让所有点在机器人路径 - FingerPaint.java [英] Getting all points in Path in android - FingerPaint.java
本文介绍了让所有点在机器人路径 - FingerPaint.java的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图让所有的X，被画在画布上的路径y坐标。但我不能获得积分。我得到只有几个点。这是为什么呢？
有什么办法，我可以得到所有的X和Y点？
我用FingerPaint.java为出发点。
<一个href="http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/FingerPaint.html"相对=nofollow>链接到原始FingerPaint.java
下面是code I修改和使用：
包com.schogini.whiteboard;
进口的java.util.ArrayList;
进口java.util.StringTokenizer的;
进口android.app.Activity;
进口android.content.Context;
进口android.graphics *。
进口android.os.Bundle;
进口android.util.DisplayMetrics;
进口android.util.Log;
进口android.view.Menu;
进口android.view.MenuInflater;
进口android.view.MenuItem;
进口android.view.MotionEvent;
进口android.view.View;
//进口android.widget.Toast;
公共类FingerPaint扩展活动实现ColorPickerDialog.OnColorChangedListener {
//颜色 - ARGB
INT A = 255;
INT R = 255;
INT G = 0;
INT B = 0;
//擦除标记
布尔eraseFlag = FALSE;
//上网发帖
静态字符串toSend;
静态字符串parseStr;
//阵列，用于存储X，Y，R，G，B，A
静态的ArrayList＆LT;字符串＆GT; RARRAY，gArray，bArray，alphaArray，xPointArray，yPointArray;
// ArrayList的＆LT;字符串＆GT; rArray_in，gArray_in，bArray_in，alphaArray_in，xPointArray_in，yPointArray_in;
//绘图类型
私人静电漆mPaint;
私人MaskFilter将mEmboss;
私人MaskFilter将运动模糊;
//触摸 - 路径坐标
私有静态浮动MX;
私有静态浮动我的;
// MyView的对象
MyView的米;
//点填入
浮DX，DY，距离;
INT DD，二;
@覆盖
保护无效的onCreate（包savedInstanceState）{
super.onCreate（savedInstanceState）;
M =新的MyView的（FingerPaint.this）;
的setContentView（米）;
//移动到相应的模块
RARRAY =新的ArrayList＆LT;字符串＆GT;（）;
gArray =新的ArrayList＆LT;字符串＆GT;（）;
bArray =新的ArrayList＆LT;字符串＆GT;（）;
alphaArray =新的ArrayList＆LT;字符串＆GT;（）;
xPointArray =新的ArrayList＆LT;字符串＆GT;（）;
yPointArray =新的ArrayList＆LT;字符串＆GT;（）;
mPaint =新的油漆（）;
mPaint.setAntiAlias（真正的）;
mPaint.setDither（真正的）;
mPaint.setColor（0xFFFF0000地址）;
mPaint.setStyle（Paint.Style.STROKE）;
mPaint.setStrokeJoin（Paint.Join.ROUND）;
mPaint.setStrokeCap（Paint.Cap.ROUND）;
//宽绘图刷
mPaint.setStrokeWidth（12）;
mEmboss =新EmbossMaskFilter（新的浮动[] {1，1，1}，0.4f，6，3.5F）;
运动模糊=新BlurMaskFilter（8，BlurMaskFilter.Blur.NORMAL）;
}
公共无效解析（字符串str22）{
//从服务器接收到的例子字符串
// parseStr = "255,0,0,1.0,88.0,100.0||255,0,0,1.0,88.0,101.0||255,0,0,1.0,88.0,102.0||255,0,0,1.0,88.0,103.0||255,0,0,1.0,88.0,104.0||255,0,0,1.0,88.0,105.0||255,0,0,1.0,88.0,106.0||255,0,0,1.0,88.0,107.0||255,0,0,1.0,88.0,108.0," +
// "||255,0,0,1.0,88.0,109.0||255,0,0,1.0,88.0,110.0||255,0,0,1.0,88.0,111.0||255,0,0,1.0,88.0,112.0||255,0,0,1.0,88.0,113.0||255,0,0,1.0,88.0,114.0||255,0,0,1.0,88.0,115.0||255,0,0,1.0,88.0,116.0||255,0,0,1.0,88.0,117.0," +
// "||255,0,0,1.0,88.0,118.0||255,0,0,1.0,88.0,119.0||255,0,0,1.0,88.0,120.0||255,0,0,1.0,80.0,100.0||255,0,0,1.0,81.0,100.0||255,0,0,1.0,82.0,100.0||255,0,0,1.0,83.0,100.0||255,0,0,1.0,84.0,100.0||255,0,0,1.0,85.0,100.0," +
// "||255,0,0,1.0,86.0,100.0||255,0,0,1.0,87.0,100.0||255,0,0,1.0,88.0,100.0||255,0,0,1.0,89.0,100.0||255,0,0,1.0,91.0,100.0||255,0,0,1.0,92.0,100.0||255,0,0,1.0,93.0,100.0||255,0,0,1.0,94.0,100.0||255,0,0,1.0,95.0,100.0," +
