画布 - Canvas
# Canvas
canvas提供了使用画布进行2D画图的支持，可用于简单的小游戏开发或者图片编辑。使用canvas可以轻松地在一张图片或一个界面上绘制各种线与图形。
canvas的坐标系为平面直角坐标系，以屏幕左上角为原点，屏幕上边为x轴正方向，屏幕左边为y轴正方向。例如分辨率为1920*1080的屏幕上，画一条从屏幕左上角到屏幕右下角的线段为:
```js
canvas.drawLine(0, 0, 1080, 1920, paint);
```
canvas的绘制依赖于画笔Paint, 通过设置画笔的粗细、颜色、填充等可以改变绘制出来的图形。例如绘制一个红色实心正方形为：
```js
var paint = new Paint();
//设置画笔为填充，则绘制出来的图形都是实心的
paint.setStyle(Paint.STYLE.FILL);
//设置画笔颜色为红色
paint.setColor(colors.RED);
//绘制一个从坐标(0, 0)到坐标(100, 100)的正方形
canvas.drawRect(0, 0, 100, 100, paint);
```
如果要绘制正方形的边框，则通过设置画笔的Style来实现：
```js
var paint = new Paint();
//设置画笔为描边，则绘制出来的图形都是轮廓
paint.setStyle(Paint.STYLE.STROKE);
//设置画笔颜色为红色
paint.setColor(colors.RED);
//绘制一个从坐标(0, 0)到坐标(100, 100)的正方形
canvas.drawRect(0, 0, 100, 100, paint);
结合画笔canvas可以绘制基本图形、图片等。
```
## canvas.drawARGB(a, r, g, b)
## canvas.draw
# 示例
## 函数图像高级版
```js
"ui";
//ui布局为一块画布和一些函数调整控件
ui.layout(
<vertical>
<linear>
<input id="fx" textSize="16sp" text="x*x+3*x-4" layout_weight="1"/>
<button id="ok" w="50dp"/>
</linear>
<linear>
<button id="left" text="←" layout_weight="1"/>
<button id="right" text="→" layout_weight="1"/>
<button id="up" text="↓" layout_weight="1"/>
<button id="down" text="↑" layout_weight="1"/>
<button id="zoom_in" text="+" layout_weight="1"/>
<button id="zoom_out" text="-" layout_weight="1"/>
</linear>
<canvas id="board" w="*" h="*"/>
</vertical>
);
//函数表达式
var f = "x*x+3*x-4";
//绘制区间
var minX = -5;
var maxX = 5;
var minY;
var h = 1;
var w = 1;
//画笔
var paint = new Paint();
paint.setStrokeWidth(2);
ui.board.on("draw", function(canvas){
w = canvas.getWidth();
h = canvas.getHeight();
if(minY == undefined){
minY = -(maxX - minX) * h / w / 2;
}
//计算y轴区间上限
var maxY = minY + (maxX - minX) * h / w;
//设置画笔颜色为黑色
paint.setColor(colors.parseColor("#000000"));
//绘制两个坐标轴
var x0 = parseInt(- minX / (maxX - minX) * w);
canvas.drawLine(x0, 0, x0, h, paint);
var y0 = parseInt(h + minY / (maxY - minY) * h);
canvas.drawLine(0, y0, w, y0, paint);
//设置画笔颜色为红色
paint.setColor(colors.parseColor("#ff0000"));
//绘制图像
for(var i = 0; i < w; i++){
var x = minX + i / w * (maxX - minX);
var y = eval(f);
var j = h - (y - minY) / (maxY - minY) * h;
canvas.drawPoint(i, j, paint);
}
});
ui.ok.click(()=>{
f = String(ui.fx.text());
});
ui.left.click(()=>{
var d = maxX - minX;
maxX -= d / 10;
minX -= d / 10;
});
ui.right.click(()=>{
var d = maxX - minX;
maxX += d / 10;
minX += d / 10;
});
ui.up.click(()=>{
var d = maxX - minX;
minY += d / 8;
});
ui.down.click(()=>{
var d = maxX - minX;
minY -= d / 8;
});
ui.zoom_in.click(()=>{
var d = maxX - minX;
var a = (maxX + minX) / 2;
maxX = a + d;
minX = a - d;
minY *= (maxX - minY) / d * h / w;
});
ui.zoom_out.click(()=>{
var d = maxX - minX;
maxX -= d / 2;
minX += d / 2;
});
```
## 函数图像简单版
```js
"ui";
//ui布局为一块画布
ui.layout(
<frame>
<canvas id="board" w="*" h="*"/>
</frame>
);
//要绘制的函数，这里是一个一元二次函数
var f = function(x){
return x * x + 3 * x - 4;
}
//绘制区间
