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cc_term.js
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cc_term.js
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/*
Copyright 2024 Mason Gulu
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
// To use simply instantiate a new Term, passing in a Canvas.
const fontMapImage = new Image()
// This font is from Computercraft, and is under CCPL.
fontMapImage.src = "data:image/png;base64,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"
const fontMapCanvas = document.createElement('canvas');
const fontMapCtx = fontMapCanvas.getContext('2d');
fontMapCanvas.width = fontMapImage.width
fontMapCanvas.height = fontMapImage.height
fontMapCtx.drawImage(fontMapImage, 0, 0)
let colors = [
"#f0f0f0",
"#f2b233",
"#e57fd8",
"#99b2f2",
"#dede6c",
"#7fcc19",
"#f2b2cc",
"#4c4c4c",
"#999999",
"#4c99b2",
"#b266e5",
"#3366cc",
"#7f664c",
"#57a64e",
"#cc4c4c",
"#111111"
]
const charHeight = 11
const charWidth = 8
const charScreenHeight = 9
const charScreenWidth = 6
const charMapWidth = 16
function rgbToFillstyle(r,g,b,a) {
return `rgba(${r},${g},${b},${a / 255})`
}
class Term {
constructor(termCanvas) {
this.termCanvas = termCanvas
this.termCanvasCtx = termCanvas.getContext("2d")
this.bg = 15
this.fg = 0
this.width = 51
this.height = 19
this.scale = 1
this.cursor = {
x: 0,
y: 0
}
this.fontMapScaledCanvas = document.createElement("canvas")
this.fontMapScaledCtx = this.fontMapScaledCanvas.getContext("2d")
}
clear() {
this.termCanvasCtx.fillStyle = colors[this.bg]
this.termCanvasCtx.fillRect(0, 0, this.termCanvasCtx.canvas.width, this.termCanvasCtx.canvas.height)
}
setSize(w, h) {
this.width = w
this.height = h
this.termCanvasCtx.canvas.width = w * charScreenWidth * this.scale
this.termCanvasCtx.canvas.height = h * charScreenHeight * this.scale
this.clear()
}
#scaleChar(ch) {
let charY = Math.floor(ch / charMapWidth)
let charX = ch % charMapWidth
let fromX = charX * charWidth
let toX = charX * charWidth * this.scale
let fromY = charY * charHeight
let toY = charY * charHeight * this.scale
this.fontMapScaledCtx.clearRect(toX, toY, charWidth * this.scale, charHeight * this.scale)
const imageData = fontMapCtx.getImageData(fromX, fromY, charWidth, charHeight)
const data = imageData.data
for (let y = 0; y < charHeight; y++) {
for (let x = 0; x < charWidth; x++) {
// Get the color of the current pixel
const index = (y * charWidth + x) * 4;
const r = data[index];
const g = data[index + 1];
const b = data[index + 2];
const a = data[index + 3];
if (a > 127) {
// fg color
this.fontMapScaledCtx.fillStyle = colors[this.fg]
} else {
// bg color
this.fontMapScaledCtx.fillStyle = colors[this.bg]
}
// Draw a scaled rectangle for the current pixel on the target canvas
// fontMapScaledCtx.fillStyle = rgbToFillstyle(r,g,b,a)
this.fontMapScaledCtx.fillRect(toX + x * this.scale, toY + y * this.scale, this.scale, this.scale)
}
}
}
setScale(i) {
this.scale = i
const originalWidth = fontMapImage.width
const originalHeight = fontMapImage.height
const scaledWidth = originalWidth * this.scale
const scaledHeight = originalHeight * this.scale
this.fontMapScaledCtx.canvas.width = scaledWidth
this.fontMapScaledCtx.canvas.height = scaledHeight
this.fontMapScaledCtx.clearRect(0, 0, scaledWidth, scaledHeight)
for (i = 0; i < 256; i++) {
this.#scaleChar(i)
}
term.setSize(this.width, this.height)
}
/**
*
* @param {number} x
* @param {number} y
* @param {number} ch
*/
setChar(x, y, ch) {
let charY = Math.floor(ch / charMapWidth)
let charX = ch % charMapWidth
let charW = charScreenWidth * this.scale
let charH = charScreenHeight * this.scale
this.#scaleChar(ch)
this.termCanvasCtx.drawImage(
this.fontMapScaledCtx.canvas,
// from x, y
(charX * charWidth + 1) * this.scale, (charY * charHeight + 1) * this.scale,
// from w, h
charW, charH,
// to x, y
x * charScreenWidth * this.scale, y * charScreenHeight * this.scale,
// to w, h
charW, charH
)
// console.log(ch)
}
/**
* @param {String} str
*/
write(str) {
for (i = 0; i < str.length; i++) {
let code = str.charCodeAt(i)
this.setChar(this.cursor.x, this.cursor.y, code)
this.cursor.x++
if (this.cursor.x >= this.width) {
this.#newline()
}
}
}
scroll(i) {
// oh god this is jank
let charW = charScreenWidth * scale
let charH = charScreenHeight * scale
termCanvasCtx.drawImage(
termCanvasCtx.canvas,
0, 0,
width * charW, height * charH,
0, -i * charScreenHeight * scale,
width * charW, height * charH
)
termCanvasCtx.fillStyle = colors[bg]
termCanvasCtx.fillRect(0, (height - 1) * charH, termCanvasCtx.canvas.width, charH)
}
#newline() {
this.cursor.x = 0
this.cursor.y++
if (this.cursor.y >= this.height) {
this.cursor.y = this.height - 1
this.scroll(1)
}
}
print(str) {
for (i = 0; i < str.length; i++) {
let code = str.charCodeAt(i)
let ch = str.charAt(i)
if (ch == '\n') {
this.#newline()
} else {
this.setChar(cursor.x, cursor.y, code)
cursor.x++
if (cursor.x >= width) {
this.#newline()
}
}
}
this.#newline()
}
blit(text, fgstr, bgstr) {
if (text.length != fgstr.length || fgstr.length != bgstr.length) {
error("Blit arguments must be the same length!")
}
for (i = 0; i < text.length; i++) {
let code = text.charCodeAt(i)
let fgch = fgstr.charAt(i)
let bgch = bgstr.charAt(i)
fg = parseInt(fgch, 16)
bg = parseInt(bgch, 16)
drawCharacter(cursor.x, cursor.y, code)
cursor.x++
}
}
setCursorPos(x,y) {
this.cursor.x = x
this.cursor.y = y
}
setfg(color) {
this.fg = color
}
setbg(color) {
this.bg = color
}
setClickHandler(handle) {
// why does this work...
let test = this
this.termCanvas.addEventListener("click", function(e) {
let rect = e.target.getBoundingClientRect()
let x = e.clientX - rect.left
let y = e.clientY - rect.top
handle(Math.floor(x / charScreenWidth / test.scale), Math.floor(y / charScreenHeight / test.scale))
})
}
setMousemoveHandler(handle) {
let test = this
this.termCanvas.addEventListener("mousemove", function(e) {
let rect = e.target.getBoundingClientRect()
let x = e.clientX - rect.left
let y = e.clientY - rect.top
handle(Math.floor(x / charScreenWidth / test.scale), Math.floor(y / charScreenHeight / test.scale))
})
}
static colors = {
white:0,
orange:1,
magenta:2,
lightBlue:3,
yellow:4,
lime:5,
pink:6,
gray:7,
lightGray:8,
cyan:9,
purple:10,
blue:11,
brown:12,
green:13,
red:14,
black:15
}
}