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/**
* Copyright (C) 2009 - 2013 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 com.codename1.charts.views;
import java.util.ArrayList;
import java.util.List;
import com.codename1.charts.compat.Canvas;
import com.codename1.charts.compat.Paint;
import com.codename1.charts.compat.Paint.Style;
import com.codename1.charts.models.XYMultipleSeriesDataset;
import com.codename1.charts.renderers.SimpleSeriesRenderer;
import com.codename1.charts.renderers.XYMultipleSeriesRenderer;
import com.codename1.charts.renderers.XYSeriesRenderer;
import com.codename1.charts.renderers.XYSeriesRenderer.FillOutsideLine;
/**
* The line chart rendering class.
*/
public class LineChart extends XYChart {
/** The constant to identify this chart type. */
public static final String TYPE = "Line";
/** The legend shape width. */
private static final int SHAPE_WIDTH = 30;
/** The scatter chart to be used to draw the data points. */
private ScatterChart pointsChart;
LineChart() {
}
/**
* Builds a new line chart instance.
*
* @param dataset the multiple series dataset
* @param renderer the multiple series renderer
*/
public LineChart(XYMultipleSeriesDataset dataset, XYMultipleSeriesRenderer renderer) {
super(dataset, renderer);
pointsChart = new ScatterChart(dataset, renderer);
}
/**
* Sets the series and the renderer.
*
* @param dataset the series dataset
* @param renderer the series renderer
*/
protected void setDatasetRenderer(XYMultipleSeriesDataset dataset,
XYMultipleSeriesRenderer renderer) {
super.setDatasetRenderer(dataset, renderer);
pointsChart = new ScatterChart(dataset, renderer);
}
/**
* 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
*/
@Override
public void drawSeries(Canvas canvas, Paint paint, List points, XYSeriesRenderer renderer,
float yAxisValue, int seriesIndex, int startIndex) {
float lineWidth = paint.getStrokeWidth();
paint.setStrokeWidth(renderer.getLineWidth());
final FillOutsideLine[] fillOutsideLine = renderer.getFillOutsideLine();
for (FillOutsideLine fill : fillOutsideLine) {
if (fill.getType() != FillOutsideLine.Type.NONE) {
paint.setColor(fill.getColor());
// TODO: find a way to do area charts without duplicating data
List fillPoints = new ArrayList();
int[] range = fill.getFillRange();
if (range == null) {
fillPoints.addAll(points);
} else {
if (points.size() > range[0] * 2 && points.size() > range[1] * 2) {
fillPoints.addAll(points.subList(range[0] * 2, range[1] * 2));
}
}
final float referencePoint;
// switch on ENUM's generates reflection code that screws up J2ME
FillOutsideLine.Type tt = fill.getType();
if(tt == FillOutsideLine.Type.BOUNDS_ALL || tt == FillOutsideLine.Type.BOUNDS_BELOW || tt == FillOutsideLine.Type.BOUNDS_ABOVE) {
referencePoint = yAxisValue;
} else {
if(tt == FillOutsideLine.Type.BELOW) {
referencePoint = canvas.getHeight();
} else {
if(tt == FillOutsideLine.Type.ABOVE) {
referencePoint = 0;
} else {
throw new RuntimeException(
"You have added a new type of filling but have not implemented.");
}
}
}
/*switch (fill.getType()) {
case BOUNDS_ALL:
referencePoint = yAxisValue;
break;
case BOUNDS_BELOW:
referencePoint = yAxisValue;
break;
case BOUNDS_ABOVE:
referencePoint = yAxisValue;
break;
case BELOW:
referencePoint = canvas.getHeight();
break;
case ABOVE:
referencePoint = 0;
break;
default:
throw new RuntimeException(
"You have added a new type of filling but have not implemented.");
