1 files changed, 114 insertions, 0 deletions
diff --git a/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/widgets/scaleview/MapScaleView.java b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/widgets/scaleview/MapScaleView.java
new file mode 100644
index 0000000000..02cb09a575
--- /dev/null
+++ b/platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/maps/widgets/scaleview/MapScaleView.java
@@ -0,0 +1,114 @@
+package com.mapbox.mapboxsdk.maps.widgets.scaleview;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.graphics.Rect;
+import android.util.AttributeSet;
+import android.view.View;
+
+import com.mapbox.mapboxsdk.camera.CameraPosition;
+import com.mapbox.mapboxsdk.maps.Projection;
+
+
+public class MapScaleView extends View {
+
+    private final Paint paint;
+    private final ViewConfig viewConfig;
+    private final MapScaleModel mapScaleModel;
+
+    private final float textHeight;
+    private final float strokeWidth;
+    private final float horizontalLineY;
+
+    private Scale scale;
+
+    public MapScaleView(Context context) {
+        this(context, null);
+    }
+
+    public MapScaleView(Context context, AttributeSet attrs) {
+        this(context, attrs, 0);
+    }
+
+    public MapScaleView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+
+        mapScaleModel = new MapScaleModel();
+
+        viewConfig = new ViewConfig(context, attrs);
+
+        paint = new Paint();
+        paint.setAntiAlias(true);
+        paint.setTextSize(viewConfig.textSize);
+        paint.setStrokeWidth(viewConfig.strokeWidth);
+        paint.setColor(viewConfig.color);
+
+        strokeWidth = viewConfig.strokeWidth;
+
+        Rect textRect = new Rect();
+        paint.getTextBounds("A", 0, 1, textRect);
+        textHeight = textRect.height();
+
+        horizontalLineY = textHeight + textHeight / 2;
+    }
+
+    public void update(Projection projection, CameraPosition cameraPosition) {
+        scale = mapScaleModel.setProjection(projection, cameraPosition);
+        invalidate();
+    }
+
+    @Override
+    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
+        int width = measureDimension(desiredWidth(), widthMeasureSpec);
+        int height = measureDimension(desiredHeight(), heightMeasureSpec);
+
+        mapScaleModel.setMaxWidth(width);
+
+        setMeasuredDimension(width, height);
+    }
+
+    private int desiredWidth() {
+        return viewConfig.desiredWidth;
+    }
+
+    private int desiredHeight() {
+        return (int) (paint.getTextSize() * 1.5 + paint.getStrokeWidth());
+    }
+
+    private int measureDimension(int desiredSize, int measureSpec) {
+        int mode = View.MeasureSpec.getMode(measureSpec);
+        int size = View.MeasureSpec.getSize(measureSpec);
+
+        if (mode == View.MeasureSpec.EXACTLY) {
+            return size;
+        } else if (mode == View.MeasureSpec.AT_MOST) {
+            return Math.min(desiredSize, size);
+        } else {
+            return desiredSize;
+        }
+    }
+
+    @Override
+    public void onDraw(Canvas canvas) {
+        canvas.save();
+
+        drawView(canvas, paint);
+
+        canvas.restore();
+    }
+
+    private void drawView(Canvas canvas, Paint paint) {
+        if (scale == null) return;
+
+        final float lineLength = scale.length();
+        final String text = scale.text();
+
+        canvas.drawText(text, 0, textHeight, paint);
+
+        float verticalLineX = lineLength - strokeWidth / 2;
+
+        canvas.drawLine(0, horizontalLineY, lineLength, horizontalLineY, paint);
+        canvas.drawLine(verticalLineX, horizontalLineY, verticalLineX, textHeight, paint);
+    }
+}