// "||255,0,0,1.0,96.0,100.0||255,0,0,1.0,97.0,100.0||255,0,0,1.0,98.0,100.0||255,0,0,1.0,99.0,100.0||255,0,0,1.0,100.0,100.0||255,0,0,1.0,101.0,100.0||255,0,0,1.0,102.0,100.0||255,0,0,1.0,103.0,100.0,";
parseStr="255,0,0,255,85.351585,90.17996||255,0,0,255,85.351585,90.17996||255,0,0,255,123.97784,80.883064||255,0,0,255,164.47311,71.58616||255,0,0,255,182.22874,65.543175||255,0,0,255,233.9381,48.3439||255,0,0,255,247.95567,42.30091||255,0,0,255,252.62822,40.441532||255,0,0,255,252.62822,40.441532||255,0,0,255,86.9091,167.34427||255,0,0,255,86.9091,167.34427||255,0,0,255,86.9091,167.34427||255,0,0,255,151.70154,133.41057||255,0,0,255,190.3278,118.07068||255,0,0,255,235.18411,98.54717||255,0,0,255,248.57867,92.03935||255,0,0,255,256.36627,89.71512||255,0,0,255,257.30078,89.250275||255,0,0,255,257.30078,89.250275||255,0,0,255,82.548065,277.97742||255,0,0,255,82.548065,277.97742||255,0,0,255,82.548065,277.97742||255,0,0,255,116.50179,258.91876||255,0,0,255,152.63605,240.7898||255,0,0,255,209.95244,215.68816||255,0,0,255,239.23363,199.41858||255,0,0,255,249.8247,192.4459||255,0,0,255,261.35028,186.86777||255,0,0,255,261.9733,186.86777||255,0,0,255,261.9733,186.86777||255,0,0,255,50.77485,53.92204||255,0,0,255,50.77485,53.92204||255,0,0,255,50.77485,53.92204||255,0,0,255,50.77485,53.92204||255,0,0,255,48.905834,62.7541||255,0,0,255,39.56077,133.87541||255,0,0,255,44.856304,185.93808||255,0,0,255,53.578365,266.82114||255,0,0,255,53.578365,287.27435||255,0,0,255,51.70935,301.6845||255,0,0,255,51.39785,303.07904||255,0,0,255,51.086346,303.5439||255,0,0,255,51.086346,303.5439||255,0,0,255,90.02411,362.57922||255,0,0,255,88.155106,355.14172||255,0,0,255,109.02575,317.0244||255,0,0,255,133.01141,323.53226||255,0,0,255,155.43958,340.26666||255,0,0,255,166.65363,344.91513||255,0,0,255,185.03226,338.4073||255,0,0,255,193.13133,326.78616||255,0,0,255,210.26395,292.38763||255,0,0,255,228.01956,296.10638||255,0,0,255,259.7928,283.09073||255,0,0,255,266.33432,263.5672||255,0,0,255,267.58032,258.91876||255,0,0,255,269.76086,256.1297||255,0,0,255,271.94138,255.20001||255,0,0,255,284.71295,248.22733||255,0,0,255,294.3695,232.42259||255,0,0,255,297.48453,212.8991||255,0,0,255,297.48453,212.8991||255,0,0,255,101.86119,202.67252||255,0,0,255,101.86119,202.67252||255,0,0,255,101.86119,202.67252||255,0,0,255,113.07527,194.77013||255,0,0,255,141.73346,178.9654||255,0,0,255,144.8485,179.43024||255,0,0,255,166.96513,192.4459||255,0,0,255,170.70317,195.23497||255,0,0,255,193.75432,195.69983||255,0,0,255,201.85338,185.93808||255,0,0,255,212.75597,146.42624||255,0,0,255,217.4285,136.19965||255,0,0,255,231.44609,135.26996||255,0,0,255,241.41415,136.66449||255,0,0,255,250.13622,136.19965||255,0,0,255,279.41742,128.76212||255,0,0,255,312.12512,100.406555||255,0,0,255,312.12512,100.406555||255,0,0,255,92.20462,52.527508||255,0,0,255,92.20462,52.527508||255,0,0,255,159.48909,44.160294||255,0,0,255,186.90128,34.398544||255,0,0,255,242.97165,20.918034||255,0,0,255,269.13785,13.48051||255,0,0,255,288.76245,11.62113||255,0,0,255,288.76245,11.62113,";