}*/
if (fill.getType() == FillOutsideLine.Type.BOUNDS_ABOVE
|| fill.getType() == FillOutsideLine.Type.BOUNDS_BELOW) {
List boundsPoints = new ArrayList();
boolean add = false;
int length = fillPoints.size();
if (length > 0 && fill.getType() == FillOutsideLine.Type.BOUNDS_ABOVE
&& fillPoints.get(1) < referencePoint
|| fill.getType() == FillOutsideLine.Type.BOUNDS_BELOW
&& fillPoints.get(1) > referencePoint) {
boundsPoints.add(fillPoints.get(0));
boundsPoints.add(fillPoints.get(1));
add = true;
}
for (int i = 3; i < length; i += 2) {
float prevValue = fillPoints.get(i - 2);
float value = fillPoints.get(i);
if (prevValue < referencePoint && value > referencePoint || prevValue > referencePoint
&& value < referencePoint) {
float prevX = fillPoints.get(i - 3);
float x = fillPoints.get(i - 1);
boundsPoints.add(prevX + (x - prevX) * (referencePoint - prevValue)
/ (value - prevValue));
boundsPoints.add(referencePoint);
if (fill.getType() == FillOutsideLine.Type.BOUNDS_ABOVE && value > referencePoint
|| fill.getType() == FillOutsideLine.Type.BOUNDS_BELOW && value < referencePoint) {
i += 2;
add = false;
} else {
boundsPoints.add(x);
boundsPoints.add(value);
add = true;
}
} else {
if (add || fill.getType() == FillOutsideLine.Type.BOUNDS_ABOVE
&& value < referencePoint || fill.getType() == FillOutsideLine.Type.BOUNDS_BELOW
&& value > referencePoint) {
boundsPoints.add(fillPoints.get(i - 1));
boundsPoints.add(value);
}
}
}
fillPoints.clear();
fillPoints.addAll(boundsPoints);
}
int length = fillPoints.size();
if (length > 0) {
fillPoints.set(0, fillPoints.get(0) + 1);
fillPoints.add(fillPoints.get(length - 2));
fillPoints.add(referencePoint);
fillPoints.add(fillPoints.get(0));
fillPoints.add(fillPoints.get(length + 1));
for (int i = 0; i < length + 4; i += 2) {
if (fillPoints.get(i + 1) < 0) {
fillPoints.set(i + 1, 0f);
}
}
paint.setStyle(Style.FILL);
drawPath(canvas, fillPoints, paint, true);
}
}
}
paint.setColor(renderer.getColor());
paint.setStyle(Style.STROKE);
drawPath(canvas, points, paint, false);
paint.setStrokeWidth(lineWidth);
}
@Override
protected ClickableArea[] clickableAreasForPoints(List points, List values,
float yAxisValue, int seriesIndex, int startIndex) {
int length = points.size();
ClickableArea[] ret = new ClickableArea[length / 2];
for (int i = 0; i < length; i += 2) {
int selectableBuffer = mRenderer.getSelectableBuffer();
ret[i / 2] = new ClickableArea(PkgUtils.makeRect(points.get(i) - selectableBuffer, points.get(i + 1)
- selectableBuffer, points.get(i) + selectableBuffer, points.get(i + 1)
+ selectableBuffer), values.get(i), values.get(i + 1));
}
return ret;
}
/**
* 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) {
canvas.drawLine(x, y, x + SHAPE_WIDTH, y, paint);
if (isRenderPoints(renderer)) {
pointsChart.drawLegendShape(canvas, renderer, x + 5, y, seriesIndex, paint);
}
}
/**
* Returns if the chart should display the points as a certain shape.
*
* @param renderer the series renderer
*/
public boolean isRenderPoints(SimpleSeriesRenderer renderer) {
return ((XYSeriesRenderer) renderer).getPointStyle() != PointStyle.POINT;
}
/**
* Returns the scatter chart to be used for drawing the data points.
*
* @return the data points scatter chart
*/
public ScatterChart getPointsChart() {
return pointsChart;
}
/**
* Returns the chart type identifier.
*
* @return the chart type
*/
public String getChartType() {
return TYPE;
}
}