var minX = -5;
var maxX = 5;
var minY = -10;
//画笔
var paint = new Paint();
ui.board.on("draw", function(canvas){
var w = canvas.getWidth();
var h = canvas.getHeight();
//计算y轴区间上限
var maxY = minY + (maxX - minX) * h / w;
//设置画笔颜色为黑色
paint.setColor(colors.parseColor("#000000"));
//绘制两个坐标轴
canvas.drawLine(w / 2, 0, w / 2, h, paint);
canvas.drawLine(0, h / 2, w, h / 2, paint);
//设置画笔颜色为红色
paint.setColor(colors.parseColor("#ff0000"));
//绘制图像
for(var i = 0; i < w; i++){
var x = minX + i / w * (maxX - minX);
var y = f(x);
var j = h - (y - minY) / (maxY - minY) * h;
canvas.drawPoint(i, j, paint);
}
});
```
## 贪吃蛇
```js
"ui";
ui.layout(
<vertical>
<canvas id="board" layout_weight="1"/>
<relative h="120">
<button id="up" text="↑" w="60" h="60" layout_alignParentTop="true" layout_centerHorizontal="true"/>
<button id="left" text="←" w="60" h="60" layout_alignParentBottom="true" layout_toLeftOf="@id/down"/>
<button id="down" text="↓" w="60" h="60" layout_alignParentBottom="true" layout_centerHorizontal="true"/>
<button id="right" text="→" w="60" h="60" layout_alignParentBottom="true" layout_toRightOf="@id/down"/>
</relative>
</vertical>
);
//蛇的颜色
const SNAKE_COLOR = colors.parseColor("#4caf50");
//背景色
const BG_COLOR = colors.parseColor("#ffffff");
//苹果颜色
const APPLE_COLOR = colors.parseColor("#f44336");
//墙的颜色
const WALL_COLOR = colors.parseColor("#607d8b");
//文本颜色
const TEXT_COLOR = colors.parseColor("#03a9f4");
//蛇自动移动的时间间隔，调小可以增加难度
const MOVE_INTERVAL = 500;
//方块宽度
const BLOCK_WIDTH = 40;
//游戏区域宽高
const GAME_BOARD_HEIGHT = 20;
const GAME_BOARD_WIDTH = 15;
//蛇的四个移动方向
const DIRECTION_LEFT = {x: -1, y: 0};
const DIRECTION_RIGHT = {x: 1, y: 0};
const DIRECTION_UP = {x: 0, y: -1};
const DIRECTION_DOWN = {x: 0, y: 1};
//蛇，是一个蛇身的坐标的数组
var snake = [{x: 4, y: 2}, {x: 3, y: 2}, {x: 2, y: 2}];
//苹果的坐标
var apple = generateApple();
//当前蛇的移动方向
var direction = DIRECTION_RIGHT;
//标记游戏是否结束
var isGameOver = false;
//分数
var score = 0;
var paint = new Paint();
ui.board.on("draw", function(canvas){
//绘制背景色
canvas.drawColor(BG_COLOR);
//绘制分数
paint.setColor(TEXT_COLOR);
paint.setTextSize(50);
canvas.drawText("分数: " + score, 30, 70, paint);
//如果游戏结束则绘制游戏结束字样
if(isGameOver){
canvas.drawText("游戏结束！", canvas.getWidth() - 280, 70, paint);
}
//计算坐标偏移，是的游戏区域绘制在画面的水平居中位置
var offset = {
x: (canvas.getWidth() - (GAME_BOARD_WIDTH + 2) * BLOCK_WIDTH) / 2,
y: 100
};
//偏移坐标
canvas.translate(offset.x, offset.y);
//绘制围墙
paint.setColor(WALL_COLOR);
for(var i = 0; i <= GAME_BOARD_WIDTH + 1; i++){
//上围墙
drawBlock(canvas, paint, i, 0);
//下围墙
drawBlock(canvas, paint, i, GAME_BOARD_HEIGHT + 1);
}
for(var i = 0; i <= GAME_BOARD_HEIGHT + 1; i++){
//左围墙
drawBlock(canvas, paint, 0, i);
//右围墙
drawBlock(canvas, paint, GAME_BOARD_WIDTH + 1, i);
}
//绘制蛇身
paint.setColor(SNAKE_COLOR);
for(var i = 0; i < snake.length; i++){
drawBlock(canvas, paint, snake[i].x, snake[i].y);
}
//绘制苹果
paint.setColor(APPLE_COLOR);
