From 117bc020e7fa73c3e73229cdd3bf162d572a923b Mon Sep 17 00:00:00 2001
From: Miika Alonen <amiika@gmail.com>
Date: Sat, 16 Dec 2023 23:14:58 +0200
Subject: [PATCH] Added gradients and smiley function

---
 src/API.ts | 141 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)

diff --git a/src/API.ts b/src/API.ts
index 0a4df1f..f5bba41 100644
--- a/src/API.ts
+++ b/src/API.ts
@@ -2219,6 +2219,80 @@ export class UserAPI {
     return canvas.height;
   }
 
+  public background = (color: string|number, ...gb:number[]): void => {
+    /**
+     * Set background color of the canvas.
+     * @param color - The color to set. String or 3 numbers representing RGB values.
+     */
+    const canvas: HTMLCanvasElement = this.app.interface.drawings as HTMLCanvasElement;
+    const ctx = canvas.getContext("2d")!;
+    if(typeof color === "number") color = `rgb(${color},${gb[0]},${gb[1]})`;
+    ctx.fillStyle = color;
+    ctx.fillRect(0, 0, canvas.width, canvas.height);
+  }
+
+  public linearGradient = (x1: number, y1: number, x2: number, y2: number, ...stops: (number|string)[]) => {
+    /**
+     * Set linear gradient on the canvas.
+     * @param x1 - The x-coordinate of the start point
+     * @param y1 - The y-coordinate of the start point
+     * @param x2 - The x-coordinate of the end point
+     * @param y2 - The y-coordinate of the end point
+     * @param stops - The stops to set. Pairs of numbers representing the position and color of the stop.
+     */
+    const canvas: HTMLCanvasElement = this.app.interface.drawings as HTMLCanvasElement;
+    const ctx = canvas.getContext("2d")!;
+    const gradient = ctx.createLinearGradient(x1, y1, x2, y2);
+    // Parse pairs of values from stops
+    for(let i=0; i<stops.length; i+=2) {
+      let color = stops[i+1];
+      if(typeof color === "number") color = `rgb(${color},${stops[i+2]},${stops[i+3]})`;
+      gradient.addColorStop((stops[i] as number), color);
+    }
+    return gradient;
+  }
+
+  public radialGradient = (x1: number, y1: number, r1: number, x2: number, y2: number, r2: number, ...stops: (number|string)[]) => {
+    /**
+     * Set radial gradient on the canvas.
+     * @param x1 - The x-coordinate of the start circle
+     * @param y1 - The y-coordinate of the start circle
+     * @param r1 - The radius of the start circle
+     * @param x2 - The x-coordinate of the end circle
+     * @param y2 - The y-coordinate of the end circle
+     * @param r2 - The radius of the end circle
+     * @param stops - The stops to set. Pairs of numbers representing the position and color of the stop.
+     */
+    const canvas: HTMLCanvasElement = this.app.interface.drawings as HTMLCanvasElement;
+    const ctx = canvas.getContext("2d")!;
+    const gradient = ctx.createRadialGradient(x1, y1, r1, x2, y2, r2);
+    for(let i=0; i<stops.length; i+=2) {
+      let color = stops[i+1];
+      if(typeof color === "number") color = `rgb(${color},${stops[i+2]},${stops[i+3]})`;
+      gradient.addColorStop((stops[i] as number), color);
+    }
+    return gradient;
+  }
+
+  public conicGradient = (x: number, y: number, angle: number, ...stops: (number|string)[]) => {
+    /**
+     * Set conic gradient on the canvas.
+     * @param x - The x-coordinate of the center of the gradient
+     * @param y - The y-coordinate of the center of the gradient
+     * @param angle - The angle of the gradient, in radians
+     * @param stops - The stops to set. Pairs of numbers representing the position and color of the stop.
+     */
+    const canvas: HTMLCanvasElement = this.app.interface.drawings as HTMLCanvasElement;
+    const ctx = canvas.getContext("2d")!;
+    const gradient = ctx.createConicGradient(x, y, angle);
+    for(let i=0; i<stops.length; i+=2) {
+      let color = stops[i+1];
+      if(typeof color === "number") color = `rgb(${color},${stops[i+2]},${stops[i+3]})`;
+      gradient.addColorStop((stops[i] as number), color);
+    }
+    return gradient;
+  }
+
   public draw = (func: Function): void => {
     /**
      * Draws on the canvas.
@@ -2331,6 +2405,73 @@ export class UserAPI {
     ctx.restore();
   }
 
+  public smiley = (
+    x: number,
+    y: number,
+    radius: number,
+    fillStyle: string,
+    eyeSize: number = 1.0,
+    happiness: number = 0.0,
+    rotation: number = 0
+  ): void => {
+    const canvas: HTMLCanvasElement = this.app.interface.drawings as HTMLCanvasElement;
+    const ctx = canvas.getContext("2d")!;
+    // Map the rotation value to an angle within the range of -PI to PI
+    const rotationAngle = rotation/100 * Math.PI;
+    ctx.save();
+    ctx.translate(x, y);
+    ctx.rotate(rotationAngle);
+
+    // Draw face
+    ctx.beginPath();
+    ctx.arc(0, 0, radius, 0, 2 * Math.PI);
+    ctx.fillStyle = fillStyle;
+    ctx.fill();
+    ctx.lineWidth = radius / 20;
+    ctx.strokeStyle = "black";
+    ctx.stroke();
+
+    // Draw eyes
+    const eyeY = -radius / 5;
+    const eyeXOffset = radius / 2.5;
+    const eyeRadiusX = radius / 8;
+    const eyeRadiusY = eyeSize * radius / 10;
+
+    ctx.beginPath();
+    ctx.ellipse(-eyeXOffset, eyeY, eyeRadiusX, eyeRadiusY, 0, 0, 2 * Math.PI);
+    ctx.fillStyle = "black";
+    ctx.fill();
+
+    ctx.beginPath();
+    ctx.ellipse(eyeXOffset, eyeY, eyeRadiusX, eyeRadiusY, 0, 0, 2 * Math.PI);
+    ctx.fillStyle = "black";
+    ctx.fill();
+
+    // Draw mouth with happiness number -1.0 to 1.0. 0.0 Should be a straight line.
+    const mouthY = radius / 2;
+    const mouthLength = radius * 0.9;
+    const smileFactor = 0.25; // Adjust for the smile curvature
+  
+    let controlPointX = 0;
+    let controlPointY = 0;
+  
+    if (happiness >= 0) {
+      controlPointY = mouthY + happiness * smileFactor * radius / 2;
+    } else {
+      controlPointY = mouthY + happiness * smileFactor * radius / 2;
+    }
+  
+    ctx.beginPath();
+    ctx.moveTo(-mouthLength / 2, mouthY);
+    ctx.quadraticCurveTo(controlPointX, controlPointY, mouthLength / 2, mouthY);
+    ctx.lineWidth = 10;
+    ctx.strokeStyle = "black";
+    ctx.stroke();
+    ctx.restore();
+
+  }
+
+
   // =============================================================
   // OSC Functions
   // =============================================================