1 files changed, 118 insertions, 0 deletions
diff --git a/AndroidPlot-Core/src/main/java/com/androidplot/util/PlotStatistics.java b/AndroidPlot-Core/src/main/java/com/androidplot/util/PlotStatistics.java
new file mode 100644
index 0000000..9703aee
--- /dev/null
+++ b/AndroidPlot-Core/src/main/java/com/androidplot/util/PlotStatistics.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2012 AndroidPlot.com
+ *
+ *    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.androidplot.util;
+
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Paint;
+import android.graphics.RectF;
+import com.androidplot.Plot;
+import com.androidplot.PlotListener;
+
+/**
+ * !!! THIS CLASS IS STILL UNDER DEVELOPMENT AND MAY CONTAIN BUGS !!!
+ * Gathers performance statistics from a Plot.  Instances of PlotStatistics
+ * should never be added to more than one Plot, otherwise the statiscs will
+ * be invalid.
+ */
+public class PlotStatistics implements PlotListener {
+    long minRenderTimeMs;
+    long maxRenderTimeMs;
+    long avgRenderTimeMs;
+    long fps;
+    long updateDelayMs;
+
+
+    long longestRenderMs = 0;
+    long shortestRenderMs = 0;
+    long lastStart = 0;
+    long lastLatency = 0;
+    long lastAnnotation;
+    long latencySamples = 0;
+    long latencySum = 0;
+    String annotationString = "";
+
+    private Paint paint;
+    {
+        paint = new Paint();
+        paint.setTextAlign(Paint.Align.CENTER);
+        paint.setColor(Color.WHITE);
+        paint.setTextSize(30);
+        resetCounters();
+    }
+
+
+    private boolean annotatePlotEnabled;
+
+
+
+    public PlotStatistics(long updateDelayMs, boolean annotatePlotEnabled) {
+        this.updateDelayMs = updateDelayMs;
+        this.annotatePlotEnabled = annotatePlotEnabled;
+    }
+
+    public void setAnnotatePlotEnabled(boolean enabled) {
+        this.annotatePlotEnabled = enabled;
+    }
+
+    private void resetCounters() {
+        longestRenderMs = 0;
+        shortestRenderMs = 999999999;
+        latencySamples = 0;
+        latencySum = 0;
+    }
+
+    private void annotatePlot(Plot source, Canvas canvas) {
+        long nowMs = System.currentTimeMillis();
+        // throttle the update frequency:
+        long msSinceUpdate = (nowMs - lastAnnotation);
+        if(msSinceUpdate >= updateDelayMs) {
+
+            float avgLatency = latencySamples > 0 ?  latencySum/latencySamples : 0;
+            String overallFPS = String.format("%.2f", latencySamples > 0 ?  (1000f/msSinceUpdate) * latencySamples : 0);
+            String potentialFPS = String.format("%.2f", latencySamples > 0 ? 1000f/avgLatency : 0);
+            annotationString = "FPS (potential): " + potentialFPS + " FPS (actual): " + overallFPS + " Latency (ms) Avg: " + lastLatency + " \nMin: " + shortestRenderMs +
+                    " Max: " + longestRenderMs;
+            lastAnnotation = nowMs;
+            resetCounters();
+        }
+        RectF r = source.getDisplayDimensions().canvasRect;
+        if(annotatePlotEnabled) {
+            canvas.drawText(annotationString, r.centerX(),  r.centerY(), paint);
+        }
+    }
+
+    @Override
+    public void onBeforeDraw(Plot source, Canvas canvas) {
+        lastStart = System.currentTimeMillis();
+    }
+
+    @Override
+    public void onAfterDraw(Plot source, Canvas canvas) {
+        lastLatency = System.currentTimeMillis() - lastStart;
+        if(lastLatency < shortestRenderMs) {
+            shortestRenderMs = lastLatency;
+        }
+
+        if(lastLatency > longestRenderMs) {
+            longestRenderMs = lastLatency;
+        }
+        latencySum += lastLatency;
+        latencySamples++;
+        annotatePlot(source, canvas);
+    }
+}