自定义控件（8）---PathEffect平滑曲线--点、线、矩形、圆

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#FFFFFF"
android:orientation="vertical" >

<com.aigestudio.customviewdemo.views.PathEffectView
android:layout_width="match_parent"
android:layout_height="match_parent" />

</LinearLayout>

MeasureUtil

package com.aigestudio.customviewdemo.utils;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.Color;
import android.util.DisplayMetrics;

public final class MeasureUtil {
public static int[] getScreenSize(Activity activity) {
DisplayMetrics metrics = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
return new int[] { metrics.widthPixels, metrics.heightPixels };
}

}

MainActivity

package com.aigestudio.customviewdemo.activities;

import android.app.Activity;
import android.os.Bundle;

import com.aigestudio.customviewdemo.R;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
}

PathEffectView

package com.aigestudio.customviewdemo.views;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.CornerPathEffect;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PathEffect;
import android.util.AttributeSet;
import android.view.View;

/**
* PathEffect
*/
@SuppressLint({ "NewApi", "DrawAllocation" })
public class PathEffectView extends View {
private Paint mPaint;// 画笔对象
private Path mPath;// 路径对象
private PathEffect mEffects;// 路径效果数组

public PathEffectView(Context context, AttributeSet attrs) {
super(context, attrs);

/*
* 实例化画笔并设置属性
* 描边、宽度、颜色
*/
mPaint = new Paint();
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(5);
mPaint.setColor(Color.DKGRAY);

// 实例化路径
mPath = new Path();

// 定义路径的起点
mPath.moveTo(0, 420);

// 定义路径的各个点
for (int i = 0; i <= 30; i++) {
mPath.lineTo(i * 35, (float) (Math.random() * 300));
}

// 创建路径效果数组
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);

/*
* 实例化各类特效
*/
mEffects = new CornerPathEffect(50);

/*
* 绘制路径
*/
mPaint.setPathEffect(mEffects);
canvas.drawPath(mPath, mPaint);

// 刷新偏移值并重绘视图实现动画效果
invalidate();
}
}

========================================



activity_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/root"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.try_paint_blog.MainActivity" >

</FrameLayout>

MainActivity

package com.example.try_paint_blog;

import android.app.Activity;
import android.os.Bundle;
import android.widget.FrameLayout;

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

FrameLayout root=(FrameLayout)findViewById(R.id.root);
root.addView(new MyView(MainActivity.this));
}

}

MyView

package com.example.try_paint_blog;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.Style;
import android.graphics.Path;
import android.graphics.Rect;
import android.graphics.RectF;
import android.view.View;

public class MyView extends View {

Context m_context;

public MyView(Context context) {
super(context);

m_context = context;
}

// 重写OnDraw（）函数，在每次重绘时自主实现绘图
@SuppressLint("DrawAllocation")
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);

Paint paint = new Paint();
paint.setColor(Color.RED); // 设置画笔颜色
paint.setStyle(Style.FILL);// 设置填充样式
paint.setStrokeWidth(5);// 设置画笔宽度
// 画直线
canvas.drawLine(0, 10, 100, 10, paint);

// 两两一直线
float[] pts = { 0, 50, 20, 50, 40, 50, 60, 50 };
canvas.drawLines(pts, paint);
// 画点
canvas.drawPoint(100, 100, paint);

// 多个点float drawPoints里路过前两个数值，即第一个点横纵坐标，画出后面四个数值代表的点，即第二，第三个点
float[] ptss = { 200, 100, 300, 100, 400, 100, 500, 100 };
canvas.drawPoints(ptss, 2, 4, paint);

// 矩形
canvas.drawRect(0, 200, 100, 300, paint);// 直接构造

RectF rect = new RectF(150, 200, 250, 300);
canvas.drawRect(rect, paint);// 使用RectF构造

Rect rect2 = new Rect(300, 200, 400, 300);
canvas.drawRect(rect2, paint);// 使用Rect构造
// 圆角
RectF rect3 = new RectF(0, 350, 200, 450);
canvas.drawRoundRect(rect3, 20, 20, paint);
// 圆
canvas.drawCircle(400, 400, 50, paint);

// 三角形
paint.setStyle(Style.STROKE);// 填充样式改为描边
Path path = new Path();
path.moveTo(10, 500); // 设定起始点
path.lineTo(10, 600);// 第一条直线的终点，也是第二条直线的起点
path.lineTo(50, 600);// 画第二条直线
path.close();// 闭环

canvas.drawPath(path, paint);
}

}