41 lines
1.1 KiB
Go
41 lines
1.1 KiB
Go
// Copyright 2023 The casbin Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package util
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import (
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"fmt"
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"image/color"
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"math"
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"math/rand"
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)
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func mixChannel(a uint8, b uint8, t float64) uint8 {
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i := (1-t)*float64(a)*float64(a) + t*float64(b)*float64(b)
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return uint8(math.Sqrt(i))
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}
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func MixColor(c1 color.RGBA, c2 color.RGBA, t float64) color.RGBA {
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res := color.RGBA{
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R: mixChannel(c1.R, c2.R, t),
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G: mixChannel(c1.G, c2.G, t),
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B: mixChannel(c1.B, c2.B, t),
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}
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return res
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}
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func GetRandomColor() string {
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return fmt.Sprintf("rgb(%d,%d,%d)", rand.Intn(256), rand.Intn(256), rand.Intn(256))
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}
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