Merge pull request #4 from Lemons-forks/main

waveforms ext

extensions.json

@@ -100,5 +100,15 @@
     "creator": [
       {"name": "BludIsAnLemon", "url": "https://scratch.mit.edu/users/BludIsAnLemon/"}
     ]
+  },
+  {
+    "title": "Waveforms",
+    "img": "images/Lemon/Waveforms.png",
+    "description": "Use real time waveform calculations in your project.",
+    "url": "extensions/Lemon/Waveforms.js",
+    "sandboxed": false,
+    "creator": [
+      {"name": "BludIsAnLemon", "url": "https://scratch.mit.edu/users/BludIsAnLemon/"}
+    ]
   }
 ]

extensions/Lemon/Waveforms.js

@@ -0,0 +1,186 @@
+(function(Scratch) {
+  'use strict';
+
+  if(!Scratch.extensions.unsandboxed) throw new Error('Please load the waveforms extension unsandboxed!')
+
+  class WaveformsEXT {
+    getInfo() {
+      return {
+        id: 'lemonWaveforms',
+        name: 'Waveforms',
+        blocks: [
+          {
+            opcode: 'sine',
+            blockType: Scratch.BlockType.REPORTER,
+            text: 'sine wave | [F0]hz',
+            arguments: {
+              F0: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 1
+              }
+            }
+          },
+          {
+            opcode: 'semisine',
+            blockType: Scratch.BlockType.REPORTER,
+            text: 'semisine wave | [F0]hz',
+            arguments: {
+              F0: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 1
+              }
+            }
+          },
+
+          '---',
+
+          {
+            opcode: 'square',
+            blockType: Scratch.BlockType.REPORTER,
+            text: 'square wave | [F0]hz | harmonics: [HARMONICS]',
+            arguments: {
+              F0: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 1
+              },
+              HARMONICS: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 50
+              }
+            }
+          },
+          {
+            opcode: 'triangle',
+            blockType: Scratch.BlockType.REPORTER,
+            text: 'triangle wave | [F0]hz | harmonics: [HARMONICS]',
+            arguments: {
+              F0: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 1
+              },
+              HARMONICS: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 10
+              }
+            }
+          },
+          {
+            opcode: 'sawtooth',
+            blockType: Scratch.BlockType.REPORTER,
+            text: 'sawtooth wave | [F0]hz | harmonics: [HARMONICS]',
+            arguments: {
+              F0: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 1
+              },
+              HARMONICS: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 10
+              }
+            }
+          },
+          {
+            opcode: 'pulse',
+            blockType: Scratch.BlockType.REPORTER,
+            text: 'pulse wave | [F0]hz | harmonics: [HARMONICS] | duty cycle: [DUTY_CYCLE]%',
+            arguments: {
+              F0: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 1
+              },
+              HARMONICS: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 10
+              },
+              DUTY_CYCLE: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 25
+              }
+            }
+          },
+
+          '---',
+
+          {
+            opcode: 'semicircle',
+            blockType: Scratch.BlockType.REPORTER,
+            text: 'semicircle wave | [F0]hz | radius: [RADIUS]',
+            arguments: {
+              F0: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 1
+              },
+              RADIUS: {
+                type: Scratch.ArgumentType.NUMBER,
+                defaultValue: 1
+              }
+            }
+          }
+        ]
+      };
+    }
+
+    timer() {
+      return Scratch.vm.runtime.ioDevices.clock.projectTimer();
+    }
+
+    sine({F0}) {
+      return Math.sin(2 * Math.PI * Scratch.Cast.toNumber(F0) * this.timer());
+    }
+
+    semisine({F0}) {
+      return Math.abs(Math.sin(2 * Math.PI * Scratch.Cast.toNumber(F0) * this.timer()))
+    }
+
+    square({F0, HARMONICS}) {
+      let value = 0;
+
+      for(let k = 1; k <= Scratch.Cast.toNumber(HARMONICS) * 2; k += 2) {
+        value += Math.sin(2 * Math.PI * k * Scratch.Cast.toNumber(F0) * this.timer()) / k;
+      }
+
+      return (4 / Math.PI) * value;
+    }
+
+    triangle({F0, HARMONICS}) {
+      let value = 0;
+
+      for(let k = 1; k <= Scratch.Cast.toNumber(HARMONICS) * 2; k += 2) {
+        value += Math.pow(-1, (k - 1) / 2) * Math.sin(2 * Math.PI * k * Scratch.Cast.toNumber(F0) * this.timer()) / (k * k)
+      }
+      return (8 / Math.PI**2) * value;
+    }
+
+    sawtooth({F0, HARMONICS}) {
+      let value = 0;
+
+      for(let k = 1; k <= Scratch.Cast.toNumber(HARMONICS) * 2; k++) {
+        value += Math.pow(-1, k + 1) * Math.sin(2 * Math.PI * k * Scratch.Cast.toNumber(F0) * this.timer()) / k;
+      }
+
+      return (2 / Math.PI) * value;
+    }
+
+    pulse({F0, HARMONICS, DUTY_CYCLE}) {
+      let value = 0;
+
+      for(let k = 1; k <= Scratch.Cast.toNumber(HARMONICS); k++) {
+        value += Math.sin(2 * Math.PI * k * Scratch.Cast.toNumber(F0) * this.timer()) * Math.sin(Math.PI * k * (Scratch.Cast.toNumber(DUTY_CYCLE) / 100)) / k
+      }
+
+      return (2 / Math.PI) * value;
+    }
+
+    semicircle({F0, RADIUS}) {
+      const T = 1 / Scratch.Cast.toNumber(F0);
+      const phase = this.timer() % T;
+
+      let x = 2 * Scratch.Cast.toNumber(RADIUS) * ((phase % (T / 2)) / (T / 2)) - Scratch.Cast.toNumber(RADIUS);
+
+      const y = Math.sqrt(Scratch.Cast.toNumber(RADIUS) ** 2 - x ** 2)
+
+      return phase < T / 2 ? y : -y
+    }
+  }
+
+Scratch.extensions.register(new WaveformsEXT());})(Scratch)

images/contribution.md

@@ -24,3 +24,6 @@
 
 ## Lemon/TurboAST.png
 - Made by [@BludIsAnLemon](https://scratch.mit.edu/users/BludIsAnLemon/)
+
+## Lemon/Waveforms.png
+- Made by [@BludIsAnLemon](https://scratch.mit.edu/users/BludIsAnLemon/)