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plotting

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serso 2011-12-05 00:17:16 +04:00
parent 49a59d5852
commit 75b4d1adc7
1 changed files with 88 additions and 31 deletions
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119
src/main/java/org/solovyev/android/calculator/CalculatorPlotActivity.java
View File

@ -10,6 +10,7 @@ import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.ViewGroup;
import android.view.Window;
import android.widget.Toast;
@ -27,7 +28,6 @@ import org.achartengine.GraphicalView;
import org.achartengine.chart.LineChart;
import org.achartengine.chart.PointStyle;
import org.achartengine.chart.XYChart;
import org.achartengine.model.Point;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.model.XYSeries;
import org.achartengine.renderer.BasicStroke;
@ -118,10 +118,26 @@ public class CalculatorPlotActivity extends Activity {
final XYChart chart = prepareChart(minValue, maxValue, expression, variable);
// reverting boundaries (as in prepareChart() we add some cached values )
chart.getRenderer().setXAxisMin(DEFAULT_MIN_NUMBER);
chart.getRenderer().setYAxisMin(DEFAULT_MIN_NUMBER);
chart.getRenderer().setXAxisMax(DEFAULT_MAX_NUMBER);
chart.getRenderer().setYAxisMax(DEFAULT_MAX_NUMBER);
double minX = Double.MAX_VALUE;
double minY = Double.MAX_VALUE;
double maxX = Double.MIN_VALUE;
double maxY = Double.MIN_VALUE;
for (XYSeries series : chart.getDataset().getSeries()) {
minX = Math.min(minX, series.getMinX());
minY = Math.min(minY, series.getMinY());
maxX = Math.max(maxX, series.getMaxX());
maxY = Math.max(maxY, series.getMaxY());
}
Log.d(CalculatorPlotActivity.class.getName(), "min x: " +minX +", min y: " + minY + ", max x: " + maxX + ", max y: " + maxY);
chart.getRenderer().setXAxisMin(Math.max(minX, DEFAULT_MIN_NUMBER));
chart.getRenderer().setYAxisMin(Math.max(minY, DEFAULT_MIN_NUMBER));
chart.getRenderer().setXAxisMax(Math.min(maxX, DEFAULT_MAX_NUMBER));
chart.getRenderer().setYAxisMax(Math.min(maxY, DEFAULT_MAX_NUMBER));
graphicalView = new GraphicalView(this, chart);
graphicalView.addZoomListener(new ZoomListener() {
@Override
@ -143,6 +159,8 @@ public class CalculatorPlotActivity extends Activity {
});
graphContainer.addView(graphicalView);
updateDataSets(chart);
}
private void updateDataSets(@NotNull final XYChart chart) {
@ -163,11 +181,11 @@ public class CalculatorPlotActivity extends Activity {
if (chart.getDataset().getSeriesCount() > 1) {
imagSeries = chart.getDataset().getSeriesAt(1);
} else {
imagSeries = new XYSeries(getImagFunctionName(CalculatorPlotActivity.this.expression, CalculatorPlotActivity.this.variable));
imagSeries = new XYSeries(getImagFunctionName(CalculatorPlotActivity.this.variable));
}
try {
if (addXY(dr.getXAxisMin(), dr.getXAxisMax(), expression, variable, realSeries, imagSeries)) {
if (addXY(dr.getXAxisMin(), dr.getXAxisMax(), expression, variable, realSeries, imagSeries, true)) {
if (chart.getDataset().getSeriesCount() <= 1) {
chart.getDataset().addSeries(imagSeries);
chart.getRenderer().addSeriesRenderer(createImagRenderer());
@ -192,8 +210,8 @@ public class CalculatorPlotActivity extends Activity {
}
@NotNull
private static String getImagFunctionName(@NotNull Generic expression, @NotNull Constant variable) {
return "g(" + variable.getName() +")" + " = " + "Im(" + expression.toString() + ")";
private static String getImagFunctionName(@NotNull Constant variable) {
return "g(" + variable.getName() +")" + " = " + "Im(ƒ(" + variable.getName() +"))";
}
@NotNull
@ -206,9 +224,9 @@ public class CalculatorPlotActivity extends Activity {
private static XYChart prepareChart(final double minValue, final double maxValue, @NotNull final Generic expression, @NotNull final Constant variable) {
final XYSeries realSeries = new XYSeries(getRealFunctionName(expression, variable));
final XYSeries imagSeries = new XYSeries(getImagFunctionName(expression, variable));
final XYSeries imagSeries = new XYSeries(getImagFunctionName(variable));
boolean imagExists = addXY(minValue, maxValue, expression, variable, realSeries, imagSeries);
boolean imagExists = addXY(minValue, maxValue, expression, variable, realSeries, imagSeries, false);
final XYMultipleSeriesDataset data = new XYMultipleSeriesDataset();
data.addSeries(realSeries);
@ -233,18 +251,20 @@ public class CalculatorPlotActivity extends Activity {
private static XYSeriesRenderer createImagRenderer() {
final XYSeriesRenderer imagRenderer = createCommonRenderer();
imagRenderer.setStroke(BasicStroke.DASHED);
imagRenderer.setColor(Color.DKGRAY);
imagRenderer.setColor(Color.LTGRAY);
