gd - php中如何获得双色图片的mask
- WBOY原創
- 2016-06-06 20:52:301049瀏覽
在php中如何实现上图的效果？要求：“上”和“爱情”都是通过程序自动输出的，程序能共自动判断画布上得空白部分并输出文字。
在python中，有pygame库直接获得一个画布的mask，然后提供collide函数来判断两个mask是否有交集。php是否有类似功能？
换个问题：
php中如何获得双色图片的mask
回复内容：
在php中如何实现上图的效果？要求：“上”和“爱情”都是通过程序自动输出的，程序能共自动判断画布上得空白部分并输出文字。
在python中，有pygame库直接获得一个画布的mask，然后提供collide函数来判断两个mask是否有交集。php是否有类似功能？
换个问题：
php中如何获得双色图片的mask
更新下算法解释，貌似做成php版的还算简单
http://ued.ctrip.com/blog/?p=2471
携程的算法源码如下：
package com.ctrip;
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.Paint;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import javax.imageio.ImageIO;
public class WordsThumb
{
public static final int MIN_WIDTH = 320;
public static final int MIN_HEIGHT = 240;
public static final int MAX_WIDTH = 2560;
public static final int MAX_HEIGHT = 1920;
public static final int BLOCK = 4;
public static final String DEF_FONT = "微软雅黑";
public static final int MIN_FONT_SIZE = 12;
private static final int[] COLORS = { 11682842, 14439168,
13081114, 10300417, 14450176, 13052357, 11665801, 1739698,
101319, 84146, 15580865, 1722823, 6664705, 11257601,
7582257, 11665680, 14425600, 10768192, 14360836, 15515347,
111266, 49372, 15436032, 15436032 };
public BufferedImage createWordsThumb(Map<string integer> words, int width, int height, String fontName, Integer maxFontSize, Integer minFontSize)
{
if ((words == null) || (words.size() 2560) || (height 1920))
return null;
fontName = validateFontName(fontName, "微软雅黑");
List sortedWords = sortWordsMap(words);
BufferedImage bi = createBufferedImage(width, height);
if (bi == null) {
return null;
}
if (maxFontSize == null) {
maxFontSize = Integer.valueOf(Math.min(width, height) / 5);
}
if (minFontSize == null) {
minFontSize = Integer.valueOf(Math.min(width, height) / 40);
}
if (minFontSize.intValue() > sortWordsMap(Map<string integer> words) {
if (words == null)
return null;
ArrayList wordsList = new ArrayList(
words.entrySet());
Collections.sort(wordsList,
new Comparator()
{
public int compare(Map.Entry<string integer> o1, Map.Entry<string integer> o2)
{
return o2 == null ? -1 : o1 == null ? 1 :
((Integer)o2
.getValue()).intValue() - ((Integer)o1.getValue()).intValue();
}
});
return wordsList;
}
private BufferedImage createBufferedImage(int width, int height) {
BufferedImage bi = new BufferedImage(width, height,
2);
Graphics2D g2 = bi.createGraphics();
bi = g2.getDeviceConfiguration().createCompatibleImage(width, height,
3);
g2.dispose();
return bi;
}
private int paintWords(BufferedImage bi, List<map.entry integer>> words, String fontName, int maxFontSize, int minFontSize)
{
BitMap bitMap = initBitMap(bi);
Graphics2D g2 = bi.createGraphics();
int wordCount = 0;
int fontSizeAdjust = 0;
int maxFrequency = ((Integer)((Map.Entry)words.get(0)).getValue()).intValue();
int minFrequency = ((Integer)((Map.Entry)words.get(words.size() - 1)).getValue()).intValue();
for (Map.Entry entry : words)
{
while (true)
{
Font font = initFont(g2, fontName, Integer.valueOf(maxFontSize), Integer.valueOf(minFontSize),
(Integer)entry.getValue(), Integer.valueOf(maxFrequency), Integer.valueOf(minFrequency),
Integer.valueOf(fontSizeAdjust));
if (font.getSize() minFrequency.intValue()) {
fs = (int)((frequency.intValue() - minFrequency.intValue()) * (
maxFontSize.intValue() - minFontSize.intValue()) / (
maxFrequency.intValue() - minFrequency.intValue()) + minFontSize.intValue());
}
if (fontSizeAdjust != null) {
fs += fontSizeAdjust.intValue();
}
Font font = new Font(fontName, 1, fs);
g2.setFont(font);
g2.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
