72 lines
2.8 KiB
Kotlin
72 lines
2.8 KiB
Kotlin
package com.sw.dualscreen.view
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import android.content.Context
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import android.graphics.*
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import android.util.AttributeSet
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import android.util.Log
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import android.view.View
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import androidx.core.content.ContextCompat
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import androidx.core.graphics.toColorInt
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import kotlin.math.roundToInt
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class HollowCircleRectView @JvmOverloads constructor(
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context: Context,
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attrs: AttributeSet? = null,
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defStyleAttr: Int = 0
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) : View(context, attrs, defStyleAttr) {
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// 1. 先定义dp值，再统一转px（避免多次转换误差）
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private val rectWidthDp = 400f
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private val rectHeightDp = 510f
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private val circleRadiusDp = 200f // 直径400dp → 半径200dp（固定正圆关键）
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// 2. 转px后的值（只计算一次，避免onDraw重复计算）
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private val rectWidthPx: Float = dp2px(rectWidthDp)
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private val rectHeightPx: Float = dp2px(rectHeightDp)
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private val circleRadiusPx: Float = dp2px(circleRadiusDp)
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// 画笔和路径（复用避免重复创建）
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private val paint = Paint(Paint.ANTI_ALIAS_FLAG)
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private val path = Path()
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init {
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// paint.color = "#FFE7EFF8".toColorInt()
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paint.color = "#FFF4FAFF".toColorInt()
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paint.style = Paint.Style.FILL
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// 强制关闭硬件加速可能的渲染偏差（关键）
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setLayerType(LAYER_TYPE_SOFTWARE, null)
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}
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override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
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// 强制View尺寸为精准px值，避免父布局干扰
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val rectWidthPxInt = rectWidthPx.toInt()
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val rectHeightPxInt = rectHeightPx.toInt()
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Log.d("HollowCircleRectView", "onMeasure: $rectWidthPxInt,$rectHeightPxInt")
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setMeasuredDimension(rectWidthPxInt, rectHeightPxInt)
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}
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override fun onDraw(canvas: Canvas) {
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super.onDraw(canvas)
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path.reset()
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// 1. 添加矩形路径（精准px值，无偏差）
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path.addRect(0f, 0f, rectWidthPx, rectHeightPx, Path.Direction.CW)
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// 2. 添加圆形路径（固定半径，绝对正圆）
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val circleX = rectWidthPx / 2 // 水平居中：200dp转px
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val circleY = rectHeightPx / 2 // 垂直居中：340dp转px
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// 核心修复：用固定半径circleRadiusPx，而非直径/2（避免浮点运算偏差）
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Log.d("HollowCircleRectView", "onDraw: $circleX,$circleY,$circleRadiusPx")
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path.addCircle(circleX, circleY, circleRadiusPx, Path.Direction.CW)
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// 3. 填充规则+绘制
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path.fillType = Path.FillType.EVEN_ODD
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canvas.drawPath(path, paint)
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}
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// 精准dp转px（四舍五入避免小数偏差）
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private fun dp2px(dp: Float): Float {
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val density = context.resources.displayMetrics.density
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return (dp * density).roundToInt().toFloat() // 四舍五入到整数px
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}
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} |