commit

src/tool/color.js

@@ -0,0 +1,37 @@
+let setColor = (rgba,url) =>{
+   return new Promise(resolve =>{
+	var img = new Image();
+	img.src = url;
+	img.onload = () => {
+		const width = img.width;
+		const height = img.height;
+		const canvas = docuemnt.createElement("canvas");
+		canvas.width = width
+		canvas.height = height
+		var ctx = canvas.getContext("2d");
+		ctx.drawImage(img,0,0)
+		var data = ctx.getImageData(0,0,width,height)
+		var num = 0;
+		for (let i = 0; i < data.data.length; i+=4) {
+			var r = data.data[i];
+			var g = data.data[i+1];
+			var b = data.data[i+2];
+			var a = data.data[i+3];
+			if(r + min < rgba[0] 
+				&& r + max > rgba[0]
+				&& g + min < rgba[1] 
+				&& g + max > rgba[1]
+				&& b + min < rgba[2]
+				&& b + max > rgba[2]
+				&& a == rgba[3]){
+					num++
+				}
+		}
+		resolve({
+			width,height,num
+		})
+	}
+   })
+};
+
+export default setColor