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    <title>LAB 2: Perception et couleurs</title>
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class: center, middle, title

# Lab 2: Perception et couleurs

### 2019-2020

## Dr. Antoine Neuraz

### AHU Informatique médicale
#### Hôpital Necker-Enfants malades, &lt;/br&gt; Université de Paris


---
class: inverse, center, middle
# Perception des différentes marques dans ggplot2

---
## TODO: échauffement

#### Générer un dataset aléatoire avec la fonction vizoR::generate_dataset_uniform

```r
size &lt;- list(100, 2)
min_x &lt;- 0
max_x &lt;- 1
seed &lt;- 34
```
---
## TODO: perception

#### 1. Réaliser des plots avec les échelles suivantes sur la variable group : 
- couleur
- forme
- angle
- taille
- luminosité
- courbe
- encapsulage
- remplissage

Certaines échelles sont très simples à mettre en place (e.g. couleur, forme) mais d'autres n'existent pas directement. Il faut trouver une alternative. 

#### 2. Comparer l'efficacité des différentes échelles pour distinguer les 2 groupes

---
## Couleur


--
.small[

```r
p_color &lt;- ggplot( data = dt, 
                   aes(x = x, y = y, color = group)) +
  geom_point(size = 3, alpha = .6) +
  see::scale_color_material_d() +
  vizoR::theme_void_complete() +
  labs(subtitle= "Couleur")

p_color
```

![](lab02-perception-colors_files/figure-html/unnamed-chunk-3-1.png)&lt;!-- --&gt;
]


---
## Angle 

--

.small[

```r
p_angle &lt;- dt %&gt;%
  mutate(angle = ifelse(group == "group1", 0, pi / 3)) %&gt;%
  ggplot(
    data = ., aes( x = x, y = y, angle = angle ) ) +
  geom_spoke(radius = 0.02,size = .8, alpha = .6 ) +
  theme_void_complete() +
  scale_color_material_d() +
  ggtitle("Angle")
p_angle
```

![](lab02-perception-colors_files/figure-html/unnamed-chunk-4-1.png)&lt;!-- --&gt;
]
---
## Taille

--

.small[

```r
p_size &lt;- dt %&gt;%
  mutate(size = ifelse(group == "group1", 2, 3)) %&gt;%
  ggplot( data = .,
          aes( x = x,y = y,size = size)) +
  geom_point(alpha = .6) +
  theme_void_complete() +
  scale_size(range = c(1, 3)) +
  ggtitle("Taille")
p_size
```

![](lab02-perception-colors_files/figure-html/unnamed-chunk-5-1.png)&lt;!-- --&gt;
]

---
## Luminosité

--

.small[

```r
p_grey &lt;- dt %&gt;%
  ggplot(
    data = .,aes(x = x,y = y,color = group)) +
  geom_point(size = 3, alpha = .6) +
  theme_void_complete() +
  #scale_color_grey() +
  scale_color_grey(start=.8, end=.2)+
  ggtitle("Luminosité")
p_grey
```

![](lab02-perception-colors_files/figure-html/unnamed-chunk-6-1.png)&lt;!-- --&gt;
]
---
## Courbe

--

.small[

```r
dt &lt;- dt %&gt;%
  mutate(curvature = ifelse(group == "group1", 0, 1))

p_curve &lt;- dt %&gt;%
  ggplot(data = .,aes(x = x,y = y,xend = x, yend = y+max_x/50, curvature = curvature)) +
  #geom_curve()+
  geom_curve(data = subset(dt, group == 'group1'), curvature = 0, alpha = .7) +
  geom_curve(data = subset(dt, group == 'group2'), curvature = .7, alpha = .7) +
  scale_color_material_d() +
  theme_void_complete() +
  ggtitle("Courbe")
p_curve
```

![](lab02-perception-colors_files/figure-html/unnamed-chunk-7-1.png)&lt;!-- --&gt;
]
---
## Encapsulage

