Android 画布canvas drawBitmap(Bitmap bitmap, float left, float top, Paint paint)

void    drawBitmap(Bitmap bitmap, float left, float top, Paint paint)
Draw the specified bitmap, with its top/left corner at (x,y), using the specified paint, transformed by the current matrix.

这个方法从（x,y）这个点绘制位图意思。没有返回值，参数有三个，分别是：

Bitmap bitmap：要绘制的位图

float left：绘制的位图左侧的位置

float top：绘制的位图顶部的位置

Paint paint：用于绘制位图的画布（可以为null）

如何使用：

需求：从（0，100）这个点去绘制位图。

关键代码：

 canvas?.drawBitmap(mBitmap,0f,100f, mPaint)

完整代码：

package com.lxm.apipro.canvas.d8

import android.content.Context
import android.graphics.*
import android.util.AttributeSet
import android.view.View


class CanvasView : View {
    private var mContext: Context? = null
    private var mBitmap: Bitmap =
        BitmapFactory.decodeResource(resources, com.lxm.apipro.R.drawable.pic1)
    private var mPaint: Paint = Paint()

    constructor(context: Context?) : this(context, null)
    constructor(context: Context?, attrs: AttributeSet?) : this(context, attrs, 0)
    constructor(context: Context?, attrs: AttributeSet?, defStyleAttr: Int) : super(
        context,
        attrs,
        defStyleAttr
    ) {
        mContext = context


    }

    init {
        mPaint.isAntiAlias = true
        mPaint.color = Color.RED
        mPaint.style = Paint.Style.STROKE
        mPaint.strokeWidth = 5f
    }

    override fun onDraw(canvas: Canvas?) {
        super.onDraw(canvas)
        canvas?.save()
        canvas?.drawBitmap(mBitmap,0f,100f, mPaint)
        canvas?.restore()

    }

}

效果图：