return font;
}
private Rectangle2D getStringBounds(Graphics2D g2, Font font, String key)
{
FontRenderContext frc = g2.getFontRenderContext();
Rectangle2D rc = font.getStringBounds(key, frc);
return rc;
}
private Rectangle2D findSpace(BitMap bitMap, Rectangle2D rect) {
int w = pixel2bitMap((int)rect.getWidth());
int h = pixel2bitMap((int)rect.getHeight());
int boundW = bitMap.getWidth() - w;
int boundH = bitMap.getHeight() - h;
int start_x = boundW / 2;
int start_y = boundH / 2;
int maxBound = Math.max(boundW, boundH);
double wRatio = boundW / maxBound;
double hRatio = boundH / maxBound;
double max_r = Math.sin(0.7853981633974483D) * maxBound;
double r = 1.0D; double a = 0.0D; double a_tmp = 0.0D; double s = 1.0D; double step = 1.0D;
int x = start_x; int y = start_y;
while (r 0.7853981633974483D ? 0.7853981633974483D : s / r;
a += a_tmp;
r += step * (a_tmp / 6.283185307179586D);
x = (int)(Math.sin(a) * r * wRatio + start_x);
y = (int)(Math.cos(a) * r * hRatio + start_y);
}
return null;
}
private Rectangle2D findSpace2(BitMap bitMap, Rectangle2D rect) {
int w = pixel2bitMap((int)rect.getWidth());
int h = pixel2bitMap((int)rect.getHeight());
int[] bounds = { bitMap.getWidth() - w,
bitMap.getHeight() - h };
int[] step_len = new int[2];
int marchDir = 0;
int x;
int y;
if (bounds[0] > bounds[1]) {
int y = bounds[1] / 2;
int x = y;
bounds[0] -= bounds[1];
step_len[1] = 1;
} else {
marchDir = 3;
x = bounds[0] / 2;
y = x;
step_len[0] = 1;
bounds[1] -= bounds[0];
if (step_len[1] == 0) {
step_len[1] = 1;
}
}
int[] step = new int[4];
while (!isClean(bitMap, x, y, w, h)) {
step[marchDir] += 1;
if (step[marchDir] > step_len[(marchDir % 2)]) {
step[marchDir] = 0;
step_len[(marchDir % 2)] += 1;
marchDir++; marchDir %= 4;
if (step_len[(marchDir % 2)] > bounds[(marchDir % 2)]) {
return null;
}
}
switch (marchDir) {
case 0:
x++;
break;
case 1:
y--;
break;
case 2:
x--;
break;
case 3:
y++;
}
}
int targetX = bit2pixel(x);
int targetY = bit2pixel(y);
return new Rectangle(targetX, targetY, (int)rect.getWidth(),
(int)rect.getHeight());
}
private int pixel2bitMap(int v) {
return (int)Math.ceil(v / 4.0D);
}
private boolean isClean(BitMap bitMap, int x, int y, int w, int h) {
if ((x = bitMap.getWidth()) || (y = bitMap.getHeight()))
return false;
for (int i = x; i bi.getWidth())
r = bi.getWidth();
if (b > bi.getHeight())
b = bi.getHeight();
if ((r = bi.getWidth()) || (y2 >= bi.getHeight()))
continue;
if (bi.getRGB(x + i % 4, y + i / 4) != 0) {
bitMap.setUsed(pixel2bitMap(x), pixel2bitMap(y), true);
break;
}
}
}
public BufferedImage mixImages(BufferedImage[] images, Float[] alphas, int width, int height)
{
return mixImages(images, alphas, createBufferedImage(width, height));
}
public BufferedImage mixImages(BufferedImage[] images, Float[] alphas, BufferedImage targetImage)
{
if ((images == null) || (images.length ...");
System.out.println("\t-o:\tOutput image file name");
System.out.println("\t-b:\tBackground image file name");
System.out.println("\t-m:\tWater mark image file name");
System.out.println("\t-w:\tWidth of target image");
System.out.println("\t-h:\tHeight of target image");
System.out.println("\t-f:\tFont name");
System.exit(1);
}
if (words.size() words) throws IOException
{
BufferedReader rd = new BufferedReader(new InputStreamReader(System.in));
System.out.println("请输入词汇和词频，格式为每行一个词、一个空格、一个词频数字，以空行结束输入。");
String line = null;
while ((line = rd.readLine()) != null) {
line = line.trim();
if ("".equals(line)) {
System.out.println("好，马上处理！");
break;
}
String[] parts = line.split("\\s+");
if (parts.length != 2) continue;
