73 lines
2.4 KiB
Go
73 lines
2.4 KiB
Go
package pixel
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import "image/color"
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// Target is something that can be drawn onto, such as a window, a canvas, and so on.
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//
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// You can notice, that there are no "drawing" methods in a Target. That's because all drawing
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// happens indirectly through Triangles instance generated via MakeTriangles method.
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type Target interface {
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// MakeTriangles generates a specialized copy of the provided Triangles.
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//
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// When calling Draw method on the returned Triangles, the Triangles will be drawn onto the
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// target that generated them.
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//
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// Note, that not every Target has to recognize all possible types of triangles. Some may
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// only recognize TrianglesPosition and TrianglesColor and ignore all other properties (if
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// present) when making new Triangles. This varies from Target to Target.
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MakeTriangles(Triangles) Triangles
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// These are the most basic Target "adjustment" methods.
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SetPicture(*Picture)
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SetTransform(...Transform)
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SetMaskColor(color.Color)
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}
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// Triangles represents a list of vertices, where each three vertices form a triangle. (First,
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// second and third is the first triangle, fourth, fifth and sixth is the second triangle, etc.)
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type Triangles interface {
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// Len returns the number of vertices. The number of triangles is the number of vertices
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// divided by 3.
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Len() int
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// Draw draws Triangles onto an associated Target (if any).
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//
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// Note, that this method does not have to be implemented, however it is always implemented
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// for Triangles generated by a Target.
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Draw()
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// Update copies vertex properties from the supplied Triangles into this Triangles.
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//
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// Properies not supported by these Triangles should be ignored. Properties not supported by
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// the supplied Triangles should be left untouched.
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//
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// If these Triangles and supplied Triangles have different lengths, these Triangles should
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// be resized.
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Update(Triangles)
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}
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// Drawer is something that can be drawn onto any Target.
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type Drawer interface {
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Draw(Target)
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}
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// TrianglesPosition specifies Triangles with Position property.
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type TrianglesPosition interface {
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Triangles
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Position(i int) Vec
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}
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// TrianglesColor specifies Triangles with Color property.
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type TrianglesColor interface {
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Triangles
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Color(i int) color.Color
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}
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// TrianglesTexture specifies Triangles with Texture propery.
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//
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// Note that this represents texture coordinates, not an actual texture.
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type TrianglesTexture interface {
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Triangles
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Texture(i int) Vec
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}
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