## Asymptote and opacity – fig0010

Category: Asymptote,Examples 2D,OpacityPh. Ivaldi @ 16 h 54 min

 (Compiled with Asymptote version 1.87svn-r4652)
```
import edvenn_pi;

string blend="Compatible"; //This is the default value

size(10cm,0);

path [] edvenn= EdVenn(4);
pen [] fillp= new pen[]{black, red, green, blue};
pen p=linewidth(1mm);

for (int i=0; i<4; ++i) {
fillp[i]=fillp[i]+opacity(.5,blend=blend);
filldraw(edvenn[i], fillpen=fillp[i], drawpen=linewidth((i+1)*mm/2));
}

shipout(bbox(2mm,invisible),"pdf");

```

Étiquettes :

## Asymptote and opacity – fig0020

Category: Asymptote,Examples 2D,OpacityPh. Ivaldi @ 17 h 54 min

 (Compiled with Asymptote version 1.87svn-r4652)
```
import edvenn_pi;

// Normal: Selects the source color, ignoring the backdrop.
string blend="Normal";

size(10cm,0);

path [] edvenn= EdVenn(4);
pen [] fillp= new pen[]{black, red, green, blue};
pen p=linewidth(1mm);

for (int i=0; i<4; ++i) {
fillp[i]=fillp[i]+opacity(.5,blend=blend);
filldraw(edvenn[i], fillpen=fillp[i], drawpen=linewidth((i+1)*mm/2));
}

shipout(bbox(2mm,invisible),"pdf");

```

Étiquettes :

## Asymptote and opacity – fig0030

Category: Asymptote,Examples 2D,OpacityPh. Ivaldi @ 18 h 54 min

 (Compiled with Asymptote version 1.87svn-r4652)
```
import edvenn_pi;

// Multiply: Multiplies the backdrop and source color values:
// The result color is always at least as dark as either of the two constituent
// colors. Multiplying any color with black produces black;
// multiplying with white leaves the original color unchanged. Painting
// successive overlapping objects with a color other than black or
// white produces progressively darker colors.
string blend="Multiply";

size(10cm,0);

path [] edvenn= EdVenn(4);
pen [] fillp= new pen[]{black, red, green, blue};
pen p=linewidth(1mm);

for (int i=0; i<4; ++i) {
fillp[i]=fillp[i]+opacity(.5,blend=blend);
filldraw(edvenn[i], fillpen=fillp[i], drawpen=linewidth((i+1)*mm/2));
}

shipout(bbox(2mm,invisible),"pdf");

```

Étiquettes :

## Asymptote and opacity – fig0040

Category: Asymptote,Examples 2D,OpacityPh. Ivaldi @ 19 h 54 min

 (Compiled with Asymptote version 1.87svn-r4652)
```
// The result does not support image conversion.
// You can view it in the file fig0040.pdf.

import edvenn_pi;

// Screen: Multiplies the complements of the backdrop and source color
// values, then complements the result:
// The result color is always at least as light as either of the two constituent
// colors. Screening any color with white produces white; screening
// with black leaves the original color unchanged. The effect is
// similar to projecting multiple photographic slides simultaneously
// onto a single screen.
string blend="Screen";

size(10cm,0);

path [] edvenn= EdVenn(4);
pen [] fillp= new pen[]{black, red, green, blue};
pen p=linewidth(1mm);

for (int i=0; i<4; ++i) {
fillp[i]=fillp[i]+opacity(.5,blend=blend);
filldraw(edvenn[i], fillpen=fillp[i], drawpen=linewidth((i+1)*mm/2));
}

shipout(bbox(2mm,invisible),"pdf");

```

Étiquettes :

## Asymptote and opacity – fig0050

Category: Asymptote,Examples 2D,OpacityPh. Ivaldi @ 20 h 54 min

 (Compiled with Asymptote version 1.87svn-r4652)
```
import edvenn_pi;

// Overlay: Multiplies or screens the colors, depending on the backdrop color.
// Source colors overlay the backdrop while preserving its highlights
// and shadows. The backdrop color is not replaced but is mixed with
// the source color to reflect the lightness or darkness of the backdrop.
string blend="Overlay";

size(10cm,0);

path [] edvenn= EdVenn(4);
pen [] fillp= new pen[]{black, red, green, blue};
pen p=linewidth(1mm);

for (int i=0; i<4; ++i) {
fillp[i]=fillp[i]+opacity(.5,blend=blend);
filldraw(edvenn[i], fillpen=fillp[i], drawpen=linewidth((i+1)*mm/2));
}

shipout(bbox(2mm,invisible),"pdf");

```

Étiquettes :

