(scale);
double realMaxX = mRenderer.getXAxisMax(scale);
double realMinY = mRenderer.getYAxisMin(scale);
double realMaxY = mRenderer.getYAxisMax(scale);
return new double[] {
(screenX - mScreenR.left) * (realMaxX - realMinX) / mScreenR.width() + realMinX,
(mScreenR.top + mScreenR.height() - screenY) * (realMaxY - realMinY) / mScreenR.height()
+ realMinY };
}
public double[] toScreenPoint(double[] realPoint, int scale) {
double realMinX = mRenderer.getXAxisMin(scale);
double realMaxX = mRenderer.getXAxisMax(scale);
double realMinY = mRenderer.getYAxisMin(scale);
double realMaxY = mRenderer.getYAxisMax(scale);
if (!mRenderer.isMinXSet(scale) || !mRenderer.isMaxXSet(scale) || !mRenderer.isMinXSet(scale)
|| !mRenderer.isMaxYSet(scale)) {
double[] calcRange = getCalcRange(scale);
realMinX = calcRange[0];
realMaxX = calcRange[1];
realMinY = calcRange[2];
realMaxY = calcRange[3];
}
return new double[] {
(realPoint[0] - realMinX) * mScreenR.width() / (realMaxX - realMinX) + mScreenR.left,
(realMaxY - realPoint[1]) * mScreenR.height() / (realMaxY - realMinY) + mScreenR.top };
}
@Override
public SeriesSelection getSeriesAndPointForScreenCoordinate(final Point screenPoint) {
if (clickableAreas != null)
for (int seriesIndex = clickableAreas.size() - 1; seriesIndex >= 0; seriesIndex--) {
// series 0 is drawn first. Then series 1 is drawn on top, and series 2
// on top of that.
// we want to know what the user clicked on, so traverse them in the
// order they appear on the screen.
int pointIndex = 0;
if (clickableAreas.get(seriesIndex) != null) {
for (RectF rect : clickableAreas.get(seriesIndex)) {
if (rect != null && rect.contains(screenPoint.getX(), screenPoint.getY())) {
XYSeries series = mDataset.getSeriesAt(seriesIndex);
return new SeriesSelection(seriesIndex, pointIndex, series.getX(pointIndex), series.getY(pointIndex));
}
pointIndex++;
}
}
}
return super.getSeriesAndPointForScreenCoordinate(screenPoint);
}
/**
* The graphical representation of a series.
*
* @param canvas the canvas to paint to
* @param paint the paint to be used for drawing
* @param points the array of points to be used for drawing the series
* @param seriesRenderer the series renderer
* @param yAxisValue the minimum value of the y axis
* @param seriesIndex the index of the series currently being drawn
*/
public abstract void drawSeries(Canvas canvas, Paint paint, float[] points,
SimpleSeriesRenderer seriesRenderer, float yAxisValue, int seriesIndex);
/**
* Returns the clickable areas for all passed points
*
* @param points the array of points
* @param yAxisValue the minimum value of the y axis
* @param seriesIndex the index of the series to which the points belong
* @return an array of rectangles with the clickable area
*/
protected abstract RectF[] clickableAreasForPoints(float[] points, float yAxisValue,
int seriesIndex);
/**
* Returns if the chart should display the null values.
*
* @return if null values should be rendered
*/
protected boolean isRenderNullValues() {
return false;
}
/**
* Returns if the chart should display the points as a certain shape.
*
* @param renderer the series renderer
*/
public boolean isRenderPoints(SimpleSeriesRenderer renderer) {
return false;
}
/**
* Returns the default axis minimum.
*
* @return the default axis minimum
*/
public double getDefaultMinimum() {
return MathHelper.NULL_VALUE;
}
/**
* Returns the scatter chart to be used for drawing the data points.
*
* @return the data points scatter chart
*/
public ScatterChart getPointsChart() {
return null;
}
/**
* Returns the chart type identifier.
*
* @return the chart type
*/
public abstract String getChartType();
public View getLegendView(Context context) {
View v = new View(context) {
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int height = mRenderer.getLegendHeight();
setMeasuredDimension(getMeasuredWidth(), height);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
draw(canvas, 0, 0, getMeasuredWidth(), getMeasuredHeight());
}
public void draw(Canvas canvas, int x, int y, int width, int height) {
Paint paint = new Paint();
paint.setAntiAlias(mRenderer.isAntialiasing());
int left = x;
int right = x + width;
int sLength = mDataset.getSeriesCount();
String[] titles = new String[sLength];
for (int i = 0; i < sLength; i++) {
titles[i] = mDataset.getSeriesAt(i).getTitle();
}
boolean oldShowLegend = mRenderer.isShowLegend();
mRenderer.setShowLegend(true);
drawLegend(canvas, mRenderer, titles, left, right, y, width, height, height,
paint, false);
mRenderer.setShowLegend(oldShowLegend);
}
};
return v;
}
}