mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-21 22:02:23 +02:00
47 lines
1.3 KiB
Go
47 lines
1.3 KiB
Go
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// Copyright 2016 The Ebiten Authors
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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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// +build js
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package ebiten
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import (
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"github.com/gopherjs/gopherjs/js"
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)
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// Element returns a value of a matrix at (i, j).
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func (c *ColorM) Element(i, j int) float64 {
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if c.values == "" {
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if i == j {
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return 1
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}
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return 0
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}
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a := js.NewArrayBuffer([]uint8(c.values))
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af64 := js.Global.Get("Float64Array").New(a)
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return af64.Index(i*ColorMDim + j).Float()
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}
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// SetElement sets an element at (i, j).
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func (c *ColorM) SetElement(i, j int, value float64) {
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if c.values == "" {
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c.values = colorMIdentityValue
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}
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a := js.NewArrayBuffer([]uint8(c.values))
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a8 := js.Global.Get("Uint8Array").New(a)
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af64 := js.Global.Get("Float64Array").New(a)
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af64.SetIndex(i*ColorMDim+j, value)
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c.values = string(a8.Interface().([]uint8))
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}
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