StringTokenizer的令牌=新的StringTokenizer（parseStr，||）;
而（tokens.hasMoreTokens（））
{
串秒= tokens.nextToken（）;
StringTokenizer的tempTokens =新的StringTokenizer（第二，，）;
INT索引= 0;
而（tempTokens.hasMoreTokens（））
{
串splitStr = tempTokens.nextToken（）;
开关（指数％6）{
情况下0：
rArray.add（splitStr）;
打破;
情况1：
gArray.add（splitStr）;
打破;
案例2：
bArray.add（splitStr）;
打破;
案例3：
alphaArray.add（splitStr）;
打破;
壳体4：
xPointArray.add（splitStr）;
打破;
壳体5：
yPointArray.add（splitStr）;
打破;
默认：
打破;
}
指数++;
Log.v（String44，值=+ splitStr）;
}
}
m.redraw（）;
}
公共无效colorChanged（INT颜色）{
mPaint.setColor（颜色）;
//方法整数颜色转换为R G B一
B =（颜色）及为0xFF;
G =（彩色＆GT;＆GT; 8）及0xFF的;
R =（彩色＆GT;＆GT; 16）及0xFF的;
A = Math.round（（（彩色＆GT;＆GT;＆GT; 24）/ 255）* 10）;
}
公共类MyView的扩展视图{
私人位图mBitmap;
私人帆布mCanvas;
公共道路的mpath;
市民漆mBitmapPaint;
公共MyView的（语境C）{
超级（C）;
//读取屏幕尺寸（设备独立）
DisplayMetrics displaymetrics =新DisplayMetrics（）;
。getWindowManager（）getDefaultDisplay（）getMetrics（displaymetrics）。
mBitmap = Bitmap.createBitmap（displaymetrics.widthPixels，displaymetrics.heightPixels，Bitmap.Config.ARGB_8888）;
mCanvas =新的Canvas（mBitmap）;
的mpath =新路径（）;
mBitmapPaint =新的油漆（Paint.DITHER_FLAG）;
}
@覆盖
保护无效onSizeChanged（INT W，INT小时，INT oldw，诠释oldh）{
super.onSizeChanged（W，H，oldw，oldh）;
}
@覆盖
保护无效的OnDraw（帆布油画）{
//背景 - 白色
canvas.drawColor（0xFFFFFFFF的）;
//绘制位图从0,0的firstpoint在设备的屏幕
canvas.drawBitmap（mBitmap，0，0，mBitmapPaint）;
canvas.drawPath（的mpath，mPaint）;
}
公共无效touch_start（浮X，浮动Y）{
//重新设置触摸，这样一个新的路径将被绘制
mPath.reset（）;
mPath.moveTo（X，Y）;
MX = X;
我= Y;
}
公共无效TOUCH_MOVE（浮X，浮动Y）{
mPath.quadTo（MX，MY，（X + MX）/ 2，（Y +我）/ 2）;
//点跟踪
跟踪点（（INT）X，（INT）Y，（INT）MX，（INT）我的）;
MX = X;
我= Y;
}
公共无效touch_up（）{
mPath.lineTo（MX，MY）;
//提交路径，我们的屏幕外
mCanvas.drawPath（的mpath，mPaint）;
//杀了这个，所以我们不重复抽奖
mPath.reset（）;
}
公共无效arrayPopulate（浮动ATX，浮动ATY）{
如果（eraseFlag == FALSE）{
//进入点到的ArrayList
xPointArray.add（+ ATX）;
yPointArray.add（+ ATY）;
//添加颜色，以及
alphaArray.add（+α）;
rArray.add（+ R）;
gArray.add（+ G）;
bArray.add（+ b）的;
//如果（toSend == NULL）{
// toSend =+ R +，+ G +，+ B +，+ A +，+ ATX +，+ ATY +||;
//}
// 其他{
// toSend + =+ R +，+ G +，+ B +，+ A +，+ ATX +，+ ATY +||;
//}
//数据添加到队列发送到服务器
// Log.v（接触，toSend）;
//这里将数据发送到服务器
// eraseFlag是真的结束
}
}
@覆盖
公共布尔的onTouchEvent（MotionEvent事件）{
浮X = event.getX（）;
浮动Y = event.getY（）;
开关（event.getAction（））{
案例MotionEvent.ACTION_DOWN：
touch_start（X，Y）;
arrayPopulate（X，Y）;
无效（）;
打破;
案例MotionEvent.ACTION_MOVE：
TOUCH_MOVE（X，Y）;
无效（）;
打破;
案例MotionEvent.ACTION_UP：
润色（）;
arrayPopulate（X，Y）;
无效（）;
打破;
}
返回true;
}
公共无效重绘（）{
INT ARRAYSIZE = FingerPaint.rArray.size（）;
INT索引= 0;
浮XX，YY;
//设置tPaint的性质
油漆tPaint =新的油漆（）;
tPaint.setAntiAlias（真正的）;
tPaint.setDither（真正的）;
tPaint.setStyle（Paint.Style.STROKE）;
tPaint.setStrokeJoin（Paint.Join.ROUND）;
