76 lines
1.5 KiB
Go
76 lines
1.5 KiB
Go
package ox
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import "surdeus.su/core/gg"
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import "surdeus.su/core/gg/mx"
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// Default camera implementation.
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type Camera struct {
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ObjectImpl
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// The Transform to interact with
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// to change camera position, rotation etc.
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Transform
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// The shaders that will be applied to everything
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// that the camera shows.
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Shaderity
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// The bufferization implementation
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// to keep everything fast.
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absMatrice realMatrice
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}
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// Returns the new camera
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// with default settings.
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func NewCamera() *Camera {
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ret := &Camera{}
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ret.Transform = T()
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return ret
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}
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// Returns the matrix satysfying camera
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// position, scale and rotation to apply
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// it to the objects to get the real
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// transform to display on the screen.
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func (c *Camera) GetRealMatrice(ctx gg.Context) mx.Matrice {
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// Bufferization
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// so we do not need to recalculate
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// Transform again.
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if !c.Transform.Dirty() {
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return c.realMatrice
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}
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var g mx.Matrice
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position := c.GetPosition().Neg()
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around := c.GetAround()
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scale := c.GetScale()
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rotation := c.GetRotation()
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g.Translate(-position.X, -position.Y)
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g.Rotate(rotation)
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size := ctx.Engine.AbsWinSize()
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g.Translate(around.X * size.X, around.Y * size.Y)
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g.Scale(scale.X, scale.Y)
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c.realMatrice = g
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return g
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}
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// The matrix to convert things into the
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// inside engine representation,
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// get the position of cursor inside the world
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// basing on its window position.
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func (c *Camera) GetAbsMatrice(ctx gg.Context) mx.Matrice {
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if !c.Transform.Dirty() {
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return c.absMatrice
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}
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m := c.GetRealMatrice(ctx)
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m.Invert()
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c.absMatrice = m
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return m
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}
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