如何以非锯齿方式绘制由多个线段组成的曲线

时间：2017-07-25 18:14:23

标签： canvas javafx bezier

我正在尝试编写一个程序，将传入的USB数据放到折线图上。我这样做的方法是在画布上绘制一串连接所有数据点的直线。问题是生成的线条不平滑，如下所示：

Jagged Line

我尝试使用图形上下文的lineTo(x, y)方法，但这让它变得更糟。我也尝试更改Line Cap和Line Join参数，但这并没有多大帮助。

是否有更好的游戏方式＆＃34;连接点＆＃34;使用JavaFX图形上下文？也许是贝塞尔曲线？如果有，请告诉我。

1 个答案:

答案 0 :(得分：2)

我最终选择了最简单的问题解决方案，即使用BoxBlur效果：

07-28 10:38:46.196 2560-2560/? E/libprocessgroup: failed to make and chown /acct/uid_10080: Read-only file system
07-28 10:38:46.196 2560-2560/? W/Zygote: createProcessGroup failed, kernel missing CONFIG_CGROUP_CPUACCT?
07-28 10:38:46.197 2560-2560/? I/art: Not late-enabling -Xcheck:jni (already on)
07-28 10:38:46.211 2560-2570/? E/art: Failed sending reply to debugger: Broken pipe
07-28 10:38:46.211 2560-2570/? I/art: Debugger is no longer active
07-28 10:38:46.293 2560-2560/? I/InstantRun: starting instant run server: is main process
07-28 10:38:46.334 2560-2560/? W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
07-28 10:38:46.426 2560-2583/? D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true

                                                 [ 07-28 10:38:46.427  2560: 2560 D/         ]
                                                 HostConnection::get() New Host Connection established 0xb3ee71f0, tid 2560


                                                 [ 07-28 10:38:46.428  2560: 2560 W/         ]
                                                 Unrecognized GLES max version string in extensions: ANDROID_EMU_CHECKSUM_HELPER_v1 
07-28 10:38:46.428 2560-2560/? D/Atlas: Validating map...
07-28 10:38:46.451 2560-2583/? I/OpenGLRenderer: Initialized EGL, version 1.4
07-28 10:38:46.452 2560-2583/? W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...
07-28 10:38:46.460 2560-2583/? D/EGL_emulation: eglCreateContext: 0xb3eb8940: maj 2 min 0 rcv 2
07-28 10:38:46.464 2560-2583/? D/EGL_emulation: eglMakeCurrent: 0xb3eb8940: ver 2 0
07-28 10:38:46.467 2560-2583/? D/OpenGLRenderer: Enabling debug mode 0
07-28 10:38:46.500 2560-2583/? D/EGL_emulation: eglMakeCurrent: 0xb3eb8940: ver 2 0
07-28 10:38:46.555 2560-2560/? W/art: Before Android 4.1, method int android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView
07-28 10:38:51.028 2560-2560/com.example.easypc.creatingacloneimagefrompixels D/AndroidRuntime: Shutting down VM
07-28 10:38:51.030 2560-2560/com.example.easypc.creatingacloneimagefrompixels E/AndroidRuntime: FATAL EXCEPTION: main
                                                                                                Process: com.example.easypc.creatingacloneimagefrompixels, PID: 2560
                                                                                                java.lang.IllegalStateException
                                                                                                    at android.graphics.Bitmap.setPixel(Bitmap.java:1420)
                                                                                                    at com.example.easypc.creatingacloneimagefrompixels.MainActivity$1.onClick(MainActivity.java:53)
                                                                                                    at android.view.View.performClick(View.java:4780)
                                                                                                    at android.view.View$PerformClick.run(View.java:19866)
                                                                                                    at android.os.Handler.handleCallback(Handler.java:739)
                                                                                                    at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                                    at android.os.Looper.loop(Looper.java:135)
                                                                                                    at android.app.ActivityThread.main(ActivityThread.java:5254)
                                                                                                    at java.lang.reflect.Method.invoke(Native Method)
                                                                                                    at java.lang.reflect.Method.invoke(Method.java:372)
                                                                                                    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
                                                                                                    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

这不是一个确切的解决方案，但它适用于我的目的。

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