Cesium color color (assignment) random color

Assignment method ：

1. English color words

//  Set the color ： Cesium.Color. Color 
Cesium.Color.WHITE;
//  Set color and transparency ： esium.Color. Color . transparency 
Cesium.Color.BLUE.withAlpha(0.4)
//  transparent color 
Cesium.Color.TRANSPARENT;

2. rgba（0-255 Section ） Be careful ： here alpha It's also 0-255 Section

// Cesium.Color.fromBytes(red ,green ,blue ,alpha ,result)
// result Is the color setting result , Objects that can be stored to can also be saved without .
Cesium.Color.fromBytes(177, 0, 4, 200);

3. rgba（0-1 Section ） Calculation method ：255 The value of the interval / 255

// Cesium.Color(red, green, blue, alpha)
Cesium.Color(177/255, 0/255, 4/255, 1)
Cesium.Color(0.165, 0.165, 0.165, 1)

4. CSS Color conversion

// Cesium.Color.fromCssColorString('CSS Color value ')
Cesium.Color.fromCssColorString("#ffffff")
Cesium.Color.fromCssColorString("rgba(255, 255, 255, 0.75)")

6. 32 position GRBA value

// Cesium.Color.fromRgba(rgba, result)
Cesium.Color.fromRgba(0x67ADDFFF)

7. Random color

// Cesium.Color.fromRandom({alpha:  transparency })
Cesium.Color.fromRandom({
    alpha: 0.5})

Tips ：

Only change the transparency without changing the original color , have access to getValue Method

//  Set font fill transparency 
label.fillColor = label.fillColor.getValue().withAlpha(0.8);
//  Set the transparency of the font border 
label.outlineColor= label.outlineColor.getValue().withAlpha(0.8);
//  Set the transparency of the underground color of the ball  （ Here we use  undergroundColor  And back again  Cesium.Color  object ）
globe.viewer.scene.globe.undergroundColor.withAlpha(0.8)