tPaint.setStrokeCap（Paint.Cap.ROUND）;
tPaint.setColor（-16777216）;
tPaint.setStrokeWidth（12）;
而（指数＆LT; ARRAYSIZE）{
//tPaint.setARGB(Integer.parseInt(alphaArray.get(0）），的Integer.parseInt（rArray.get（0）），的Integer.parseInt（gArray.get（0）），的Integer.parseInt（bArray.get（ 0）））;
//tPaint.setColor(Color.argb(Integer.parseInt(alphaArray.get(0）），的Integer.parseInt（rArray.get（0）），的Integer.parseInt（gArray.get（0）），的Integer.parseInt（ bArray.get（0））））;
XX = Float.parseFloat（xPointArray.get（指数））;
YY = Float.parseFloat（yPointArray.get（指数））;
m.mCanvas.drawPoint（XX，YY，tPaint）;
m.invalidate（）;
指数++;
Log.d（__ REDRAW__，X =+ XX +Y =+ YY）;
}
}
}
//创建选项菜单 - 充气
@覆盖
公共布尔onCreateOptionsMenu（功能菜单）{
MenuInflater充气= getMenuInflater（）;
inflater.inflate（R.menu.menu，菜单）;
返回true;
}
//选项菜单选择 - 操作
@覆盖
公共布尔onOptionsItemSelected（菜单项项）{
mPaint.setXfermode（空）;
mPaint.setAlpha（255）;
开关（item.getItemId（））{
案例R.id.COLOR：
this.eraseFlag = FALSE;
新ColorPickerDialog（这个，这个，mPaint.getColor（））显示（）。
返回true;
案例R.id.EMBOSS：
this.eraseFlag = FALSE;
如果（mPaint.getMaskFilter（）！= mEmboss）{
mPaint.setMaskFilter（mEmboss）;
} 其他 {
mPaint.setMaskFilter（空）;
}
返回true;
案例R.id.BLUR：
this.eraseFlag = FALSE;
如果（mPaint.getMaskFilter（）！=运动模糊）{
mPaint.setMaskFilter（运动模糊）;
} 其他 {
mPaint.setMaskFilter（空）;
}
返回true;
案例R.id.ERASE：
//用于切换检测
this.eraseFlag = TRUE;
//重新设置罗嗦和放大器;浮雕
mPaint.setMaskFilter（空）;
mPaint.setXfermode（新PorterDuffXfermode（PorterDuff.Mode.CLEAR））;
返回true;
案例R.id.REDRAW：
this.eraseFlag = FALSE;
//重画绘制点
m.redraw（）;
返回true;
}
返回super.onOptionsItemSelected（项目）;
}
// Bressenham的中点算法查找任意两点---直线之间的所有点
公共无效跟踪点（INT XXX，YYY INT，INT×2，INT Y2）{
INT W = X 2 - XXX;
INT H = Y2 - YYY;
INT DX1 = 0，DY1 = 0，DX2 = 0，DY2 = 0;
如果（瓦特℃，）的dx1 = -1;否则如果（并且R w 0）的dx1 = 1;
如果（H＆小于0）DY1 = -1;否则如果（h取代; 0）DY1 = 1;
如果（瓦特℃，）DX2 = -1;否则如果（并且R w 0）DX2 = 1;
INT最长= Math.abs（瓦特）;
INT最短= Math.abs（H）;
如果（（最长＆GT;！最短））{
最长= Math.abs（H）;
最短= Math.abs（瓦特）;
如果（H＆小于0）DY2 = -1;否则如果（h取代; 0）DY2 = 1;
DX2 = 0;
}
INT分子=最长＆GT;＆GT; 1;
的for（int i = 0; I＆LT; =最长的;我++）{
m.arrayPopulate（（浮点）XXX（浮动）YYY）;
分子+ =最短;
如果（（分子＆所述;！最长））{
分子 - =最长的;
XXX + = DX1;
YYY + = DY1;
} 其他 {
XXX + = DX2;
YYY + = DY2;
}
}
}
}
解决方案
您需要进行插值找到更新的点。我建议余弦插值。它易于实施，产生像样的成绩，而且是计算上更便宜。
公共双cosineInterpolation（双X1，X2双，双正常）
{
双英尺=正常* 3.1415927;
双F =（1 - Math.cos（英尺））* 0.5;
回报X1 *（1 - F）+ X2 * F;
}
您将需要调用此方法两次;一旦用于x，一旦为2的后续点的y坐标。
I tried to get all the x,y coordinates that are drawn in the path on the canvas. But i couldn't get the points. I am getting only a few points. Why is that?
Is there any way i can get all the x and y points?
I use FingerPaint.java as a starting point.
Link to Original FingerPaint.java
Here is the code i modified and using:
package com.schogini.whiteboard;
import java.util.ArrayList;
import java.util.StringTokenizer;
import android.app.Activity;
import android.content.Context;
import android.graphics.*;
import android.os.Bundle;
import android.util.DisplayMetrics;