try {
words.put(parts[0], Integer.valueOf(Integer.parseInt(parts[1])));
} catch (NumberFormatException e) {
System.out.println("无效的输入。");
}
}
}
}
package com.ctrip;
import java.io.IOException;
import java.io.PrintStream;
public class BitMap
{
private byte[][] bitMap;
private int width;
private int height;
private int byteWidth;
public BitMap(int width, int height)
{
if ((width = 0 ? y : 0; for (int y2 = y1 - y; (y1 = 0 ? x : 0; for (int x2 = x1 - x; (x1 = 0 ? y : 0; for (int y2 = y1 - y; (y1 = 0 ? x : 0; for (int x2 = x1 - x; (x1 = this.byteWidth) || (y = this.height))
throw new IllegalArgumentException();
int mask = 1 = this.byteWidth) || (y = this.height))
throw new IllegalArgumentException();
int mask = 1 <p>反汇编工具jd-gui</p>
<p>写了一个flex版本的，执行时间大约1~2s，效果如下：<br>
<img data-src="http://segmentfault.com/img/cJHB5O" alt="gd - php中如何获得双色图片的mask" ></p>
<p>源码layout.mxml：</p>
<pre class="brush:php;toolbar:false"><?xml version="1.0" encoding="utf-8"?>
<application xmlns:mx="http://www.adobe.com/2006/mxml" creationcomplete="onLoad();">
<style>
@font-face{
src:url("fanghei.ttf");
font-family:myFont;
}
</style>
<script>
mxmlc layout.mxml
///
import mx.controls.*;
import mx.core.*;
import mx.effects.*;
import flash.geom.Rectangle
private function clear():void
{
my_text_input_1.text="clear it!";
}
private function add_text(text_array:Array, text:String):void
{
text_array.push(text);
}
private function get_bmp_text(text:String):Bitmap
{
var metrics:TextLineMetrics;
var tempTextField:TextField = new TextField();
var tempTextFormat:TextFormat = new TextFormat();
tempTextFormat.font="myFont";
tempTextFormat.size = Math.floor(Math.random() * 40 + 20);
tempTextFormat.color = 0xff00FF;
tempTextField.width = 200;
tempTextField.height = 100;
tempTextField.embedFonts = true;
tempTextField.appendText(text);
tempTextField.setTextFormat(tempTextFormat);
metrics = tempTextField.getLineMetrics(0);
var myBitmapData:BitmapData = new BitmapData(metrics.width, metrics.height, true ,0x0000FF);
myBitmapData.draw(tempTextField);
var myBmp:Bitmap = new Bitmap(myBitmapData);
//本版本不支持rotation
//如果要支持rotation，请参考http://www.mikechambers.com/blog/2009/06/24/using-bitmapdata-hittest-for-collision-detection/
//myBmp.rotation = (Math.random() > 0.5)?0:90;
return myBmp;
}
private function add_to_canvas(result:Array, bmpText:Bitmap):Boolean
{
var last_angle:Number = 0;
var last_radius:Number = 1;
var x:int = 0;
var y:int = 0;
var center_x:int = 256;
var center_y:int = 256;
var width:int = 512;
var height:int = 512;
var conflict:Boolean = false;
while(true)
{
last_angle = last_angle + 0.1;
last_radius = last_radius + 0.1;
x = Math.floor(last_radius * Math.cos(last_angle) + center_x);
y = Math.floor(last_radius * Math.sin(last_angle) + center_y);
bmpText.x = x;
bmpText.y = y;
conflict = false;
if (result.length > 0)
{
var i:int;
for(i = 0; i ";
if (last_radius > width || last_radius > height)
{
conflict = true;
break;
}
}
}
return !conflict;
}
private function draw(result:Array):void
{
var s:Sprite = new Sprite;
var i:int;
for(i = 0; i </script>
<label text="Hello World"></label>
<label id="metrics_txt_1" text="Hello World" fontfamily="myFont"></label>
<label id="metrics_txt_2" text="Hello World"></label>
<textinput id="my_text_input_1" width="100" text=""></textinput>
<button id="my_clear_button_1" label="clear" click="clear();"></button>
<canvas backgroundcolor="0xFFFFFF" width="512" height="512" horizontalcenter="0" verticalcenter="0" id="canvas"></canvas>
</application>
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