simple stripe paint

to do: configurable tightness, phase, and angle (would require difficult code rework and weird math shit i don't know); hsl support
to recolor after-the-fact, you have to set oldColor instead of the paint tool (doable through mouse with prop.js, but you have to triple-check because it will not handle rgb() errors)

mods/stripe_paint.js

@@ -0,0 +1,120 @@
+function averageColors(color1,color2,outputType="rgb",weight1=0.5) {
+	color1 = convertColorFormats(color1,"json");
+	color2 = convertColorFormats(color2,"json");
+	theColor = averageColorObjects(color1,color2,weight1);
+	return convertColorFormats(theColor,outputType);
+};
+
+function stripeFunction(pixel,sineParamFunction) {
+	if(pixel.oldColor == undefined || pixel.oldColor == null) {
+		pixel.oldColor = pixel.color;
+	};
+
+	//oldColor self staining
+	for (var i = 0; i < adjacentCoords.length; i++) {
+		var x = pixel.x+adjacentCoords[i][0];
+		var y = pixel.y+adjacentCoords[i][1];
+		if(isEmpty(x,y,true)) {
+			continue;
+		};
+		var otherPixel = pixelMap[x][y];
+		if(otherPixel.element == pixel.element && pixel.oldColor && otherPixel.oldColor) {
+			otherPixel.oldColor = averageColors(pixel.oldColor,otherPixel.oldColor);
+		};
+	};
+	
+	var sineWeight = (1+Math.sin(sineParamFunction(pixel)))/2;
+	var preColor = averageColors(pixel.oldColor,"rgb(0,0,0)","json",sineWeight);
+	for(colorlet in preColor) {
+		preColor[colorlet] = Math.round(preColor[colorlet]);
+	};
+	pixel.color = convertColorFormats(preColor,"rgb");
+};
+
+function horizontalSpf(pixel) {
+	return pixel.y;
+};
+
+function verticalSpf(pixel) {
+	return pixel.x;
+};
+
+function diagonalSpf(pixel) {
+	return pixel.x+pixel.y;
+};
+
+function diagonalAltSpf(pixel) {
+	return pixel.x-pixel.y;
+};
+
+elements.horizontal_stripe_paint = {
+    behavior: behaviors.LIQUID,
+	state: "liquid",
+	density: 998,
+	tempHigh: 100,
+	stateHigh: "smoke",
+    color: elements.paint.color,
+	customColor: true,
+	category: "stripe paint",
+	properties: {
+		oldColor: null
+	},
+	stain: elements.dye.stain,
+    tick: function(pixel) {
+		stripeFunction(pixel,horizontalSpf);
+    },
+};
+
+elements.vertical_stripe_paint = {
+    behavior: behaviors.LIQUID,
+	state: "liquid",
+	density: 998,
+	tempHigh: 100,
+	stateHigh: "smoke",
+    color: elements.paint.color,
+	customColor: true,
+	category: "stripe paint",
+	properties: {
+		oldColor: null
+	},
+	stain: elements.dye.stain,
+    tick: function(pixel) {
+		stripeFunction(pixel,verticalSpf);
+    },
+};
+
+elements.diagonal_stripe_paint = {
+    behavior: behaviors.LIQUID,
+	state: "liquid",
+	density: 998,
+	tempHigh: 100,
+	stateHigh: "smoke",
+    color: elements.paint.color,
+	customColor: true,
+	category: "stripe paint",
+	properties: {
+		oldColor: null
+	},
+	stain: elements.dye.stain,
+    tick: function(pixel) {
+		stripeFunction(pixel,diagonalSpf);
+    },
+};
+
+elements.diagonal_2_stripe_paint = {
+    behavior: behaviors.LIQUID,
+	state: "liquid",
+	density: 998,
+	tempHigh: 100,
+	stateHigh: "smoke",
+    color: elements.paint.color,
+	customColor: true,
+	category: "stripe paint",
+	properties: {
+		oldColor: null
+	},
+	stain: elements.dye.stain,
+    tick: function(pixel) {
+		stripeFunction(pixel,diagonalAltSpf);
+    },
+};