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new plotter

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This commit is contained in:
Sergey Solovyev 2013-01-16 00:02:22 +04:00
parent 3a55ff6fb7
commit 9ad431ffd3
3 changed files with 107 additions and 83 deletions
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150
android-app/src/main/java/org/solovyev/android/calculator/plot/CalculatorGraph2dView.java
View File

@ -4,12 +4,7 @@ package org.solovyev.android.calculator.plot;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.DashPathEffect;
import android.graphics.Matrix;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.*;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
@ -18,6 +13,7 @@ import android.widget.ZoomButtonsController;
import org.javia.arity.Function;
import org.jetbrains.annotations.NotNull;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
@ -35,6 +31,14 @@ public class CalculatorGraph2dView extends View implements GraphView {
private static final float TICKS_COUNT = 15;
public static final int TICK_SIZE_PXS = 3;
private static final DecimalFormat tickFormat = new DecimalFormat("##0.#####E0");
private static final int MAX_TICK_DIGITS = 4;
private static final String[] TICK_FORMATS = new String[MAX_TICK_DIGITS];
static {
for(int i = 0; i < MAX_TICK_DIGITS; i++) {
TICK_FORMATS[i] = "%." + i + "f";
}
}
/*
**********************************************************************
*
@ -130,8 +134,9 @@ public class CalculatorGraph2dView extends View implements GraphView {
@Override
public void setXRange(float xMin, float xMax) {
this.x0 = xMin + graphWidth / 2;
this.graphWidth = xMax - xMin;
this.x0 = xMin + graphWidth / 2;
this.y0 = 0;
}
private void clearAllGraphs() {
@ -178,7 +183,6 @@ public class CalculatorGraph2dView extends View implements GraphView {
widthPxs = w;
heightPxs = h;
clearAllGraphs();
// points = new float[w+w];
}
protected void onDraw(Canvas canvas) {
@ -186,9 +190,9 @@ public class CalculatorGraph2dView extends View implements GraphView {
return;
}
if (scroller.computeScrollOffset()) {
final float scale = graphWidth / widthPxs;
x0 = scroller.getCurrX() * scale;
y0 = scroller.getCurrY() * scale;
final float ration = getRatio();
x0 = scroller.getCurrX() * ration;
y0 = scroller.getCurrY() * ration;
if (!scroller.isFinished()) {
invalidate();
}
@ -235,13 +239,7 @@ public class CalculatorGraph2dView extends View implements GraphView {
float yMax,
@NotNull GraphData graph) {
if (function.arity() == 0) {
float v = (float) function.eval();
if (v < -10000f) {
v = -10000f;
}
if (v > 10000f) {
v = 10000f;
}
final float v = (float) function.eval();
graph.clear();
graph.push(xMin, v);
graph.push(xMax, v);
@ -262,10 +260,10 @@ public class CalculatorGraph2dView extends View implements GraphView {
graph.push(xMin, eval(function, xMin));
}
final float scale = getRatio();
final float maxStep = 15.8976f / scale;
final float minStep = .05f / scale;
float ythresh = 1 / scale;
final float ratio = getRatio();
final float maxStep = 15.8976f * ratio;
final float minStep = .05f * ratio;
float ythresh = ratio;
ythresh = ythresh * ythresh;
@ -354,9 +352,9 @@ public class CalculatorGraph2dView extends View implements GraphView {
final float y = ys[i];
final float x = xs[i];
if (y != y) {
if (Float.isNaN(y)) {
newCurve = true;
} else { // !NaN
} else {
if (newCurve) {
path.moveTo(x, y);
newCurve = false;
@ -387,45 +385,6 @@ public class CalculatorGraph2dView extends View implements GraphView {
}
}
private static StringBuilder b = new StringBuilder();
private static char[] buf = new char[20];
@NotNull
private static CharSequence formatTick(final float tickValue) {
/*int pos = 0;
boolean addDot = false;
final boolean negative = tickValue < 0;
int absValue = Math.round(Math.abs(tickValue) * 100);
for (int i = 0; i < 2; ++i) {
int digit = absValue % 10;
absValue /= 10;
if (digit != 0 || addDot) {
buf[pos++] = (char) ('0' + digit);
addDot = true;
}
}
if (addDot) {
buf[pos++] = '.';
}
if (absValue == 0) {
buf[pos++] = '0';
}
while (absValue != 0) {
buf[pos++] = (char) ('0' + (absValue % 10));
absValue /= 10;
}
if (negative) {
buf[pos++] = '-';
}
b.setLength(0);
b.append(buf, 0, pos);
b.reverse();
return b;*/
return Float.toString(tickValue);
}
private void drawGraph(@NotNull Canvas canvas) {
final float graphHeight = getGraphHeight();
@ -452,14 +411,14 @@ public class CalculatorGraph2dView extends View implements GraphView {
final float ratio = getRatio();
float x0px = -xMin * ratio;
float x0px = -xMin / ratio;
if (x0px < 25) {
x0px = 25;
} else if (x0px > widthPxs - 3) {
x0px = widthPxs - 3;
}
float y0px = yMax * ratio;
float y0px = yMax / ratio;
if (y0px < 3) {
y0px = 3;
} else if (y0px > heightPxs - 15) {
@ -478,38 +437,36 @@ public class CalculatorGraph2dView extends View implements GraphView {
textPaint.setTextAlign(Paint.Align.CENTER);
final float step = getStep(graphWidth);
final int tickDigits = countTickDigits(step);
// round xMin and init first tick
float tick = ((int) (xMin / step)) * step;
final float y2 = y0px + TICK_SIZE_PXS;
float stepPxs = step * ratio;
for (float xPxs = (tick - xMin) * ratio; xPxs <= widthPxs; xPxs += stepPxs, tick += step) {
final float stepPxs = step / ratio;
for (float xPxs = (tick - xMin) / ratio; xPxs <= widthPxs; xPxs += stepPxs, tick += step) {
// draw grid line
canvas.drawLine(xPxs, 0, xPxs, heightPxs, paint);
if (Math.abs(tick) >= .001f) {
final CharSequence tickLabel = formatTick(tick);
final CharSequence tickLabel = formatTick(tick, tickDigits);
// draw tick label
canvas.drawText(tickLabel, 0, tickLabel.length(), xPxs, y2 + 10, textPaint);
}
}
final float x1 = x0px - TICK_SIZE_PXS;
tick = ((int) (yMin / step)) * step;
textPaint.setTextAlign(Paint.Align.RIGHT);
for (float y = heightPxs - (tick - yMin) * ratio; y >= 0; y -= stepPxs, tick += step) {
for (float y = heightPxs - (tick - yMin) / ratio; y >= 0; y -= stepPxs, tick += step) {
canvas.drawLine(0, y, widthPxs, y, paint);
if (Math.abs(tick) >= .001f) {
final CharSequence tickLabel = formatTick(tick);
final CharSequence tickLabel = formatTick(tick, tickDigits);
// draw tick label
canvas.drawText(tickLabel, 0, tickLabel.length(), x1, y + 4, textPaint);
}
}
paint.setPathEffect(null);
}
@ -525,7 +482,7 @@ public class CalculatorGraph2dView extends View implements GraphView {
matrix.reset();
matrix.preTranslate(-this.x0, -this.y0);
matrix.postScale(ratio, -ratio);
matrix.postScale(1/ratio, -1/ratio);
matrix.postTranslate(widthPxs / 2, heightPxs / 2);
paint.setAntiAlias(false);
@ -556,6 +513,43 @@ public class CalculatorGraph2dView extends View implements GraphView {
lastXMin = xMin;
}
/*
**********************************************************************
*
* TICK FORMAT
*
**********************************************************************
*/
@NotNull
public static CharSequence formatTick(final float tickValue, final int tickDigits) {
String result = "0";
if (tickValue != 0f) {
if (tickDigits < MAX_TICK_DIGITS) {
result = String.format(TICK_FORMATS[tickDigits], tickValue);
} else {
// x.xxE-10 notation
result = tickFormat.format(tickValue);
}
}
return result;
}
public static int countTickDigits(float step) {
if ( step >= 1 ) {
return 0;
} else {
int tickDigits = 0;
while ( step < 1 ) {
step *= 10;
tickDigits++;
}
return tickDigits;
}
}
/*
**********************************************************************
*
@ -605,8 +599,8 @@ public class CalculatorGraph2dView extends View implements GraphView {
}
private float getRatio() {
if (graphWidth != 0) {
return widthPxs / graphWidth;
if (widthPxs != 0) {
return graphWidth / widthPxs;
} else {
return 0;
}
@ -705,7 +699,7 @@ public class CalculatorGraph2dView extends View implements GraphView {
} else if (asy < asx / 3) {
sy = 0;
}
scroller.fling(Math.round(x0 * ratio), Math.round(y0 * ratio), Math.round(sx), Math.round(sy), Integer.MIN_VALUE, Integer.MAX_VALUE, Integer.MIN_VALUE, Integer.MAX_VALUE);
scroller.fling(Math.round(x0 / ratio), Math.round(y0 / ratio), Math.round(sx), Math.round(sy), Integer.MIN_VALUE, Integer.MAX_VALUE, Integer.MIN_VALUE, Integer.MAX_VALUE);
invalidate();
}