import android.util.Log;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
//import android.widget.Toast;
public class FingerPaint extends Activity implements ColorPickerDialog.OnColorChangedListener {
//color - ARGB
int a = 255;
int r = 255;
int g = 0;
int b = 0;
//erase Flag
boolean eraseFlag=false;
//Internet Posting
static String toSend;
static String parseStr;
//array for storing x,y,r,g,b,a
static ArrayList<String> rArray,gArray,bArray,alphaArray,xPointArray,yPointArray;
//ArrayList<String> rArray_in,gArray_in,bArray_in,alphaArray_in,xPointArray_in,yPointArray_in;
//Drawing types
private static Paint mPaint;
private MaskFilter mEmboss;
private MaskFilter mBlur;
//touch - Path Coordinates
private static float mX;
private static float mY;
//MyView object
MyView m;
//point populate
float dx,dy,distance;
int dd,ii;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
m = new MyView(FingerPaint.this);
setContentView(m);
//move to appropriate module
rArray = new ArrayList<String>();
gArray = new ArrayList<String>();
bArray = new ArrayList<String>();
alphaArray = new ArrayList<String>();
xPointArray = new ArrayList<String>();
yPointArray = new ArrayList<String>();
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(0xFFFF0000);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
//width of the drawing brush
mPaint.setStrokeWidth(12);
mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 }, 0.4f, 6, 3.5f);
mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);
}
public void parsing(String str22){
//example string received from server
// parseStr = "255,0,0,1.0,88.0,100.0||255,0,0,1.0,88.0,101.0||255,0,0,1.0,88.0,102.0||255,0,0,1.0,88.0,103.0||255,0,0,1.0,88.0,104.0||255,0,0,1.0,88.0,105.0||255,0,0,1.0,88.0,106.0||255,0,0,1.0,88.0,107.0||255,0,0,1.0,88.0,108.0," +
// "||255,0,0,1.0,88.0,109.0||255,0,0,1.0,88.0,110.0||255,0,0,1.0,88.0,111.0||255,0,0,1.0,88.0,112.0||255,0,0,1.0,88.0,113.0||255,0,0,1.0,88.0,114.0||255,0,0,1.0,88.0,115.0||255,0,0,1.0,88.0,116.0||255,0,0,1.0,88.0,117.0," +
// "||255,0,0,1.0,88.0,118.0||255,0,0,1.0,88.0,119.0||255,0,0,1.0,88.0,120.0||255,0,0,1.0,80.0,100.0||255,0,0,1.0,81.0,100.0||255,0,0,1.0,82.0,100.0||255,0,0,1.0,83.0,100.0||255,0,0,1.0,84.0,100.0||255,0,0,1.0,85.0,100.0," +
// "||255,0,0,1.0,86.0,100.0||255,0,0,1.0,87.0,100.0||255,0,0,1.0,88.0,100.0||255,0,0,1.0,89.0,100.0||255,0,0,1.0,91.0,100.0||255,0,0,1.0,92.0,100.0||255,0,0,1.0,93.0,100.0||255,0,0,1.0,94.0,100.0||255,0,0,1.0,95.0,100.0," +
// "||255,0,0,1.0,96.0,100.0||255,0,0,1.0,97.0,100.0||255,0,0,1.0,98.0,100.0||255,0,0,1.0,99.0,100.0||255,0,0,1.0,100.0,100.0||255,0,0,1.0,101.0,100.0||255,0,0,1.0,102.0,100.0||255,0,0,1.0,103.0,100.0,";
