diff options
Diffstat (limited to 'LoopbackApp/app/src/main/java/org/drrickorang/loopback/HistogramView.java')
| -rw-r--r-- | LoopbackApp/app/src/main/java/org/drrickorang/loopback/HistogramView.java | 108 |
1 files changed, 63 insertions, 45 deletions
diff --git a/LoopbackApp/app/src/main/java/org/drrickorang/loopback/HistogramView.java b/LoopbackApp/app/src/main/java/org/drrickorang/loopback/HistogramView.java index d20f404..96490a8 100644 --- a/LoopbackApp/app/src/main/java/org/drrickorang/loopback/HistogramView.java +++ b/LoopbackApp/app/src/main/java/org/drrickorang/loopback/HistogramView.java @@ -15,14 +15,18 @@ public class HistogramView extends View { private Paint mHistPaint; private Paint mTextPaint; private Paint mLinePaint; + private Paint mXLabelPaint; private static int[] mData; - private static int mMaxLatency = 0; + private static int mMaxBufferPeriod = 0; private static boolean mExceedRange = false; private int mBase = 10; //base of logarithm private int mNumberOfXLabel = 4; - private int mTextSize = 30; + private int mYLabelSize = 30; + private int mXLabelSize = 22; private int mLineWidth = 3; + private int mHistogramInterval = 2; // separate each beam in the histogram by such amount + int mExtraYMargin = 5; // the extra margin between y labels and y-axis public HistogramView(Context context, AttributeSet attrs) { super(context, attrs); @@ -37,7 +41,11 @@ public class HistogramView extends View { mTextPaint = new Paint(Paint.ANTI_ALIAS_FLAG); mTextPaint.setColor(Color.RED); - mTextPaint.setTextSize(mTextSize); + mTextPaint.setTextSize(mYLabelSize); + + mXLabelPaint = new Paint(Paint.ANTI_ALIAS_FLAG); + mXLabelPaint.setColor(Color.BLACK); + mXLabelPaint.setTextSize(mXLabelSize); mLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG); mLinePaint.setColor(Color.BLACK); @@ -54,16 +62,15 @@ public class HistogramView extends View { return; } - if (mMaxLatency != 0) { - + if (mMaxBufferPeriod != 0) { // the range of latencies that's going to be displayed on histogram int range; - if (mMaxLatency > arrayLength - 1) { + if (mMaxBufferPeriod > arrayLength - 1) { range = arrayLength; mExceedRange = true; } else { - range = mMaxLatency + 1; + range = mMaxBufferPeriod + 1; mExceedRange = false; } @@ -75,68 +82,82 @@ public class HistogramView extends View { int right = this.getRight(); int bottom = this.getBottom(); - // calculate the max frequency among all latencies - int maxLatencyFreq = 0; + int maxBufferPeriodFreq = 0; for (int i = 1; i < arrayLength; i++) { - if (mData[i] > maxLatencyFreq) { - maxLatencyFreq = mData[i]; + if (mData[i] > maxBufferPeriodFreq) { + maxBufferPeriodFreq = mData[i]; } } - - if (maxLatencyFreq == 0) { + if (maxBufferPeriodFreq == 0) { return; } - // find the closest order of 10 according to maxLatencyFreq + // find the closest order of "mBase" according to maxBufferPeriodFreq int order = 0; - while (Math.pow(mBase, order) < maxLatencyFreq) { + while (Math.pow(mBase, order) < maxBufferPeriodFreq) { order += 1; } - float height =( (float) (bottom - mTextSize) / (order + 1)); // height for one decade - - - + float height =( (float) (bottom - mXLabelSize - mLineWidth) / (order + 1)); // height for one decade - // TODO add x labels - int totalXLabel = mNumberOfXLabel + 1; // last label is for the last beam - // y labels String[] yLabels = new String[order+2]; // will store {"0", "1", "10", "100", ...