## Asymptote and opacity – fig0060

Category: Asymptote,Examples 2D,OpacityPh. Ivaldi @ 21 h 54 min

 (Compiled with Asymptote version 1.87svn-r4652)
```
import edvenn_pi;

// Darken: Selects the darker of the backdrop and source colors:
// The backdrop is replaced with the source where the source is darker;
// otherwise, it is left unchanged.
string blend="Darken";

size(10cm,0);

path [] edvenn= EdVenn(4);
pen [] fillp= new pen[]{black, red, green, blue};
pen p=linewidth(1mm);

for (int i=0; i<4; ++i) {
fillp[i]=fillp[i]+opacity(.5,blend=blend);
filldraw(edvenn[i], fillpen=fillp[i], drawpen=linewidth((i+1)*mm/2));
}

shipout(bbox(2mm,invisible),"pdf");

```

Étiquettes :

## Asymptote and opacity – fig0070

Category: Asymptote,Examples 2D,OpacityPh. Ivaldi @ 22 h 54 min

 (Compiled with Asymptote version 1.87svn-r4652)
```
import edvenn_pi;

// Lighten: Selects the lighter of the backdrop and source colors:
// The backdrop is replaced with the source where the source is lighter;
// otherwise, it is left unchanged.
string blend="Lighten";

size(10cm,0);

path [] edvenn= EdVenn(4);
pen [] fillp= new pen[]{black, red, green, blue};
pen p=linewidth(1mm);

for (int i=0; i<4; ++i) {
fillp[i]=fillp[i]+opacity(.5,blend=blend);
filldraw(edvenn[i], fillpen=fillp[i], drawpen=linewidth((i+1)*mm/2));
}

shipout(bbox(2mm,invisible),"pdf");

```

Étiquettes :

## Asymptote and opacity – fig0080

Category: Asymptote,Examples 2D,OpacityPh. Ivaldi @ 23 h 54 min

 (Compiled with Asymptote version 1.87svn-r4652)
```
import edvenn_pi;

// ColorDodge: Brightens the backdrop color to reflect the source color. Painting
// with black produces no change.
string blend="ColorDodge";

size(10cm,0);

path [] edvenn= EdVenn(4);
pen [] fillp= new pen[]{black, red, green, blue};
pen p=linewidth(1mm);

for (int i=0; i<4; ++i) {
fillp[i]=fillp[i]+opacity(.5,blend=blend);
filldraw(edvenn[i], fillpen=fillp[i], drawpen=linewidth((i+1)*mm/2));
}

shipout(bbox(2mm,invisible),"pdf");

```

Étiquettes :

## Asymptote and opacity – fig0090

Category: Asymptote,Examples 2D,OpacityPh. Ivaldi @ 0 h 54 min

 (Compiled with Asymptote version 1.87svn-r4652)
```
import edvenn_pi;

// ColorBurn Darkens the backdrop color to reflect the source color. Painting
// with white produces no change.
string blend="ColorBurn";

size(10cm,0);

path [] edvenn= EdVenn(4);
pen [] fillp= new pen[]{black, red, green, blue};
pen p=linewidth(1mm);

for (int i=0; i<4; ++i) {
fillp[i]=fillp[i]+opacity(.5,blend=blend);
filldraw(edvenn[i], fillpen=fillp[i], drawpen=linewidth((i+1)*mm/2));
}

shipout(bbox(2mm,invisible),"pdf");

```

Étiquettes :

## Asymptote and opacity – fig0100

Category: Asymptote,Examples 2D,OpacityPh. Ivaldi @ 1 h 54 min

 (Compiled with Asymptote version 1.87svn-r4652)
```
import edvenn_pi;

// HardLight: Multiplies or screens the colors, depending on the source color
// value. If the source color is lighter than 0.5, the backdrop is lightened
// as if it were screened; this is useful for adding highlights to a
// scene. If the source color is darker than 0.5, the backdrop is darkened
// as if it were multiplied; this is useful for adding shadows to a
// scene. The degree of lightening or darkening is proportional to the
// difference between the source color and 0.5; if it is equal to 0.5, the
// backdrop is unchanged. Painting with pure black or white produces
// pure black or white. The effect is similar to shining a harsh spotlight
// on the backdrop.
string blend="HardLight";

size(10cm,0);

path [] edvenn= EdVenn(4);
pen [] fillp= new pen[]{black, red, green, blue};
pen p=linewidth(1mm);

for (int i=0; i<4; ++i) {
fillp[i]=fillp[i]+opacity(.5,blend=blend);
filldraw(edvenn[i], fillpen=fillp[i], drawpen=linewidth((i+1)*mm/2));
}

shipout(bbox(2mm,invisible),"pdf");

```

Étiquettes :

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