mirror of
https://github.com/hajimehoshi/ebiten.git
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88 lines
2.4 KiB
Go
88 lines
2.4 KiB
Go
// Copyright 2013 Hajime Hoshi
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package matrix
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import (
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"math"
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)
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const geometryDim = 3
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type Geometry struct {
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Elements [geometryDim - 1][geometryDim]float64
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}
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func IdentityGeometry() Geometry {
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return Geometry{
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[geometryDim - 1][geometryDim]float64{
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{1, 0, 0},
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{0, 1, 0},
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},
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}
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}
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func (matrix *Geometry) Dim() int {
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return geometryDim
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}
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func (matrix *Geometry) Concat(other Geometry) {
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result := Geometry{}
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mul(&other, matrix, &result)
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*matrix = result
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}
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func (matrix *Geometry) IsIdentity() bool {
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return isIdentity(matrix)
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}
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func (matrix *Geometry) element(i, j int) float64 {
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return matrix.Elements[i][j]
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}
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func (matrix *Geometry) setElement(i, j int, element float64) {
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matrix.Elements[i][j] = element
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}
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func (matrix *Geometry) Translate(tx, ty float64) {
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matrix.Elements[0][2] += tx
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matrix.Elements[1][2] += ty
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}
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func (matrix *Geometry) Scale(x, y float64) {
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matrix.Elements[0][0] = x * matrix.Elements[0][0]
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matrix.Elements[0][1] = x * matrix.Elements[0][1]
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matrix.Elements[0][2] = x * matrix.Elements[0][2]
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matrix.Elements[1][0] = y * matrix.Elements[1][0]
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matrix.Elements[1][1] = y * matrix.Elements[1][1]
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matrix.Elements[1][2] = y * matrix.Elements[1][2]
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}
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func (matrix *Geometry) Rotate(theta float64) {
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sin, cos := math.Sincos(theta)
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rotate := Geometry{
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[2][3]float64{
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{cos, -sin, 0},
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{sin, cos, 0},
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},
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}
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matrix.Concat(rotate)
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}
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