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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);
}
}
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