如何将 android.graphics.Color 转换为 androidx.compose.ui.graphics.Color [英] How to convert android.graphics.Color to androidx.compose.ui.graphics.Color

问题描述

我正在画一个 JetpackCompose Canvas

I'm drawing a JetpackCompose Canvas

    Canvas(modifier = modifier.clipToBounds()) {
        val colorEvaluator = ArgbEvaluator()
        colorEvaluator.evaluate(t, Color.Red, Color.Blue)
        drawCircle(
            style = Stroke(8.dp.toPx()),
            color = AndroidColor.valueOf(colorEvaluator.evaluate(t, Color.Red, Color.Blue) as Int),
            center = Offset(size.minDimension/2 , size.minDimension/2),
            radius = size.minDimension * t)
        drawRect(
            color = darkColor,
            style = Stroke(16.dp.toPx()),
        )
    }

哪里

import androidx.compose.ui.graphics.Color
import android.graphics.Color as AndroidColor

我在 color = AndroidColor.valueOf(colorEvaluator.evaluate(t, Color.Red, Color.Blue) as Int) 上遇到这个错误， 错误信息是

Type mismatch.
Required:
androidx.compose.ui.graphics.Color
Found:
android.graphics.Color

推荐答案

看起来我应该将 AndroidColor.RED 和 AndroidColor.BLUE 提供给 ArgbEvaluator 而不是意外使用Compose

Looks like I should supply AndroidColor.RED and AndroidColor.BLUE to the ArgbEvaluator instead of accidentally use the Color of Compose

其中 AndroidColor 是 import android.graphics.Color as AndroidColor

    Canvas(modifier = modifier.clipToBounds()) {
        drawCircle(
            style = Stroke(8.dp.toPx()),
            color = Color(ArgbEvaluator().evaluate(t, AndroidColor.RED, AndroidColor.BLUE) as Int),
            center = Offset(size.minDimension / 2, size.minDimension / 2),
            radius = size.minDimension * t
        )
        drawRect(
            color = darkColor,
            style = Stroke(16.dp.toPx()),
        )
    }

更新

找到了一个更好的方法，就是按照下面的代码在compose中使用lerp.使用这种方法，我们不再需要使用旧的 ArgbEvaluator.

Found an even better approach, that is to use lerp in compose as per the below code. Using this approach, we no longer need to use the old ArgbEvaluator.

    Canvas(modifier = modifier.clipToBounds()) {
        drawCircle(
            style = Stroke(8.dp.toPx()),
            color = lerp(Color.Red, Color.Blue, t),
            center = Offset(size.minDimension / 2, size.minDimension / 2),
            radius = size.minDimension * t
        )
        drawRect(
            color = darkColor,
            style = Stroke(16.dp.toPx()),
        )
    }

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