return imagRenderer;
}
private static boolean addXY(double minValue, double maxValue, Generic expression, Constant variable, @NotNull XYSeries realSeries, @NotNull XYSeries imagSeries) {
private static boolean addXY(double minValue, double maxValue, Generic expression, Constant variable, @NotNull XYSeries realSeries, @NotNull XYSeries imagSeries, boolean addExtra) {
boolean imagExists = false;
double min = Math.min(minValue, maxValue);
double max = Math.max(minValue, maxValue);
double dist = max - min;
min = min - dist;
max = max + dist;
if (addExtra) {
min = min - dist;
max = max + dist;
}
final int numberOfSteps = DEFAULT_NUMBER_OF_STEPS;
final double step = Math.max((max - min) / numberOfSteps, 0.000000001);
@ -252,8 +272,8 @@ public class CalculatorPlotActivity extends Activity {
Double prevRealY = null;
Double prevX = null;
Double prevImagY = null;
double maxY = Double.NEGATIVE_INFINITY;
double minY = Double.POSITIVE_INFINITY;
boolean wasRealSingularity = false;
boolean wasImagSingularity = false;
while (x <= max) {
boolean needToCalculateRealY = needToCalculate(realSeries, step, x);
@ -263,10 +283,8 @@ public class CalculatorPlotActivity extends Activity {
final Complex c = unwrap(numeric);
Double y = prepareY(c.realPart());
if (y != null) {
//addInfPoint(realSeries, prevX, x, prevRealY, y);
wasRealSingularity = addSingularityPoint(realSeries, prevX, x, prevRealY, y, wasRealSingularity);
realSeries.add(x, y);
maxY = Math.max(maxY, y);
minY = Math.min(minY, y);
prevRealY = y;
prevX = x;
}
@ -275,10 +293,8 @@ public class CalculatorPlotActivity extends Activity {
if (needToCalculateImagY) {
y = prepareY(c.imaginaryPart());
if (y != null) {
//addInfPoint(imagSeries, prevX, x, prevImagY, y);
wasImagSingularity = addSingularityPoint(imagSeries, prevX, x, prevImagY, y, wasImagSingularity);
imagSeries.add(x, y);
maxY = Math.max(maxY, y);
minY = Math.min(minY, y);
prevImagY = y;
prevX = x;
}
@ -293,10 +309,8 @@ public class CalculatorPlotActivity extends Activity {
final Complex c = unwrap(numeric);
Double y = prepareY(c.imaginaryPart());
if (y != null) {
//addInfPoint(imagSeries, prevX, x, prevImagY, y);
wasImagSingularity = addSingularityPoint(imagSeries, prevX, x, prevImagY, y, wasImagSingularity);
imagSeries.add(x, y);
maxY = Math.max(maxY, y);
minY = Math.min(minY, y);
prevImagY = y;
prevX = x;
}
@ -317,12 +331,19 @@ public class CalculatorPlotActivity extends Activity {
return imagExists;
}
private static void addInfPoint(@NotNull XYSeries series, @Nullable Double prevX, @NotNull Double x, @Nullable Double prevY, @NotNull Double y) {
if ( prevX != null && prevY != null) {
if ( Math.abs(prevY / y) > MAX_Y_DIFF || Math.abs(y / prevY) > MAX_Y_DIFF) {
// todo serso: UNABLE TO PLOT i/ln(t)!!!
private static boolean addSingularityPoint(@NotNull XYSeries series, @Nullable Double prevX, @NotNull Double x, @Nullable Double prevY, @NotNull Double y, boolean wasSingularity) {
if ( !wasSingularity && prevX != null && prevY != null) {
if ( y > 0.00000000001d && prevY > 0.00000000001d && (Math.abs(prevY / y) > MAX_Y_DIFF || Math.abs(y / prevY) > MAX_Y_DIFF)) {
//Log.d(CalculatorPlotActivity.class.getName(), "Singularity! Prev point: (" + prevX + ", " + prevY + "), current point: (" +x+ ", " + y +")" );
//Log.d(CalculatorPlotActivity.class.getName(), String.valueOf(prevX + Math.abs(x - prevX) / 2) + ", null");
series.add( prevX + Math.abs(x - prevX) / 2, MathHelper.NULL_VALUE);
return true;
}
}
return false;
}
private static boolean needToCalculate(@NotNull XYSeries series, double step, double x) {
@ -336,16 +357,52 @@ public class CalculatorPlotActivity extends Activity {
return needToCalculateY;
}
public static final class Point implements Serializable {
/**
* The X axis coordinate value.
*/
private double x;
/**
* The Y axis coordinate value.
*/
private double y;
public Point() {
}
public Point(double x, double y) {
this.x = x;
this.y = y;
}
public double getX() {
return x;
}
public double getY() {
return y;
}
public void setX(double x) {
this.x = x;
}
public void setY(double y) {
this.y = y;
}
}
private static void sortSeries(@NotNull XYSeries series) {
final List<Point> values = new ArrayList<Point>(series.getItemCount());
for (int i = 0; i < series.getItemCount(); i++) {
values.add(new Point((float)series.getX(i), (float)series.getY(i)));
values.add(new Point(series.getX(i), series.getY(i)));
}
Collections.sort(values, new Comparator<Point>() {
@Override
public int compare(Point point, Point point1) {
return Float.compare(point.getX(), point1.getX());
return Double.compare(point.getX(), point1.getX());
}
});
series.clear();