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plotting

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This commit is contained in:
Sergey Solovyev 2011-12-05 19:08:56 +04:00
parent be90bbf309
commit 02a37a56f0
2 changed files with 58 additions and 17 deletions
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72
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;
@ -21,6 +22,7 @@ import jscl.math.function.Constant;
import jscl.math.numeric.Complex;
import jscl.math.numeric.Numeric;
import jscl.math.numeric.Real;
import jscl.text.MutableInt;
import jscl.text.ParseException;
import org.achartengine.ChartFactory;
import org.achartengine.GraphicalView;
@ -130,13 +132,26 @@ public class CalculatorPlotActivity extends Activity {
double maxY = Double.MIN_VALUE;
for (XYSeries series : chart.getDataset().getSeries()) {
if (checkMinMaxValue(series.getMinX())) {
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);
if (checkMinMaxValue(series.getMinY())) {
minY = Math.min(minY, series.getMinY());
}
if (checkMinMaxValue(series.getMaxX())) {
maxX = Math.max(maxX, series.getMaxX());
}
if (checkMinMaxValue(series.getMaxY())) {
maxY = Math.max(maxY, series.getMaxY());
}
}
Log.d(CalculatorPlotActivity.class.getName(), "min x: " + minX + ", min y: " + minY + ", max x: " + maxX + ", max y: " + maxY);
Log.d(CalculatorPlotActivity.class.getName(), "Plot boundaries are " + plotBoundaries);
if (plotBoundaries == null) {
chart.getRenderer().setXAxisMin(Math.max(minX, minValue));
@ -175,6 +190,10 @@ public class CalculatorPlotActivity extends Activity {
updateDataSets(chart);
}
private boolean checkMinMaxValue(@NotNull Double value) {
return !value.equals(MathHelper.NULL_VALUE);
}
private void updateDataSets(@NotNull final XYChart chart) {
pendingOperation.setObject(new Runnable() {
@Override
@ -279,18 +298,22 @@ public class CalculatorPlotActivity extends Activity {
}
final int numberOfSteps = DEFAULT_NUMBER_OF_STEPS;
final double step = Math.max((max - min) / numberOfSteps, 0.000000001);
double x = min;
final double step = Math.max( dist / numberOfSteps, 0.000000001);
Double prevRealY = null;
Double prevX = null;
Double prevImagY = null;
final MutableInt realSeriesI = new MutableInt(0);
final MutableInt imagSeriesI = new MutableInt(0);
double x = min;
while (x <= max) {
boolean needToCalculateRealY = needToCalculate(realSeries, step, x);
boolean needToCalculateRealY = needToCalculate(realSeries, step, x, realSeriesI);
if (needToCalculateRealY) {
Generic numeric = expression.substitute(variable, Expression.valueOf(x)).numeric();
final Complex c = unwrap(numeric);
final Complex c = calculatorExpression(expression, variable, x);
Double y = prepareY(c.realPart());
if (y != null) {
addSingularityPoint(realSeries, prevX, x, prevRealY, y);
@ -299,7 +322,7 @@ public class CalculatorPlotActivity extends Activity {
prevX = x;
}
boolean needToCalculateImagY = needToCalculate(imagSeries, step, x);
boolean needToCalculateImagY = needToCalculate(imagSeries, step, x, imagSeriesI);
if (needToCalculateImagY) {
y = prepareY(c.imaginaryPart());
if (y != null) {
@ -313,10 +336,9 @@ public class CalculatorPlotActivity extends Activity {
}
}
} else {
boolean needToCalculateImagY = needToCalculate(imagSeries, step, x);
boolean needToCalculateImagY = needToCalculate(imagSeries, step, x, imagSeriesI);
if (needToCalculateImagY) {
Generic numeric = expression.substitute(variable, Expression.valueOf(x)).numeric();
final Complex c = unwrap(numeric);
final Complex c = calculatorExpression(expression, variable, x);
Double y = prepareY(c.imaginaryPart());
if (y != null) {
addSingularityPoint(imagSeries, prevX, x, prevImagY, y);
@ -341,6 +363,11 @@ public class CalculatorPlotActivity extends Activity {
return imagExists;
}
@NotNull
private static Complex calculatorExpression(@NotNull Generic expression, @NotNull Constant variable, double x) {
return unwrap(expression.substitute(variable, Expression.valueOf(x)).numeric());
}
// todo serso: UNABLE TO PLOT i/ln(t)!!!
private static void addSingularityPoint(@NotNull XYSeries series, @Nullable Double prevX, @NotNull Double x, @Nullable Double prevY, @NotNull Double y) {
@ -353,10 +380,10 @@ public class CalculatorPlotActivity extends Activity {
}
}
private static boolean needToCalculate(@NotNull XYSeries series, double step, double x) {
private static boolean needToCalculate(@NotNull XYSeries series, double step, double x, @NotNull MutableInt i) {
boolean needToCalculateY = true;
for ( int i = 0; i < series.getItemCount(); i++ ){
if ( Math.abs(x - series.getX(i)) < step ) {
for ( ; i.intValue() < series.getItemCount(); i.increment() ){
if ( Math.abs(x - series.getX(i.intValue())) < step ) {
needToCalculateY = false;
break;
}
@ -390,6 +417,16 @@ public class CalculatorPlotActivity extends Activity {
this.xMax = renderer.getXAxisMax();
this.yMax = renderer.getYAxisMax();
}
@Override
public String toString() {
return "PlotBoundaries{" +
"yMax=" + yMax +
", yMin=" + yMin +
", xMax=" + xMax +
", xMin=" + xMin +
'}';
}
}
private static final class Point implements Serializable {
@ -440,9 +477,12 @@ public class CalculatorPlotActivity extends Activity {
return Double.compare(point.getX(), point1.getX());
}
});
Log.d(CalculatorPlotActivity.class.getName(), "Points for " + series.getTitle());
series.clear();
for (Point value : values) {
series.add(value.getX(), value.getY());
Log.d(CalculatorPlotActivity.class.getName(), "x = " + value.getX() + ", y = " + value.getY());
}
}

1
src/test/java/org/solovyev/android/calculator/model/CalculatorEngineTest.java
View File

@ -153,6 +153,7 @@ public class CalculatorEngineTest {
try {
cm.getEngine().setDefaultAngleUnit(AngleUnit.rad);
Assert.assertEquals("0.451", cm.evaluate(JsclOperation.numeric, "acos(0.8999999999999811)").getResult());
Assert.assertEquals("-0.959", cm.evaluate(JsclOperation.numeric, "sin(5)").getResult());
Assert.assertEquals("-4.795", cm.evaluate(JsclOperation.numeric, "sin(5)si").getResult());
Assert.assertEquals("-23.973", cm.evaluate(JsclOperation.numeric, "sisin(5)si").getResult());