parseStr="255,0,0,255,85.351585,90.17996||255,0,0,255,85.351585,90.17996||255,0,0,255,123.97784,80.883064||255,0,0,255,164.47311,71.58616||255,0,0,255,182.22874,65.543175||255,0,0,255,233.9381,48.3439||255,0,0,255,247.95567,42.30091||255,0,0,255,252.62822,40.441532||255,0,0,255,252.62822,40.441532||255,0,0,255,86.9091,167.34427||255,0,0,255,86.9091,167.34427||255,0,0,255,86.9091,167.34427||255,0,0,255,151.70154,133.41057||255,0,0,255,190.3278,118.07068||255,0,0,255,235.18411,98.54717||255,0,0,255,248.57867,92.03935||255,0,0,255,256.36627,89.71512||255,0,0,255,257.30078,89.250275||255,0,0,255,257.30078,89.250275||255,0,0,255,82.548065,277.97742||255,0,0,255,82.548065,277.97742||255,0,0,255,82.548065,277.97742||255,0,0,255,116.50179,258.91876||255,0,0,255,152.63605,240.7898||255,0,0,255,209.95244,215.68816||255,0,0,255,239.23363,199.41858||255,0,0,255,249.8247,192.4459||255,0,0,255,261.35028,186.86777||255,0,0,255,261.9733,186.86777||255,0,0,255,261.9733,186.86777||255,0,0,255,50.77485,53.92204||255,0,0,255,50.77485,53.92204||255,0,0,255,50.77485,53.92204||255,0,0,255,50.77485,53.92204||255,0,0,255,48.905834,62.7541||255,0,0,255,39.56077,133.87541||255,0,0,255,44.856304,185.93808||255,0,0,255,53.578365,266.82114||255,0,0,255,53.578365,287.27435||255,0,0,255,51.70935,301.6845||255,0,0,255,51.39785,303.07904||255,0,0,255,51.086346,303.5439||255,0,0,255,51.086346,303.5439||255,0,0,255,90.02411,362.57922||255,0,0,255,88.155106,355.14172||255,0,0,255,109.02575,317.0244||255,0,0,255,133.01141,323.53226||255,0,0,255,155.43958,340.26666||255,0,0,255,166.65363,344.91513||255,0,0,255,185.03226,338.4073||255,0,0,255,193.13133,326.78616||255,0,0,255,210.26395,292.38763||255,0,0,255,228.01956,296.10638||255,0,0,255,259.7928,283.09073||255,0,0,255,266.33432,263.5672||255,0,0,255,267.58032,258.91876||255,0,0,255,269.76086,256.1297||255,0,0,255,271.94138,255.20001||255,0,0,255,284.71295,248.22733||255,0,0,255,294.3695,232.42259||255,0,0,255,297.48453,212.8991||255,0,0,255,297.48453,212.8991||255,0,0,255,101.86119,202.67252||255,0,0,255,101.86119,202.67252||255,0,0,255,101.86119,202.67252||255,0,0,255,113.07527,194.77013||255,0,0,255,141.73346,178.9654||255,0,0,255,144.8485,179.43024||255,0,0,255,166.96513,192.4459||255,0,0,255,170.70317,195.23497||255,0,0,255,193.75432,195.69983||255,0,0,255,201.85338,185.93808||255,0,0,255,212.75597,146.42624||255,0,0,255,217.4285,136.19965||255,0,0,255,231.44609,135.26996||255,0,0,255,241.41415,136.66449||255,0,0,255,250.13622,136.19965||255,0,0,255,279.41742,128.76212||255,0,0,255,312.12512,100.406555||255,0,0,255,312.12512,100.406555||255,0,0,255,92.20462,52.527508||255,0,0,255,92.20462,52.527508||255,0,0,255,159.48909,44.160294||255,0,0,255,186.90128,34.398544||255,0,0,255,242.97165,20.918034||255,0,0,255,269.13785,13.48051||255,0,0,255,288.76245,11.62113||255,0,0,255,288.76245,11.62113,";
StringTokenizer tokens = new StringTokenizer(parseStr, "||");
while(tokens.hasMoreTokens())
{
String second = tokens.nextToken();
StringTokenizer tempTokens = new StringTokenizer(second, ",");
int index = 0;
while(tempTokens.hasMoreTokens())
{
String splitStr = tempTokens.nextToken();
