Sander Schobers
cdfb863ab0
Added Action{,s}. List of actions that can be used to defer cleanup code (see NewRenderer implementations).
Added TextInputEvent (replaces the old KeyPressEvent) and added to new events KeyDown & KeyUp.
Added VSync to NewRendererOptions.
Removed IconScale from button.
Added ImageSource interface that replaces the Image/Texture method on the Texture interface. This makes converting back a texture to an image optional (since this is atypical for a hardware texture for instance).
Added new KeyModifier: OSCommand (Windows/Command key).
Added KeyState that can keep the state of keys (pressed or not).
Added KeyEnter, representing the Enter key.
Changed signatures of CreateTexture methods in Renderer.
Changed signatures of icon related method (removed factories).
Basic example now depends on sdlgui.
110 lines
2.5 KiB
Go
110 lines
2.5 KiB
Go
package ui
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import (
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"image"
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"image/color"
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"opslag.de/schobers/geom"
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)
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type AlphaPixelImageSource struct {
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ImageAlphaPixelTestFn
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Size geom.Point
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}
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func (s *AlphaPixelImageSource) CreateImage() (image.Image, error) {
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return DrawImageAlpha(s.Size, s.ImageAlphaPixelTestFn), nil
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}
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type ImageAlphaPixelTestFn func(geom.PointF32) uint8
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func (f ImageAlphaPixelTestFn) CreateImageSource(size geom.Point) ImageSource {
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return &AlphaPixelImageSource{f, size}
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}
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type ImagePixelTestFn func(geom.PointF32) bool
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func (f ImagePixelTestFn) CreateImageSource(size geom.Point) ImageSource {
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return &PixelImageSource{f, size}
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}
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func createTexture(ctx Context, source ImageSource) Texture {
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texture, err := ctx.Renderer().CreateTexture(source)
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if err != nil {
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return nil
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}
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return texture
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}
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func CreateIcon(ctx Context, test ImagePixelTestFn) Texture {
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return createTexture(ctx, test.CreateImageSource(IconSize()))
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}
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func CreateTexture(ctx Context, size geom.Point, test ImagePixelTestFn) Texture {
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return createTexture(ctx, test.CreateImageSource(size))
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}
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func CreateTextureAlpha(ctx Context, size geom.Point, test ImageAlphaPixelTestFn) Texture {
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return createTexture(ctx, test.CreateImageSource(size))
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}
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func DrawIcon(test ImagePixelTestFn) image.Image {
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size := IconSize()
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return DrawImage(size, test)
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}
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func DrawImage(size geom.Point, test ImagePixelTestFn) image.Image {
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r := image.Rect(0, 0, size.X, size.Y)
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icon := image.NewRGBA(r)
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for y := 0; y < size.Y; y++ {
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for x := 0; x < size.X; x++ {
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pt := geom.PtF32(float32(x), float32(y))
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if test(pt) {
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icon.Set(x, y, color.White)
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}
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}
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}
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return icon
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}
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func DrawImageAlpha(size geom.Point, test ImageAlphaPixelTestFn) image.Image {
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r := image.Rect(0, 0, size.X, size.Y)
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icon := image.NewAlpha(r)
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for y := 0; y < size.Y; y++ {
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for x := 0; x < size.X; x++ {
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pt := geom.PtF32(float32(x), float32(y))
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if a := test(pt); a > 0 {
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icon.Set(x, y, color.Alpha{A: a})
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}
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}
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}
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return icon
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}
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func GetOrCreateIcon(ctx Context, name string, test ImagePixelTestFn) Texture {
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texture := ctx.Textures().Texture(name)
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if texture != nil {
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return texture
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}
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texture, err := ctx.Textures().CreateTexture(name, test.CreateImageSource(IconSize()))
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if err != nil {
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return nil
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}
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return texture
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}
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func IconSize() geom.Point {
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return geom.Pt(448, 512)
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}
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type PixelImageSource struct {
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ImagePixelTestFn
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Size geom.Point
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}
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func (s *PixelImageSource) CreateImage() (image.Image, error) {
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return DrawImage(s.Size, s.ImagePixelTestFn), nil
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}
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