--

.small[

```r
p_box &lt;- dt %&gt;%
  ggplot(data = .,aes(x = x,xend = x+max_x/50,y = y,yend = y, group = group)) +
  geom_point(data = subset(dt, group=='group2'),aes(x = x+max_x/100), shape = 22, size = 13) + 
  geom_segment() +
  scale_color_material_d() +
  theme_void_complete() +
  ggtitle("Encapsulage")
p_box
```

![](lab02-perception-colors_files/figure-html/unnamed-chunk-8-1.png)&lt;!-- --&gt;
]

---
## Forme

--

.small[

```r
p_shape &lt;- dt %&gt;%
  ggplot(data = .,aes(x = x,y = y,shape = group)) +
  geom_point(size = 3, alpha = .6) +
  theme_void_complete() +
  ggtitle("Forme")
p_shape
```

![](lab02-perception-colors_files/figure-html/unnamed-chunk-9-1.png)&lt;!-- --&gt;
]
---
## Remplissage

--

.small[

```r
p_fill &lt;- dt %&gt;%
  ggplot(data = ., aes( x = x,y = y,fill = group)) +
  geom_point(size = 3, shape = 21, alpha = .7) +
  scale_fill_manual(values = c('group2' = 'black', 'group1' = 'white')) +
  theme_void_complete() +
  ggtitle("Remplissage")
p_fill
```

![](lab02-perception-colors_files/figure-html/unnamed-chunk-10-1.png)&lt;!-- --&gt;
]

---
class: full, center, middle
&lt;img src="lab02-perception-colors_files/figure-html/unnamed-chunk-11-1.png" width="2000px" /&gt;


---
class: full
### Les couleurs dans ggplot2 `display.brewer.all()`

![:scale 80%](img/palettes.jpg)

---
## TODO: couleurs

#### Charger le dataset diamonds et créer un sous-dataset aléatoire de 1000 lignes

#### Plot carat en fonction du prix et de la couleur

#### changer la palette par défaut vers une autre palette disponible

---

```r
dsamp &lt;- diamonds[sample(nrow(diamonds), 1000), ]
ggplot(dsamp, aes(carat, price)) +
  geom_point(aes(colour = color)) +
  scale_color_brewer(palette = "Set3") + 
  facet_wrap(~color)
```

![](lab02-perception-colors_files/figure-html/unnamed-chunk-12-1.png)&lt;!-- --&gt;


---
## TODO: couleurs 2

#### Plot carat en fonction du prix avec carat en double encodage

#### Aller sur [http://colorbrewer2.org]() et trouver une palette divergente

#### Créer une palette custom basée sur cette palette et l'appliquer au plot précédent

#### Caler la palette sur le carat moyen 

#### Annoter le plot avec une ligne désignant le carat moyen et un texte expliquant cette ligne
---


```r
ggplot(dsamp, aes(carat, price)) +
  geom_point(aes(colour = carat)) +
  scale_color_distiller(palette="RdYlBu")
```

![](lab02-perception-colors_files/figure-html/unnamed-chunk-13-1.png)&lt;!-- --&gt;

---

```r
#showtext_auto()
#font_add_google("Schoolbell", "bell")

font_family = "sans"
annotate_color = "grey50"

midpoint = (max(dsamp$carat)-min(dsamp$carat))/2

ggplot(dsamp, aes(carat, price)) +
  geom_vline(xintercept = midpoint, color = annotate_color) +
  geom_point(aes(colour = carat)) +
  scale_color_gradient2(low = "#d8b365", 
                        mid="#f5f5f5", 
                        high="#5ab4ac", 
                        midpoint = midpoint) +
  annotate("text", 
           x=.78, y=15000, hjust=1, srt=40,
           label ="this is the midpoint",  
           family=font_family, 
           color=annotate_color) +
  annotate("curve", 
           x = .8, xend=midpoint-.01, y=15000, yend = 14000,
           curvature = -.5, 
           color=annotate_color ,
           arrow=arrow(length = unit(0.03, "npc") )) + 

  theme_elegant() +
  theme(panel.grid.minor = element_blank(), 
        panel.grid.major.x = element_blank(), 
        legend.position = "none") 
```

---
![](lab02-perception-colors_files/figure-html/unnamed-chunk-15-1.png)&lt;!-- --&gt;
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