drawBlock(canvas, paint, apple.x, apple.y);
});
//启动游戏线程
var gameThread = threads.start(game);
//按键点击时改变蛇的移动方向
ui.left.on("click", ()=> direction = DIRECTION_LEFT);
ui.right.on("click", ()=> direction = DIRECTION_RIGHT);
ui.up.on("click", ()=> direction = DIRECTION_UP);
ui.down.on("click", ()=> direction = DIRECTION_DOWN);
function game(){
//每隔一段时间让蛇自动前进
setInterval(()=>{
move(direction.x, direction.y);
}, MOVE_INTERVAL);
}
function move(dx, dy){
log("move: %d, %d", dx, dy);
direction.x = dx;
direction.y = dy;
//蛇前进时把一个新的方块添加到蛇头前面
var head = snake[0];
snake.splice(0, 0, {
x: head.x + dx,
y: head.y + dy
});
//如果蛇头吃到了苹果
if(snakeEatsApple()){
//添加分数和重新生成苹果
score += 5;
apple = generateApple();
}else{
//没有吃到苹果的情况下把蛇尾去掉保持蛇身长度不变
snake.pop();
}
//碰撞检测
collisionTest();
}
function snakeEatsApple(){
return snake[0].x == apple.x && snake[0].y == apple.y;
}
function generateApple(){
//循环生成苹果直至苹果不会生成在蛇身上
var x, y;
do{
x = random(1, GAME_BOARD_WIDTH);
y = random(1, GAME_BOARD_HEIGHT);
}while(!isAppleValid(x, y));
return {x: x, y: y};
}
function isAppleValid(x, y){
for (var i = 0; i < snake.length; i++) {
if (snake[i].x == x && snake[i].y == y) {
return false;
}
}
return true;
}
function collisionTest(){
//检测蛇有没有撞到墙上
var head = snake[0];
if(head.x < 1 || head.x > GAME_BOARD_WIDTH
|| head.y < 1 || head.y > GAME_BOARD_HEIGHT){
gameOver();
return;
}
//检测蛇有没有撞到自己
for(var i = 1; i < snake.length; i++){
if(snake[i].x == head && snake[i].y == head){
gameOver();
return;
}
}
}
function gameOver(){
gameThread.interrupt();
isGameOver = true;
}
function drawBlock(canvas, paint, x, y){
x *= BLOCK_WIDTH;
y *= BLOCK_WIDTH;
canvas.drawRect(x, y, x + BLOCK_WIDTH, y + BLOCK_WIDTH, paint);
}
```
## 贪吃蛇重力感应版
```js
"ui";
ui.layout(
<vertical>
<canvas id="board"/>
</vertical>
);
//蛇的颜色
const SNAKE_COLOR = colors.parseColor("#9EDBB0");
//背景色
const BG_COLOR = colors.parseColor("#ffffff");
//文本颜色
const TEXT_COLOR = colors.parseColor("#03a9f4");
//蛇头图片
const SNAKE_HEAD = images.fromBase64("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");
//苹果图片
const APPLE = 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");
//围墙方块图片
const WALL_BLOCK = 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//方块宽度
const BLOCK_WIDTH = 40;
//游戏区域宽高
const GAME_BOARD_HEIGHT = 20;
const GAME_BOARD_WIDTH = 15;
//蛇的四个移动方向
const DIRECTION_LEFT = {x: -1, y: 0, angle: 180};
const DIRECTION_RIGHT = {x: 1, y: 0, angle: 0};
const DIRECTION_UP = {x: 0, y: -1, angle:270};
const DIRECTION_DOWN = {x: 0, y: 1, angle: 90};
//蛇，是一个蛇身的坐标的数组
var snake = [{x: 4, y: 2}, {x: 3, y: 2}, {x: 2, y: 2}];
//苹果的坐标
var apple = generateApple();
//当前蛇的移动方向
var direction = DIRECTION_RIGHT;
//标记游戏是否结束
var isGameOver = false;
//蛇自动移动的时间间隔，调小可以增加难度
var MOVE_INTERVAL = 500;
//分数
var score = 0;
//难度
var level = 5;
var gameThread = null;
dialogs.input("请输入难度(1~10)", level)
.then(function(l){
level = Math.max(1, Math.min(10, l));
