33 lines
639 B
Go
33 lines
639 B
Go
package gg
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// Implements the camera component
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// for the main window.
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type Camera struct {
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Transform
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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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// (Should implement buffering it so we do not
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// need to calculate it each time for each object. )
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func (c *Camera)RealMatrix(
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e *Engine,
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) Matrix {
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g := &Matrix{}
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g.Translate(-c.P.X, -c.P.Y)
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g.Rotate(c.R)
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g.Scale(c.S.X, c.S.Y)
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g.Translate(c.RA.X, c.RA.Y)
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return *g
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}
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func (c *Camera) AbsMatrix(
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e *Engine,
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) Matrix {
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m := c.RealMatrix(e)
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m.Invert()
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return m
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}
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