import edvenn_pi;

// Luminosity: Creates a color with the luminance of the source color and the hue
// and saturation of the backdrop color. This produces an inverse
// effect to that of the Color mode.
string blend="Luminosity";

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");

    
import edvenn_pi;

// Color: Creates a color with the hue and saturation of the source color and
// the luminance of the backdrop color. This preserves the gray levels
// of the backdrop and is useful for coloring monochrome images or
// tinting color images.
string blend="Color";

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");

    
import edvenn_pi;

// Saturation: Creates a color with the saturation of the source color and the hue
// and luminance of the backdrop color. Painting with this mode in an
// area of the backdrop that is a pure gray (no saturation) produces no
// change.
string blend="Saturation";

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");

    
import edvenn_pi;

// Hue: Creates a color with the hue of the source color and the saturation
// and luminance of the backdrop color.
string blend="Hue";

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");

    
import edvenn_pi;

// Exclusion: Produces an effect similar to that of the Difference mode but lower
// in contrast. Painting with white inverts the backdrop color; painting
// with black produces no change.
string blend="Exclusion";

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");

    
import edvenn_pi;

// Difference: Subtracts the darker of the two constituent colors from the lighter
// color:
// Painting with white inverts the backdrop color; painting with black
// produces no change.
string blend="Difference";

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");

    
import edvenn_pi;

// SoftLight: Darkens or lightens 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 dodged; 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 burned in. 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 a distinctly darker or lighter area but does not result
// in pure black or white. The effect is similar to shining a diffused
// spotlight on the backdrop.
string blend="SoftLight";

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");

    
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");