Java tutorial
/* * Copyright (C) 2013 Maciej Grski * * 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.androidmapsextensions; import android.content.res.Resources; import android.graphics.Bitmap; import android.graphics.BlurMaskFilter; import android.graphics.Canvas; import android.graphics.Paint; import android.graphics.Rect; import android.graphics.Typeface; import android.support.v4.util.LruCache; import com.google.android.gms.maps.model.BitmapDescriptor; import com.google.android.gms.maps.model.BitmapDescriptorFactory; import java.util.List; import ingbank.com.tr.happybanking.R; public class DefaultClusterOptionsProvider implements ClusterOptionsProvider { private final LruCache<Integer, BitmapDescriptor> cache = new LruCache<Integer, BitmapDescriptor>(128); private final ClusterOptions clusterOptions = new ClusterOptions().anchor(0.5f, 0.5f); private final int[] colors; private final Paint circlePaint; private final Paint circleShadowPaint; private final Paint textPaint; private final Rect bounds = new Rect(); private float blurRadius; private float textPadding; private float shadowBlurRadius; private float shadowOffsetX; private float shadowOffsetY; public DefaultClusterOptionsProvider(Resources resources) { colors = new int[] { resources.getColor(R.color.ame_default_cluster_circle_color_small), resources.getColor(R.color.ame_default_cluster_circle_color_medium), resources.getColor(R.color.ame_default_cluster_circle_color_large), resources.getColor(R.color.ame_default_cluster_circle_color_extra_large), }; circlePaint = createCirclePaint(resources); circleShadowPaint = createCircleShadowPaint(resources); textPaint = createTextPaint(resources); textPadding = resources.getDimension(R.dimen.ame_default_cluster_text_padding); } private Paint createCirclePaint(Resources resources) { Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); blurRadius = resources.getDimension(R.dimen.ame_default_cluster_circle_blur_radius); if (blurRadius > 0.0f) { BlurMaskFilter maskFilter = new BlurMaskFilter(blurRadius, BlurMaskFilter.Blur.SOLID); paint.setMaskFilter(maskFilter); } return paint; } private Paint createCircleShadowPaint(Resources resources) { Paint paint = null; float circleShadowBlurRadius = resources .getDimension(R.dimen.ame_default_cluster_circle_shadow_blur_radius); if (circleShadowBlurRadius > 0.0f) { paint = new Paint(Paint.ANTI_ALIAS_FLAG); float offsetX = resources.getDimension(R.dimen.ame_default_cluster_circle_shadow_offset_x); float offsetY = resources.getDimension(R.dimen.ame_default_cluster_circle_shadow_offset_y); int color = resources.getColor(R.color.ame_default_cluster_circle_shadow_color); paint.setShadowLayer(circleShadowBlurRadius, offsetX, offsetY, color); } return paint; } private Paint createTextPaint(Resources resources) { Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG); paint.setColor(resources.getColor(R.color.ame_default_cluster_text_color)); shadowBlurRadius = resources.getDimension(R.dimen.ame_default_cluster_text_shadow_blur_radius); if (shadowBlurRadius > 0.0f) { shadowOffsetX = resources.getDimension(R.dimen.ame_default_cluster_text_shadow_offset_x); shadowOffsetY = resources.getDimension(R.dimen.ame_default_cluster_text_shadow_offset_y); int shadowColor = resources.getColor(R.color.ame_default_cluster_text_shadow_color); paint.setShadowLayer(shadowBlurRadius, shadowOffsetX, shadowOffsetY, shadowColor); } paint.setTextSize(resources.getDimension(R.dimen.ame_default_cluster_text_size)); paint.setTypeface(Typeface.DEFAULT_BOLD); return paint; } @Override public ClusterOptions getClusterOptions(List<Marker> markers) { int count = markers.size(); BitmapDescriptor icon = cache.get(count); if (icon == null) { icon = createIcon(count); cache.put(count, icon); } clusterOptions.icon(icon); return clusterOptions; } private BitmapDescriptor createIcon(int count) { String text = String.valueOf(count); calculateTextSize(text); int iconSize = calculateIconSize(); Bitmap bitmap = Bitmap.createBitmap(iconSize, iconSize, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); drawCircle(canvas, count, iconSize); drawText(canvas, text, iconSize); return BitmapDescriptorFactory.fromBitmap(bitmap); } private void calculateTextSize(String text) { textPaint.getTextBounds(text, 0, text.length(), bounds); } private int calculateIconSize() { int w = bounds.width(); int h = bounds.height(); return (int) Math.ceil(2 * (textPadding + blurRadius) + Math.sqrt(w * w + h * h)); } private void drawCircle(Canvas canvas, int count, float iconSize) { canvas.drawCircle(iconSize / 2, iconSize / 2, iconSize / 2 - blurRadius, circleShadowPaint); for (int i = colors.length - 1; i >= 0; i--) { if (count >= Math.pow(10, i)) { circlePaint.setColor(colors[i]); break; } } canvas.drawCircle(iconSize / 2, iconSize / 2, iconSize / 2 - blurRadius, circlePaint); } private void drawText(Canvas canvas, String text, int iconSize) { int x = Math.round((iconSize - bounds.width()) / 2 - bounds.left - shadowOffsetX / 2); int y = Math.round((iconSize - bounds.height()) / 2 - bounds.top - shadowOffsetY / 2); canvas.drawText(text, x, y, textPaint); } }