} for base = 10 yLabels[0] = "0"; - canvas.drawText(yLabels[0], 0, bottom - mTextSize - mLineWidth, mTextPaint); + int yStartPoint = bottom - mXLabelSize - mLineWidth; + canvas.drawText(yLabels[0], 0, yStartPoint, mTextPaint); int currentValue = 1; for (int i = 1; i <= (order + 1); i++) { yLabels[i] = Integer.toString(currentValue); - // FIXME since no margin added, can't show the top y label (100) -> fixed. now it display lower by amount of textsize - canvas.drawText(yLabels[i], 0, bottom - (i * height), mTextPaint); // for the third argument, + mTextSize - mTextSize cancels out - currentValue *= 10; + // Label is displayed at a height that's lower than it should be by the amount of "mYLabelSize" + canvas.drawText(yLabels[i], 0, yStartPoint - (i * height) + mYLabelSize, mTextPaint); + currentValue *= mBase; } + + // draw x axis - canvas.drawLine(0, bottom - mTextSize, right, bottom - mTextSize, mLinePaint); + canvas.drawLine(0, bottom - mXLabelSize, right, bottom - mXLabelSize, mLinePaint); // draw y axis int yMargin = getTextWidth(yLabels[order+1], mTextPaint); - int extraYMargin = 5; - canvas.drawLine(yMargin + extraYMargin, bottom, yMargin + extraYMargin, 0, mLinePaint); + canvas.drawLine(yMargin + mExtraYMargin, bottom, yMargin + mExtraYMargin, 0, mLinePaint); + + // width of each beam in the histogram + float width = ((float) (right - yMargin - mExtraYMargin - mLineWidth - range * mHistogramInterval) / range); + + // draw x labels + String[] xLabels = new String[mNumberOfXLabel]; + int xLabelInterval = (range - 2) / mNumberOfXLabel; + xLabels[0] = "0"; // first label is for 0 + canvas.drawText(xLabels[0], yMargin - getTextWidth(xLabels[0], mXLabelPaint), bottom, mXLabelPaint); + + int xStartPoint = yMargin + mExtraYMargin + mLineWidth; // position where first beam is placed on x-axis + for (int i = 1; i < mNumberOfXLabel; i++) { + xLabels[i] = Integer.toString(i * xLabelInterval); + canvas.drawText(xLabels[i], xStartPoint + (xLabelInterval * i * (width + mHistogramInterval)), bottom, mXLabelPaint); + } + String lastXLabel; // last label is for the last beam + if (mExceedRange) { + lastXLabel = Integer.toString(range - 1) + "+"; + } else { + lastXLabel = Integer.toString(range - 1); + } + canvas.drawText(lastXLabel, right - getTextWidth(lastXLabel, mXLabelPaint) - 1, bottom, mXLabelPaint); - float width = ((float) (right - yMargin - extraYMargin - mLineWidth) / range); // width of each beam in the histogram - float currentLeft = yMargin + extraYMargin + mLineWidth; // FIXME there's an extra 1 pixel split, not sure why + // draw the histogram + float currentLeft = yMargin + mExtraYMargin + mLineWidth; // FIXME there's an extra 1 pixel split, not sure why float currentTop; float currentRight; - // TODO separate each beam - // draw the histogram - mData[0] = 1; - mData[range-1] = 1; - int currentBottom = bottom - mTextSize - mLineWidth; + int currentBottom = bottom - mXLabelSize - mLineWidth; + for (int i = 0; i < range; i++) { currentRight = currentLeft + width; + // calculate the height of the beam if (mData[i] == 0) { currentTop = currentBottom; @@ -146,18 +167,14 @@ public class HistogramView extends View { } canvas.drawRect(currentLeft, currentTop, currentRight, currentBottom, mHistPaint); - currentLeft = currentRight; + currentLeft = currentRight + mHistogramInterval; } - - - - - } } + // get the width of a certain string, using a certain paint public int getTextWidth(String text, Paint paint) { Rect bounds = new Rect(); @@ -170,8 +187,9 @@ public class HistogramView extends View { invalidate(); } + // Copy data into internal buffer - public static void setLatencyArray(int[] pData) { + public static void setBufferPeriodArray(int[] pData) { if (mData == null || pData.length != mData.length) { mData = new int[pData.length]; } @@ -179,8 +197,8 @@ public class HistogramView extends View { // postInvalidate(); } - public static void setMaxLatency(int latency) { - mMaxLatency = latency; + public static void setMaxBufferPeriod(int BufferPeriod) { + mMaxBufferPeriod = BufferPeriod; } } |