如上效果
主要类似篮球游戏的热点占位图
代码如下:
package img;import java.awt.Color;import java.awt.Graphics2D;import java.awt.RadialGradientPaint;import java.awt.Rectangle;import java.awt.RenderingHints;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.ArrayList;import java.util.List;import java.util.Random;import javax.imageio.ImageIO;/** * 类DrawHeatImage.java的实现描述：TODO 类实现描述 * @author broust 2016年4月4日 下午7:27:44 */public class DrawHeatImage { /** * 绘制热点图 * * @param heatList 热点数量 * @param colNum 一行布局多少个热点 * @param gridSize 单元格子的大小－－只能绘制正方形 * @return */ private static BufferedImage drawHeatImage(List<RectWithHeat> heatList, List<Rectangle> actorList, int width, int height) { // 创建bufferedImage BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics2D g2d = image.createGraphics(); g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); // 底色 g2d.setColor(Color.white); // 整个画布为白色 g2d.fillRect(0, 0, width, height); // 开始绘制格子 －－热点值 for (RectWithHeat area : heatList) { g2d.setColor(getColor(area.getHeat())); g2d.drawString(String.valueOf(area.getHeat()), (int) area.getX(), (int) area.getCenterY()); } // 开始绘制角色 for (Rectangle actor : actorList) { drawActor(g2d, actor, heatList); } g2d.dispose(); return image; } /** * @param g2d * @param actor * @param heatList */ private static void drawActor(Graphics2D g2d, Rectangle actor, List<RectWithHeat> heatList) { Color col = getColor(actor, heatList); Color[] cols = new Color[] { Color.WHITE, col, Color.WHITE };// 过渡的颜色 float[] fts = new float[] { 0.0f, 0.2f, 0.5f };// 标记颜色过滤的范围 // 定义画笔 RadialGradientPaint paint = new RadialGradientPaint((float) actor.getCenterX(), (float) actor.getCenterY(), (float) actor.getHeight(), fts, cols); g2d.setPaint(paint); // 绘制---角色 g2d.fillArc((int) actor.getX(), (int) actor.getY(), (int) actor.getWidth(), (int) actor.getHeight(), 0, 720); } /** * @param actor * @param heatList * @return */ private static Color getColor(Rectangle actor, List<RectWithHeat> heatList) { int touchAreaNum = 0; int totalHeat = 0; for (RectWithHeat heat : heatList) { if (heat.intersects(actor)) { touchAreaNum++; totalHeat += heat.getHeat(); } } return getColor((int) (totalHeat / touchAreaNum)); } /** * 获取颜色 * * @param rate [0-255] * @return */ private static Color getColor(int rate) { /** * 红色:(255,0,0) --->蓝色：(0,0,255) [红，黄，蓝] */ rate = rate < 0 ? 0 : rate > 255 ? 255 : rate; return new Color(rate, 0, 255 - rate); } /** * 保存到文件 * * @param filePath * @param image * @throws IOException */ private static void storeToFile(String filePath, BufferedImage image) throws IOException { File file = new File(filePath); ImageIO.write(image, "JPEG", file); } /** * 生成热点区域数据 * * @param nums * @return */ private static List<RectWithHeat> generateHeatAreas(int areaWidth, int areaHeight, int colNum, int lineNum) { Random r = new Random(); List<RectWithHeat> list = new ArrayList<RectWithHeat>(); for (int i = 0; i < lineNum; i++) { for (int j = 0; j < colNum; j++) { RectWithHeat area = new RectWithHeat(); area.setBounds(j * areaWidth, i * areaHeight, areaWidth, areaHeight); area.setHeat(r.nextInt(256));// 0-255 list.add(area); } } return list; } private static List<Rectangle> generateTestActors(int nums, int height, int backGroundWidth, int backGroundHeight) { Random rW = new Random(); Random rH = new Random(); List<Rectangle> list = new ArrayList<Rectangle>(); for (int i = 0; i < nums; i++) { Rectangle actor = new Rectangle(); actor.setBounds(rW.nextInt(backGroundWidth), rH.nextInt(backGroundHeight), height, height); list.add(actor); } return list; } public static void main(String[] args) throws IOException { List<RectWithHeat> heatDataList = generateHeatAreas(100, 80, 5, 4); List<Rectangle> actorList = generateTestActors(5, 50, 100 * 5, 80 * 4); String filePath = "/Users/broust/tmp/xx/heatImage.jpg"; storeToFile(filePath, drawHeatImage(heatDataList, actorList, 100 * 5, 80 * 4)); } /** * 带热点信息的方块区域 类DrawHeatImage.java的实现描述：TODO 类实现描述 * * @author broust 2016年4月8日 下午6:26:34 */ private static class RectWithHeat extends Rectangle { /** * */ private static final long serialVersionUID = 1L; private int heat; /** * @return the heat */ public int getHeat() { return heat; } /** * @param heat the heat to set */ public void setHeat(int heat) { this.heat = heat; } }}