refacto ts + ajout de dessin simple + ajout pinceau

WIP lib graphique

rootfs overrides/usr/lib/shapes.js

@@ -0,0 +1,101 @@
+//@ts-check
+/**
+ * DICKPICK is a image drawing library
+ */
+
+const graphics = require('../../chibrax/graphics')
+
+/**
+ * @param { number } x
+ * @param { number } y
+ * @param { number } dx length on the x axis
+ * @param { number } dy length on the y axis
+ * @param { string } color
+ */
+function drawRect(x, y, dx, dy, color) {
+    const bitmap = {
+        data: Buffer.alloc(dx*dy*4, Buffer.from(graphics.parseHexColor(color))),
+        width: dx,
+        height: dy
+    }
+
+    graphics.drawBitmap(x,y, bitmap)
+}
+
+/**
+ *
+ * @param { import('@jimp/core').Bitmap } Bitmap
+ * @param { number[] } color
+ * @returns { Pencil }
+ */
+function pencilFromBitmap(Bitmap, color) {
+    return { ...Bitmap, color }
+}
+
+/**
+ * @param { number } width
+ * @param { number } height
+ * @returns
+ */
+function createBitmap(width, height) {
+    const data = Buffer.alloc(width * height * 4, Buffer.from([0, 0, 0, 0]));
+    return { width, height, data }
+}
+
+/**
+ * @param { Pencil } pencil
+ * @param { number } x
+ * @param { number } y
+ */
+function setPixel(pencil, x, y) {
+    pencil.data.set(pencil.color, y*pencil.width*4 + x*4)
+}
+
+
+/**
+ *
+ * @param { number } x
+ * @param { number } y
+ * @param { number } xc
+ * @param { number } yc
+ * @param { Pencil } pencil
+ */
+function symetrie8Axes(xc, yc, x, y, pencil) {
+    setPixel(pencil, x+xc, y+yc)
+    setPixel(pencil, x+xc,-y+yc)
+    setPixel(pencil, -x+xc,-y+yc)
+    setPixel(pencil, -x+xc,y+yc)
+    setPixel(pencil, y+xc,x+yc)
+    setPixel(pencil, y+xc,-x+yc)
+    setPixel(pencil, -y+xc,-x+yc)
+    setPixel(pencil, -y+xc,x+yc,)
+}
+
+/**
+ * BresenhamCircle
+ * @param { Pencil } pencil
+ * @param { number } xc
+ * @param { number } yc
+ * @param { number } r
+ */
+function drawCircle(pencil, xc, yc, r) {
+    let x = 0
+    let y = r
+    let d = 3 - (2 * r);
+    symetrie8Axes(xc, yc, x, y, pencil);
+
+    while(x <= y) {
+        if(d <= 0) {
+            d = d + (4 * x) + 6;
+        }
+        else {
+            d = d + (4 * x) - (4 * y) + 10;
+            y = y - 1;
+        }
+        x = x + 1;
+        symetrie8Axes(xc, yc, x, y, pencil);
+    }
+}
+
+
+module.exports = { drawRect, setPixel, pencilFromBitmap, createBitmap, drawCircle }