河北网站优化公司,网上商城都有哪些平台,网站建设的合同书,烟台论坛Android基于Matrix绘制PaintDrawable设置BitmapShader#xff0c;以手指触点为中心显示原图像圆图#xff0c;Kotlin#xff08;2#xff09; 在 https://zhangphil.blog.csdn.net/article/details/135374279 基础上#xff0c;增加一个功能#xff0c;当手指在上面的图片…Android基于Matrix绘制PaintDrawable设置BitmapShader以手指触点为中心显示原图像圆图Kotlin2 在 https://zhangphil.blog.csdn.net/article/details/135374279 基础上增加一个功能当手指在上面的图片上滑动时候显示滑动轨迹 import android.content.Context
import android.graphics.Bitmap
import android.graphics.BitmapShader
import android.graphics.Canvas
import android.graphics.Color
import android.graphics.Matrix
import android.graphics.Paint
import android.graphics.Path
import android.graphics.Shader.TileMode
import android.graphics.drawable.BitmapDrawable
import android.graphics.drawable.PaintDrawable
import android.os.Bundle
import android.util.AttributeSet
import android.util.Log
import android.view.MotionEvent
import android.widget.ImageView
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.AppCompatImageViewclass MainActivity : AppCompatActivity() {private var iv: MyImageView? nulloverride fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)setContentView(R.layout.activity_main)iv findViewById(R.id.iv)val r findViewByIdImageView(R.id.result)iv?.setTestImageView(r)}
}class MyImageView : AppCompatImageView {private var mCurX 0private var mCurY 0private val mPath Path()private val mPathPaint Paint()private var mNewBmp: Bitmap? nullprivate var mSrcBmp: Bitmap? nullprivate var mIsDraw falseprivate val mRadius 300fprivate var mDrawable: PaintDrawable? nullprivate var testIV: ImageView? nullconstructor(ctx: Context, attrs: AttributeSet) : super(ctx, attrs) {mSrcBmp (drawable as BitmapDrawable).bitmapmPathPaint.style Paint.Style.STROKEmPathPaint.strokeWidth 15fmPathPaint.isAntiAlias truemPathPaint.color Color.RED}fun setTestImageView(iv: ImageView?) {testIV iv}override fun onTouchEvent(event: MotionEvent): Boolean {mCurX event.x.toInt()mCurY event.y.toInt()when (event.action) {MotionEvent.ACTION_DOWN - {Log.d(fly, 开始绘制)mPath.moveTo(event.x, event.y)mIsDraw true}MotionEvent.ACTION_MOVE - {mPath.lineTo(event.x, event.y)}MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL - {Log.d(fly, 不需绘制)mIsDraw false//抬手后清除手指轨迹。myClear()}}invalidate()return true}private fun myClear() {//清除历史轨迹。mPath.reset()}override fun onDraw(canvas: Canvas) {super.onDraw(canvas)if (mIsDraw) {myDraw()canvas.drawPath(mPath, mPathPaint)}}private fun myDraw() {val shader BitmapShader(Bitmap.createScaledBitmap(mSrcBmp!!, this.width, this.height, true), TileMode.DECAL, TileMode.DECAL)mDrawable PaintDrawable(Color.DKGRAY)mDrawable!!.setCornerRadius(mRadius / 2) //圆角矩形如果不除2即是圆形框图。mDrawable!!.paint.shader shadermDrawable!!.setBounds(0, 0, (mRadius * 2).toInt(), (mRadius * 2).toInt())mNewBmp Bitmap.createBitmap(this.width, this.height, Bitmap.Config.ARGB_8888)val c Canvas(mNewBmp!!)c.drawColor(Color.LTGRAY) //画满底色。val matrix Matrix()matrix.setTranslate(-mCurX mRadius, -mCurY mRadius)mDrawable!!.paint.shader.setLocalMatrix(matrix)mDrawable!!.draw(c)testIV?.setImageBitmap(mNewBmp)}
}?xml version1.0 encodingutf-8?
LinearLayout xmlns:androidhttp://schemas.android.com/apk/res/androidxmlns:toolshttp://schemas.android.com/toolsandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentandroid:backgroundandroid:color/darker_grayandroid:orientationverticaltools:context.MainActivitycom.pkg.MyImageViewandroid:idid/ivandroid:layout_widthmatch_parentandroid:layout_heightwrap_contentandroid:adjustViewBoundstrueandroid:backgrounddrawable/ic_launcher_backgroundandroid:scaleTypefitCenterandroid:srcmipmap/mypic /ImageViewandroid:idid/resultandroid:layout_widthwrap_contentandroid:layout_heightwrap_contentandroid:layout_marginTop20dpandroid:backgrounddrawable/ic_launcher_backgroundandroid:srcdrawable/ic_launcher_foreground //LinearLayout https://zhangphil.blog.csdn.net/article/details/135374279https://zhangphil.blog.csdn.net/article/details/135374279