2
android-app/src/main/java/org/solovyev/android/calculator/plot/CalculatorPlotFragment.java
View File

@ -73,8 +73,8 @@ public class CalculatorPlotFragment extends AbstractCalculatorPlotFragment {
}
graphView.init(FunctionViewDef.newInstance(Color.WHITE, Color.WHITE, Color.DKGRAY, getBgColor()));
graphView.setFunctionPlotDefs(arityFunctions);
graphView.setXRange((float)plotBoundaries.getXMin(), (float)plotBoundaries.getXMax());
graphView.setFunctionPlotDefs(arityFunctions);
graphContainer.addView((View) graphView);
}

30
android-app/src/test/java/org/solovyev/android/calculator/plot/CalculatorGraph2dViewTest.java Normal file
View File

@ -0,0 +1,30 @@
package org.solovyev.android.calculator.plot;
import junit.framework.Assert;
import org.junit.Test;
/**
* User: serso
* Date: 1/15/13
* Time: 9:58 PM
*/
public class CalculatorGraph2dViewTest {
@Test
public void testFormatTick() throws Exception {
Assert.assertEquals("23324", CalculatorGraph2dView.formatTick(23324.0f, 0));
Assert.assertEquals("23324.1", CalculatorGraph2dView.formatTick(23324.1f, 1));
}
@Test
public void testCountTickDigits() throws Exception {
Assert.assertEquals(0, CalculatorGraph2dView.countTickDigits(1));
Assert.assertEquals(0, CalculatorGraph2dView.countTickDigits(10));
Assert.assertEquals(0, CalculatorGraph2dView.countTickDigits(100));
Assert.assertEquals(1, CalculatorGraph2dView.countTickDigits(0.9f));
Assert.assertEquals(1, CalculatorGraph2dView.countTickDigits(0.2f));
Assert.assertEquals(1, CalculatorGraph2dView.countTickDigits(0.1f));
Assert.assertEquals(2, CalculatorGraph2dView.countTickDigits(0.099f));
Assert.assertEquals(3, CalculatorGraph2dView.countTickDigits(0.009f));
}
}