135 lines
4.9 KiB
Go
135 lines
4.9 KiB
Go
package pixel
|
|
|
|
import "image/color"
|
|
|
|
// Target is something that can be drawn onto, such as a window, a canvas, and so on.
|
|
//
|
|
// You can notice, that there are no "drawing" methods in a Target. That's because all drawing
|
|
// happens indirectly through Triangles instance generated via MakeTriangles method.
|
|
type Target interface {
|
|
// MakeTriangles generates a specialized copy of the provided Triangles.
|
|
//
|
|
// When calling Draw method on the returned TargetTriangles, the TargetTriangles will be
|
|
// drawn onto the Target that generated them.
|
|
//
|
|
// Note, that not every Target has to recognize all possible types of Triangles. Some may
|
|
// only recognize TrianglesPosition and TrianglesColor and ignore all other properties (if
|
|
// present) when making new TargetTriangles. This varies from Target to Target.
|
|
MakeTriangles(Triangles) TargetTriangles
|
|
|
|
// MakePicture generates a specialized copy of the provided Picture.
|
|
//
|
|
// When calling Draw method on the returned TargetPicture, the TargetPicture will be drawn
|
|
// onto the Target that generated it together with the TargetTriangles supplied to the Draw
|
|
// method.
|
|
MakePicture(Picture) TargetPicture
|
|
}
|
|
|
|
// BasicTarget is a Target with additional basic "adjustment" methods.
|
|
type BasicTarget interface {
|
|
Target
|
|
|
|
// SetTransform sets a Transform that transforms the TrianglesPosition property of all
|
|
// Triangles.
|
|
SetTransform(...Transform)
|
|
|
|
// SetMColorMask sets a color that will be multiplied with the TrianglesColor property of all
|
|
// Triangles.
|
|
SetColorMask(color.Color)
|
|
}
|
|
|
|
// Triangles represents a list of vertices, where each three vertices form a triangle. (First,
|
|
// second and third is the first triangle, fourth, fifth and sixth is the second triangle, etc.)
|
|
type Triangles interface {
|
|
// Len returns the number of vertices. The number of triangles is the number of vertices
|
|
// divided by 3.
|
|
Len() int
|
|
|
|
// SetLen resizes Triangles to len vertices. If Triangles B were obtained by calling Slice
|
|
// method on Triangles A, the relationship between A and B is undefined after calling SetLen
|
|
// on either one of them.
|
|
SetLen(len int)
|
|
|
|
// Slice returns a sub-Triangles of this Triangles, covering vertices in range [i, j).
|
|
//
|
|
// If Triangles B were obtained by calling Slice(4, 9) on Triangles A, then A and B must
|
|
// share the same underlying data. Modifying B must change the contents of A in range
|
|
// [4, 9). The vertex with index 0 at B is the vertex with index 4 in A, and so on.
|
|
//
|
|
// Returned Triangles must have the same underlying type.
|
|
Slice(i, j int) Triangles
|
|
|
|
// Update copies vertex properties from the supplied Triangles into this Triangles.
|
|
//
|
|
// Properies not supported by these Triangles should be ignored. Properties not supported by
|
|
// the supplied Triangles should be left untouched.
|
|
//
|
|
// The two Triangles need to have the same Len.
|
|
Update(Triangles)
|
|
|
|
// Copy creates an exact independent copy of this Triangles (with the same underlying type).
|
|
Copy() Triangles
|
|
}
|
|
|
|
// TargetTriangles are Triangles generated by a Target with MakeTriangles method. They can be drawn
|
|
// onto that (no other) Target.
|
|
type TargetTriangles interface {
|
|
Triangles
|
|
|
|
// Draw draws Triangles onto an associated Target.
|
|
Draw()
|
|
}
|
|
|
|
// TrianglesPosition specifies Triangles with Position property.
|
|
type TrianglesPosition interface {
|
|
Triangles
|
|
Position(i int) Vec
|
|
}
|
|
|
|
// TrianglesColor specifies Triangles with Color property.
|
|
type TrianglesColor interface {
|
|
Triangles
|
|
Color(i int) NRGBA
|
|
}
|
|
|
|
// TrianglesPicture specifies Triangles with Picture propery.
|
|
//
|
|
// Note that this represents picture coordinates, not an actual picture.
|
|
type TrianglesPicture interface {
|
|
Triangles
|
|
Picture(i int) Vec
|
|
}
|
|
|
|
// Picture represents a rectangular area of raster data, such as a color. It has Bounds which
|
|
// specify the rectangle where data is located.
|
|
type Picture interface {
|
|
// Bounds returns the rectangle of the Picture. All data is located witih this rectangle.
|
|
// Querying properties outside the rectangle should return default value of that property.
|
|
Bounds() Rect
|
|
|
|
// Slice returns a sub-Picture with specified Bounds.
|
|
Slice(Rect) Picture
|
|
}
|
|
|
|
// TargetPicture is a Picture generated by a Target using MakePicture method. This Picture can be drawn onto
|
|
// that (no other) Target together with a TargetTriangles generated by the same Target.
|
|
//
|
|
// The TargetTriangles specify where, shape and how the Picture should be drawn.
|
|
type TargetPicture interface {
|
|
Picture
|
|
|
|
// Draw draws the supplied TargetTriangles (which must be generated by the same Target as
|
|
// this TargetPicture) with this TargetPicture. The TargetTriangles should utilize the data
|
|
// from this TargetPicture in some way.
|
|
Draw(TargetTriangles)
|
|
}
|
|
|
|
// PictureColor specifies Picture with Color property, so that every position inside the Picture's
|
|
// Bounds has a color.
|
|
//
|
|
// Positions outside the Picture's Bounds must return transparent black (NRGBA{R: 0, G: 0, B: 0, A: 0}).
|
|
type PictureColor interface {
|
|
Picture
|
|
Color(at Vec) NRGBA
|
|
}
|