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/** * Copyright (C) 2009 - 2012 SC 4ViewSoft SRL * // w w w.ja v a 2 s. c o m * 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 org.achartengine.model.XYMultipleSeriesDataset; import org.achartengine.model.XYSeries; import org.achartengine.renderer.SimpleSeriesRenderer; import org.achartengine.renderer.XYMultipleSeriesRenderer; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Paint.Style; import android.graphics.RectF; import android.graphics.drawable.GradientDrawable; import android.graphics.drawable.GradientDrawable.Orientation; /** * The bar chart rendering class. */ public class BarChart extends XYChart { /** The constant to identify this chart type. */ public static final String TYPE = "Bar"; /** The legend shape width. */ private static final int SHAPE_WIDTH = 12; /** The chart type. */ protected Type mType = Type.DEFAULT; /** * The bar chart type enum. */ public enum Type { DEFAULT, STACKED; } BarChart() { } BarChart(Type type) { mType = type; } /** * Builds a new bar chart instance. * * @param dataset the multiple series dataset * @param renderer the multiple series renderer * @param type the bar chart type */ public BarChart(XYMultipleSeriesDataset dataset, XYMultipleSeriesRenderer renderer, Type type) { super(dataset, renderer); mType = type; } @Override protected ClickableArea[] clickableAreasForPoints(float[] points, double[] values, float yAxisValue, int seriesIndex, int startIndex) { int seriesNr = mDataset.getSeriesCount(); int length = points.length; ClickableArea[] ret = new ClickableArea[length / 2]; float halfDiffX = getHalfDiffX(points, length, seriesNr); for (int i = 0; i < length; i += 2) { float x = points[i]; float y = points[i + 1]; if (mType == Type.STACKED) { ret[i / 2] = new ClickableArea(new RectF(x - halfDiffX, y, x + halfDiffX, yAxisValue), values[i], values[i + 1]); } else { float startX = x - seriesNr * halfDiffX + seriesIndex * 2 * halfDiffX; ret[i / 2] = new ClickableArea(new RectF(startX, y, startX + 2 * halfDiffX, yAxisValue), values[i], values[i + 1]); } } return ret; } /** * 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 * @param startIndex the start index of the rendering points */ public void drawSeries(Canvas canvas, Paint paint, float[] points, SimpleSeriesRenderer seriesRenderer, float yAxisValue, int seriesIndex, int startIndex) { int seriesNr = mDataset.getSeriesCount(); int length = points.length; paint.setColor(seriesRenderer.getColor()); paint.setStyle(Style.FILL); float halfDiffX = getHalfDiffX(points, length, seriesNr); for (int i = 0; i < length; i += 2) { float x = points[i]; float y = points[i + 1]; drawBar(canvas, x, yAxisValue, x, y, halfDiffX, seriesNr, seriesIndex, paint); } paint.setColor(seriesRenderer.getColor()); } /** * Draws a bar. * * @param canvas the canvas * @param xMin the X axis minimum * @param yMin the Y axis minimum * @param xMax the X axis maximum * @param yMax the Y axis maximum * @param halfDiffX half the size of a bar * @param seriesNr the total number of series * @param seriesIndex the current series index * @param paint the paint */ protected void drawBar(Canvas canvas, float xMin, float yMin, float xMax, float yMax, float halfDiffX, int seriesNr, int seriesIndex, Paint paint) { int scale = mDataset.getSeriesAt(seriesIndex).getScaleNumber(); if (mType == Type.STACKED) { drawBar(canvas, xMin - halfDiffX, yMax, xMax + halfDiffX, yMin, scale, seriesIndex, paint); } else { float startX = xMin - seriesNr * halfDiffX + seriesIndex * 2 * halfDiffX; drawBar(canvas, startX, yMax, startX + 2 * halfDiffX, yMin, scale, seriesIndex, paint); } } /** * Draws a bar. * * @param canvas the canvas * @param xMin the X axis minimum * @param yMin the Y axis minimum * @param xMax the X axis maximum * @param yMax the Y axis maximum * @param scale the scale index * @param seriesIndex the current series index * @param paint the paint */ private void drawBar(Canvas canvas, float xMin, float yMin, float xMax, float yMax, int scale, int seriesIndex, Paint paint) { SimpleSeriesRenderer renderer = mRenderer.getSeriesRendererAt(seriesIndex); if (renderer.isGradientEnabled()) { float minY = (float) toScreenPoint(new double[] { 0, renderer.getGradientStopValue() }, scale)[1]; float maxY = (float) toScreenPoint(new double[] { 0, renderer.getGradientStartValue() }, scale)[1]; float gradientMinY = Math.max(minY, Math.min(yMin, yMax)); float gradientMaxY = Math.min(maxY, Math.max(yMin, yMax)); int gradientMinColor = renderer.getGradientStopColor(); int gradientMaxColor = renderer.getGradientStartColor(); int gradientStartColor = gradientMaxColor; int gradientStopColor = gradientMinColor; if (yMin < minY) { paint.setColor(gradientMinColor); canvas.drawRect(Math.round(xMin), Math.round(yMin), Math.round(xMax), Math.round(gradientMinY), paint); } else { gradientStopColor = getGradientPartialColor(gradientMinColor, gradientMaxColor, (maxY - gradientMinY) / (maxY - minY)); } if (yMax > maxY) { paint.setColor(gradientMaxColor); canvas.drawRect(Math.round(xMin), Math.round(gradientMaxY), Math.round(xMax), Math.round(yMax), paint); } else { gradientStartColor = getGradientPartialColor(gradientMaxColor, gradientMinColor, (gradientMaxY - minY) / (maxY - minY)); } GradientDrawable gradient = new GradientDrawable(Orientation.BOTTOM_TOP, new int[] { gradientStartColor, gradientStopColor }); gradient.setBounds(Math.round(xMin), Math.round(gradientMinY), Math.round(xMax), Math.round(gradientMaxY)); gradient.draw(canvas); } else { if (Math.abs(yMin - yMax) < 1) { if (yMin < yMax) { yMax = yMin + 1; } else { yMax = yMin - 1; } } canvas .drawRect(Math.round(xMin), Math.round(yMin), Math.round(xMax), Math.round(yMax), paint); } } private int getGradientPartialColor(int minColor, int maxColor, float fraction) { int alpha = Math.round(fraction * Color.alpha(minColor) + (1 - fraction) * Color.alpha(maxColor)); int r = Math.round(fraction * Color.red(minColor) + (1 - fraction) * Color.red(maxColor)); int g = Math.round(fraction * Color.green(minColor) + (1 - fraction) * Color.green(maxColor)); int b = Math.round(fraction * Color.blue(minColor) + (1 - fraction) * Color.blue((maxColor))); return Color.argb(alpha, r, g, b); } /** * 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 * @param startIndex the start index of the rendering points */ protected void drawChartValuesText(Canvas canvas, XYSeries series, SimpleSeriesRenderer renderer, Paint paint, float[] points, int seriesIndex, int startIndex) { int seriesNr = mDataset.getSeriesCount(); float halfDiffX = getHalfDiffX(points, points.length, seriesNr); for (int i = 0; i < points.length; i += 2) { int index = startIndex + i / 2; double value = series.getY(index); if (!isNullValue(value)) { float x = points[i]; if (mType == Type.DEFAULT) { x += seriesIndex * 2 * halfDiffX - (seriesNr - 1.5f) * halfDiffX; } if (value >= 0) { drawText(canvas, getLabel(value), x, points[i + 1] - renderer.getChartValuesSpacing(), paint, 0); } else { drawText(canvas, getLabel(value), x, points[i + 1] + renderer.getChartValuesTextSize() + renderer.getChartValuesSpacing() - 3, paint, 0); } } } } /** * Returns the legend shape width. * * @param seriesIndex the series index * @return the legend shape width */ public int getLegendShapeWidth(int seriesIndex) { return SHAPE_WIDTH; } /** * The graphical representation of the legend shape. * * @param canvas the canvas to paint to * @param renderer the series renderer * @param x the x value of the point the shape should be drawn at * @param y the y value of the point the shape should be drawn at * @param seriesIndex the series index * @param paint the paint to be used for drawing */ public void drawLegendShape(Canvas canvas, SimpleSeriesRenderer renderer, float x, float y, int seriesIndex, Paint paint) { float halfShapeWidth = SHAPE_WIDTH / 2; canvas.drawRect(x, y - halfShapeWidth, x + SHAPE_WIDTH, y + halfShapeWidth, paint); } /** * Calculates and returns the half-distance in the graphical representation of * 2 consecutive points. * * @param points the points * @param length the points length * @param seriesNr the series number * @return the calculated half-distance value */ protected float getHalfDiffX(float[] points, int length, int seriesNr) { int div = length; if (length > 2) { div = length - 2; } float halfDiffX = (points[length - 2] - points[0]) / div; if (halfDiffX == 0) { halfDiffX = 10; } if (mType != Type.STACKED) { halfDiffX /= seriesNr; } return (float) (halfDiffX / (getCoeficient() * (1 + mRenderer.getBarSpacing()))); } /** * Returns the value of a constant used to calculate the half-distance. * * @return the constant value */ protected float getCoeficient() { return 1f; } /** * Returns if the chart should display the null values. * * @return if null values should be rendered */ protected boolean isRenderNullValues() { return true; } /** * Returns the default axis minimum. * * @return the default axis minimum */ public double getDefaultMinimum() { return 0; } /** * Returns the chart type identifier. * * @return the chart type */ public String getChartType() { return TYPE; } }