switch (index%6) {
case 0:
rArray.add(splitStr);
break;
case 1:
gArray.add(splitStr);
break;
case 2:
bArray.add(splitStr);
break;
case 3:
alphaArray.add(splitStr);
break;
case 4:
xPointArray.add(splitStr);
break;
case 5:
yPointArray.add(splitStr);
break;
default:
break;
}
index++;
Log.v("String44"," value = "+splitStr);
}
}
m.redraw();
}
public void colorChanged(int color) {
mPaint.setColor(color);
//method to convert integer color to r g b a
b = (color)&0xFF;
g = (color>>8)&0xFF;
r = (color>>16)&0xFF;
a = Math.round(((color>>>24)/255)*10);
}
public class MyView extends View {
private Bitmap mBitmap;
private Canvas mCanvas;
public Path mPath;
public Paint mBitmapPaint;
public MyView(Context c) {
super(c);
// reading screen size (for device Independence)
DisplayMetrics displaymetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displaymetrics);
mBitmap = Bitmap.createBitmap(displaymetrics.widthPixels,displaymetrics.heightPixels, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
}
@Override
protected void onDraw(Canvas canvas) {
//background -- White
canvas.drawColor(0xFFFFFFFF);
//draw the bitmap from 0,0 the firstpoint in device's screen
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(mPath, mPaint);
}
public void touch_start(float x, float y) {
//reset touch so that a new path is to be drawn
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
public void touch_move(float x, float y) {
mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
//point tracing
tracePoints((int)x, (int)y,(int)mX,(int)mY);
mX = x;
mY = y;
}
public void touch_up() {
mPath.lineTo(mX, mY);
// commit the path to our offscreen
mCanvas.drawPath(mPath, mPaint);
// kill this so we don't double draw
mPath.reset();
}
public void arrayPopulate(float atx,float aty){
if(eraseFlag==false){
//entering points into arrayLists
xPointArray.add(""+atx);
yPointArray.add(""+aty);
//add color as well
alphaArray.add(""+a);
rArray.add(""+r);
gArray.add(""+g);
bArray.add(""+b);
// if(toSend==null){
// toSend=""+r+","+g+","+b+","+a+","+atx+","+aty+"||";
// }
// else{
// toSend+=""+r+","+g+","+b+","+a+","+atx+","+aty+"||";
// }
//add data to a queue for sending to server
// Log.v("touch", toSend);
//send data here to server
//eraseFlag is true ends
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touch_start(x, y);
arrayPopulate(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touch_move(x, y);
invalidate();
break;
case MotionEvent.ACTION_UP:
touch_up();
arrayPopulate(x, y);
invalidate();
break;
}
return true;
}
public void redraw() {
int arraysize = FingerPaint.rArray.size();
int index=0;
float xx,yy;
//setting properties of tPaint
Paint tPaint= new Paint();
tPaint.setAntiAlias(true);
tPaint.setDither(true);
tPaint.setStyle(Paint.Style.STROKE);
tPaint.setStrokeJoin(Paint.Join.ROUND);
tPaint.setStrokeCap(Paint.Cap.ROUND);
tPaint.setColor(-16777216);
tPaint.setStrokeWidth(12);
