13725782068

Committed 07 Mar 2025 05:16PM CUT coverage: 28.089% (-19.3%) from 47.374%

Build # 13725782068

Build Type

Pull #8

github

Committed by

web-flow

Commit Message

Merge c22a6e346 into 2253cb584

Pull Request Pull Request #8: Add first plot drawers

Run Details

7 of 677 new or added lines in 11 files covered. (1.03%)

457 of 1627 relevant lines covered (28.09%)

55.34 hits per line

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0.0

/plot/image.go

package plot

import (
        "image/color"

        pixel "github.com/gopxl/pixel/v2"
        "github.com/gopxl/pixel/v2/backends/opengl"
        "github.com/mazznoer/colorgrad"
        "github.com/mlange-42/ark-pixel/window"
        "github.com/mlange-42/ark-tools/observer"
        "github.com/mlange-42/ark/ecs"
)

// Image drawer.
//
// Draws an image from a Matrix observer.
// The image is scaled to the canvas extent, with preserved aspect ratio.
// Does not add plot axes etc.
type Image struct {
        Scale    float64            // Spatial scaling: cell size in screen pixels. Optional, default auto.
        Observer observer.Matrix    // Observer providing 2D matrix or grid data.
        Colors   colorgrad.Gradient // Colors for mapping values.
        Min      float64            // Minimum value for color mapping. Optional.
        Max      float64            // Maximum value for color mapping. Optional. Is set to 1.0 if both Min and Max are zero.
        slope    float64
        picture  *pixel.PictureData
}

// Initialize the system
func (i *Image) Initialize(w *ecs.World, win *opengl.Window) {
        i.Observer.Initialize(w)

        if i.Min == 0 && i.Max == 0 {
                i.Max = 1
        }

        i.slope = 1.0 / (i.Max - i.Min)

        width, height := i.Observer.Dims()
        i.picture = pixel.MakePictureData(pixel.R(0, 0, float64(width), float64(height)))
}

// Update the drawer.
func (i *Image) Update(w *ecs.World) {
        i.Observer.Update(w)
}

// UpdateInputs handles input events of the previous frame update.
func (i *Image) UpdateInputs(w *ecs.World, win *opengl.Window) {}

// Draw the system
func (i *Image) Draw(w *ecs.World, win *opengl.Window) {
        values := i.Observer.Values(w)

        length := len(values)
        for j := 0; j < length; j++ {
                i.picture.Pix[j] = i.valueToColor(values[j])
        }

        scale := i.Scale
        if i.Scale <= 0 {
                scale = window.Scale(win, i.picture.Rect.W(), i.picture.Rect.H())
        }

        sprite := pixel.NewSprite(i.picture, i.picture.Bounds())
        sprite.Draw(win,
                pixel.IM.Moved(pixel.V(i.picture.Rect.W()/2.0, i.picture.Rect.H()/2.0)).
                        Scaled(pixel.Vec{}, scale),
        )
}

func (i *Image) valueToColor(v float64) color.RGBA {
        c := i.Colors.At((v - i.Min) * i.slope)
        return color.RGBA{
                R: uint8(c.R * 255),
                G: uint8(c.G * 255),
                B: uint8(c.B * 255),
                A: 0xff,
        }
}

1	package plot
2
3	import (
4	"image/color"
5
6	pixel "github.com/gopxl/pixel/v2"
7	"github.com/gopxl/pixel/v2/backends/opengl"
8	"github.com/mazznoer/colorgrad"
9	"github.com/mlange-42/ark-pixel/window"
10	"github.com/mlange-42/ark-tools/observer"
11	"github.com/mlange-42/ark/ecs"
12	)
13
14	// Image drawer.
15	//
16	// Draws an image from a Matrix observer.
17	// The image is scaled to the canvas extent, with preserved aspect ratio.
18	// Does not add plot axes etc.
19	type Image struct {
20	Scale float64 // Spatial scaling: cell size in screen pixels. Optional, default auto.
21	Observer observer.Matrix // Observer providing 2D matrix or grid data.
22	Colors colorgrad.Gradient // Colors for mapping values.
23	Min float64 // Minimum value for color mapping. Optional.
24	Max float64 // Maximum value for color mapping. Optional. Is set to 1.0 if both Min and Max are zero.
25	slope float64
26	picture *pixel.PictureData
27	}
28
29	// Initialize the system
NEW 30	func (i Image) Initialize(w ecs.World, win *opengl.Window) {	×
NEW 31	i.Observer.Initialize(w)	×
NEW 32		×
NEW 33	if i.Min == 0 && i.Max == 0 {	×
NEW 34	i.Max = 1	×
NEW 35	}	×
36
NEW 37	i.slope = 1.0 / (i.Max - i.Min)	×
NEW 38		×
NEW 39	width, height := i.Observer.Dims()	×
NEW 40	i.picture = pixel.MakePictureData(pixel.R(0, 0, float64(width), float64(height)))	×
41	}
42
43	// Update the drawer.
NEW 44	func (i Image) Update(w ecs.World) {	×
NEW 45	i.Observer.Update(w)	×
NEW 46	}	×
47
48	// UpdateInputs handles input events of the previous frame update.
NEW 49	func (i Image) UpdateInputs(w ecs.World, win *opengl.Window) {}	×
50
51	// Draw the system
NEW 52	func (i Image) Draw(w ecs.World, win *opengl.Window) {	×
NEW 53	values := i.Observer.Values(w)	×
NEW 54		×
NEW 55	length := len(values)	×
NEW 56	for j := 0; j < length; j++ {	×
NEW 57	i.picture.Pix[j] = i.valueToColor(values[j])	×
NEW 58	}	×
59
NEW 60	scale := i.Scale	×
NEW 61	if i.Scale <= 0 {	×
NEW 62	scale = window.Scale(win, i.picture.Rect.W(), i.picture.Rect.H())	×
NEW 63	}	×
64
NEW 65	sprite := pixel.NewSprite(i.picture, i.picture.Bounds())	×
NEW 66	sprite.Draw(win,	×
NEW 67	pixel.IM.Moved(pixel.V(i.picture.Rect.W()/2.0, i.picture.Rect.H()/2.0)).	×
NEW 68	Scaled(pixel.Vec{}, scale),	×
NEW 69	)	×
70	}
71
NEW 72	func (i *Image) valueToColor(v float64) color.RGBA {	×
NEW 73	c := i.Colors.At((v - i.Min) * i.slope)	×
NEW 74	return color.RGBA{	×
NEW 75	R: uint8(c.R * 255),	×
NEW 76	G: uint8(c.G * 255),	×
NEW 77	B: uint8(c.B * 255),	×
NEW 78	A: 0xff,	×
NEW 79	}	×
NEW 80	}	×

mlange-42 / ark-pixel / 13725782068

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