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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| { | ||
| "cells": [ | ||
| { | ||
| "cell_type": "markdown", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "---\n", | ||
| "toc: true\n", | ||
| "comments: true\n", | ||
| "layout: post\n", | ||
| "title: Dog Sprite Example\n", | ||
| "description: Lil Dog\n", | ||
| "courses: { compsci: {week: 5} }\n", | ||
| "type: hacks\n", | ||
| "---" | ||
| ] | ||
| }, | ||
| { | ||
| "cell_type": "markdown", | ||
| "metadata": {}, | ||
| "source": [ | ||
| "\n", | ||
| "\n", | ||
| "<body>\n", | ||
| " <div>\n", | ||
| " <canvas id=\"spriteContainer\"> <!-- Within the base div is a canvas. An HTML canvas is used only for graphics. It allows the user to access some basic functions related to the image created on the canvas (including animation) -->\n", | ||
| " <img id=\"dogSprite\" src=\"{{site.baseurl}}/images/dogSprite.png\"> \n", | ||
| " </canvas>\n", | ||
| " <div id=\"controls\"> <!--basic radio buttons which can be used to check whether each individual animaiton works -->\n", | ||
| " <input type=\"radio\" name=\"animation\" id=\"idle\" checked>\n", | ||
| " <label for=\"idle\">Idle</label><br>\n", | ||
| " <input type=\"radio\" name=\"animation\" id=\"barking\">\n", | ||
| " <label for=\"barking\">Barking</label><br>\n", | ||
| " <input type=\"radio\" name=\"animation\" id=\"walking\">\n", | ||
| " <label for=\"walking\">Walking</label><br>\n", | ||
| " </div>\n", | ||
| " </div>\n", | ||
| "</body>\n", | ||
| "\n", | ||
| "<script>\n", | ||
| " // start on page load\n", | ||
| " window.addEventListener('load', function () {\n", | ||
| " const canvas = document.getElementById('spriteContainer');\n", | ||
| " const ctx = canvas.getContext('2d');\n", | ||
| " const SPRITE_WIDTH = 160; // matches sprite pixel width\n", | ||
| " const SPRITE_HEIGHT = 144; // matches sprite pixel height\n", | ||
| " const SCALE_FACTOR = 2; // control size of sprite on canvas\n", | ||
| " const FRAME_LIMIT = 48; // number of frames per row, this code assume each row is same\n", | ||
| " // const FRAME_RATE = 15; // not used\n", | ||
| "\n", | ||
| " canvas.width = SPRITE_WIDTH * SCALE_FACTOR;\n", | ||
| " canvas.height = SPRITE_HEIGHT * SCALE_FACTOR;\n", | ||
| "\n", | ||
| " class Dog {\n", | ||
| " constructor() {\n", | ||
| " this.image = document.getElementById(\"dogSprite\");\n", | ||
| " this.spriteWidth = SPRITE_WIDTH;\n", | ||
| " this.spriteHeight = SPRITE_HEIGHT;\n", | ||
| " this.width = this.spriteWidth;\n", | ||
| " this.height = this.spriteHeight;\n", | ||
| " this.x = 0;\n", | ||
| " this.y = 0;\n", | ||
| " this.scale = SCALE_FACTOR;\n", | ||
| " this.minFrame = 0;\n", | ||
| " this.maxFrame = FRAME_LIMIT;\n", | ||
| " this.frameX = 0;\n", | ||
| " this.frameY = 0;\n", | ||
| " }\n", | ||
| "\n", | ||
| " // draw dog object\n", | ||
| " draw(context) {\n", | ||
| " context.drawImage(\n", | ||
| " this.image,\n", | ||
| " this.frameX * this.spriteWidth,\n", | ||
| " this.frameY * this.spriteHeight,\n", | ||
| " this.spriteWidth,\n", | ||
| " this.spriteHeight,\n", | ||
| " this.x,\n", | ||
| " this.y,\n", | ||
| " this.width * this.scale,\n", | ||
| " this.height * this.scale\n", | ||
| " );\n", | ||
| " }\n", | ||
| "\n", | ||
| " // update frameX of object\n", | ||
| " update() {\n", | ||
| " if (this.frameX < this.maxFrame) {\n", | ||
| " this.frameX++;\n", | ||
| " } else {\n", | ||
| " this.frameX = 0;\n", | ||
| " }\n", | ||
| " }\n", | ||
| " }\n", | ||
| "\n", | ||
| " // dog object\n", | ||
| " const dog = new Dog();\n", | ||
| "\n", | ||
| " // update frameY of dog object, action from idle, bark, walk radio control\n", | ||
| " const controls = document.getElementById('controls');\n", | ||
| " controls.addEventListener('click', function (event) {\n", | ||
| " if (event.target.tagName === 'INPUT') {\n", | ||
| " const selectedAnimation = event.target.id;\n", | ||
| " switch (selectedAnimation) {\n", | ||
| " case 'idle':\n", | ||
| " dog.frameY = 0;\n", | ||
| " break;\n", | ||
| " case 'barking':\n", | ||
| " dog.frameY = 1;\n", | ||
| " break;\n", | ||
| " case 'walking':\n", | ||
| " dog.frameY = 2;\n", | ||
| " break;\n", | ||
| " default:\n", | ||
| " break;\n", | ||
| " }\n", | ||
| " }\n", | ||
| " });\n", | ||
| "\n", | ||
| " // Animation recursive control function\n", | ||
| " function animate() {\n", | ||
| " // Clears the canvas to remove the previous frame.\n", | ||
| " ctx.clearRect(0, 0, canvas.width, canvas.height);\n", | ||
| "\n", | ||
| " // Draws the current frame of the sprite.\n", | ||
| " dog.draw(ctx);\n", | ||
| "\n", | ||
| " // Updates the `frameX` property to prepare for the next frame in the sprite sheet.\n", | ||
| " dog.update();\n", | ||
| "\n", | ||
| " // Uses `requestAnimationFrame` to synchronize the animation loop with the display's refresh rate,\n", | ||
| " // ensuring smooth visuals.\n", | ||
| " requestAnimationFrame(animate);\n", | ||
| " }\n", | ||
| "\n", | ||
| " // run 1st animate\n", | ||
| " animate();\n", | ||
| " });\n", | ||
| "</script>" | ||
| ] | ||
| } | ||
| ], | ||
| "metadata": { | ||
| "kernelspec": { | ||
| "display_name": "Python 3", | ||
| "language": "python", | ||
| "name": "python3" | ||
| }, | ||
| "language_info": { | ||
| "codemirror_mode": { | ||
| "name": "ipython", | ||
| "version": 3 | ||
| }, | ||
| "file_extension": ".py", | ||
| "mimetype": "text/x-python", | ||
| "name": "python", | ||
| "nbconvert_exporter": "python", | ||
| "pygments_lexer": "ipython3", | ||
| "version": "3.11.4" | ||
| }, | ||
| "orig_nbformat": 4 | ||
| }, | ||
| "nbformat": 4, | ||
| "nbformat_minor": 2 | ||
| } |
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