while(index<arraysize){
//tPaint.setARGB(Integer.parseInt(alphaArray.get(0)), Integer.parseInt(rArray.get(0)), Integer.parseInt(gArray.get(0)), Integer.parseInt(bArray.get(0)));
//tPaint.setColor(Color.argb(Integer.parseInt(alphaArray.get(0)), Integer.parseInt(rArray.get(0)), Integer.parseInt(gArray.get(0)), Integer.parseInt(bArray.get(0))));
xx=Float.parseFloat(xPointArray.get(index));
yy=Float.parseFloat(yPointArray.get(index));
m.mCanvas.drawPoint(xx,yy,tPaint);
m.invalidate();
index++;
Log.d("__REDRAW__", "X="+xx+" Y="+yy);
}
}
}
//creating Options Menu - Inflater
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
return true;
}
//Option Menu Selection - Actions
@Override
public boolean onOptionsItemSelected(MenuItem item) {
mPaint.setXfermode(null);
mPaint.setAlpha(255);
switch (item.getItemId()) {
case R.id.COLOR:
this.eraseFlag=false;
new ColorPickerDialog(this, this, mPaint.getColor()).show();
return true;
case R.id.EMBOSS:
this.eraseFlag=false;
if (mPaint.getMaskFilter() != mEmboss) {
mPaint.setMaskFilter(mEmboss);
} else {
mPaint.setMaskFilter(null);
}
return true;
case R.id.BLUR:
this.eraseFlag=false;
if (mPaint.getMaskFilter() != mBlur) {
mPaint.setMaskFilter(mBlur);
} else {
mPaint.setMaskFilter(null);
}
return true;
case R.id.ERASE:
//for toggle detection
this.eraseFlag=true;
//reset blurr & Emboss
mPaint.setMaskFilter(null);
mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
return true;
case R.id.REDRAW:
this.eraseFlag=false;
//redraw the drawn points
m.redraw();
return true;
}
return super.onOptionsItemSelected(item);
}
//Bressenham's mid-point algorithm for finding all points between any two points --- Straight line
public void tracePoints(int xxx,int yyy,int x2, int y2) {
int w = x2 - xxx ;
int h = y2 - yyy ;
int dx1 = 0, dy1 = 0, dx2 = 0, dy2 = 0 ;
if (w<0) dx1 = -1 ; else if (w>0) dx1 = 1 ;
if (h<0) dy1 = -1 ; else if (h>0) dy1 = 1 ;
if (w<0) dx2 = -1 ; else if (w>0) dx2 = 1 ;
int longest = Math.abs(w) ;
int shortest = Math.abs(h) ;
if (!(longest>shortest)) {
longest = Math.abs(h) ;
shortest = Math.abs(w) ;
if (h<0) dy2 = -1 ; else if (h>0) dy2 = 1 ;
dx2 = 0 ;
}
int numerator = longest >> 1 ;
for (int i=0;i<=longest;i++) {
m.arrayPopulate((float)xxx,(float)yyy) ;
numerator += shortest ;
if (!(numerator<longest)) {
numerator -= longest ;
xxx += dx1 ;
yyy += dy1 ;
} else {
xxx += dx2 ;
yyy += dy2 ;
}
}
}
}
解决方案
You need to interpolate to find the points between updates. I recommend cosine interpolation. Its easy to implement, produces decent results, and is computationally inexpensive.
public double cosineInterpolation(double x1, double x2, double normal)
{
double ft = normal * 3.1415927;
double f = (1 - Math.cos(ft)) * .5;
return x1 * (1 - f) + x2 * f;
}
You'll need to call this method twice; once for the x, and once for the y coordinates of 2 subsequent points.
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