MOVE_INTERVAL = 1000 - level * 100;
//启动游戏线程
gameThread = threads.start(game);
toast("通过重力感应来改变蛇的移动方向");
});
function game(){
//每隔一段时间让蛇自动前进
setInterval(()=>{
move(direction.x, direction.y);
}, MOVE_INTERVAL);
}
function move(dx, dy){
log("move: %d, %d", dx, dy);
direction.x = dx;
direction.y = dy;
//蛇前进时把一个新的方块添加到蛇头前面
var head = snake[0];
snake.splice(0, 0, {
x: head.x + dx,
y: head.y + dy
});
//如果蛇头吃到了苹果
if(snakeEatsApple()){
//添加分数和重新生成苹果
score += 5;
apple = generateApple();
}else{
//没有吃到苹果的情况下把蛇尾去掉保持蛇身长度不变
snake.pop();
}
//碰撞检测
collisionTest();
}
function snakeEatsApple(){
return snake[0].x == apple.x && snake[0].y == apple.y;
}
function generateApple(){
//循环生成苹果直至苹果不会生成在蛇身上
var x, y;
do{
x = random(1, GAME_BOARD_WIDTH);
y = random(1, GAME_BOARD_HEIGHT);
}while(!isAppleValid(x, y));
return {x: x, y: y};
}
function isAppleValid(x, y){
for (var i = 0; i < snake.length; i++) {
if (snake[i].x == x && snake[i].y == y) {
return false;
}
}
return true;
}
function collisionTest(){
//检测蛇有没有撞到墙上
var head = snake[0];
if(head.x < 1 || head.x > GAME_BOARD_WIDTH
|| head.y < 1 || head.y > GAME_BOARD_HEIGHT){
gameOver();
return;
}
//检测蛇有没有撞到自己
for(var i = 1; i < snake.length; i++){
if(equals(snake[i], head)){
gameOver();
return;
}
}
}
function gameOver(){
gameThread.interrupt();
isGameOver = true;
}
//监听重力传感器实现重力改变蛇的移动方向
sensors.register("gravity", sensors.delay.game)
.on("change", function(event, gx, gy, gz){
if(Math.abs(gx) > Math.abs(gy) && Math.abs(gx) > 1.8){
setDirection(gx > 0 ? DIRECTION_LEFT : DIRECTION_RIGHT);
}
if(Math.abs(gy) > Math.abs(gx) && Math.abs(gy) > 1.8){
setDirection(gy > 0 ? DIRECTION_DOWN: DIRECTION_UP);
}
});
function setDirection(d){
if(equals(d, DIRECTION_LEFT) && equals(direction, DIRECTION_RIGHT))
return;
if(equals(d, DIRECTION_RIGHT) && equals(direction, DIRECTION_LEFT))
return;
if(equals(d, DIRECTION_DOWN) && equals(direction, DIRECTION_UP))
return;
if(equals(d, DIRECTION_UP) && equals(direction, DIRECTION_DOWN))
return;
direction = d;
}
var paint = new Paint();
ui.board.on("draw", function(canvas){
//绘制背景色
canvas.drawColor(BG_COLOR);
//绘制分数等信息
paint.setColor(TEXT_COLOR);
paint.setTextSize(50);
canvas.drawText("分数: " + score, 30, 70, paint);
canvas.drawText("难度: " + level, 400, 70, paint);
//如果游戏结束则绘制游戏结束字样
if(isGameOver){
canvas.drawText("游戏结束！", canvas.getWidth() - 280, 70, paint);
}
//计算坐标偏移，是的游戏区域绘制在画面的水平居中位置
var offset = {
x: (canvas.getWidth() - (GAME_BOARD_WIDTH + 2) * BLOCK_WIDTH) / 2,
y: 100
};
//偏移坐标
canvas.translate(offset.x, offset.y);
//绘制围墙
drawWall(canvas, paint);
//绘制蛇头
drawSnakeHead(canvas, paint);
//绘制蛇身
drawSnakeBody(canvas, paint);
//绘制苹果
canvas.drawImage(APPLE, apple.x * BLOCK_WIDTH, apple.y * BLOCK_WIDTH, paint);
});
function drawWall(canvas, paint){
for(var i = 0; i <= GAME_BOARD_WIDTH + 1; i++){
//上围墙
drawBlock(canvas, paint, i, 0);
//下围墙
drawBlock(canvas, paint, i, GAME_BOARD_HEIGHT + 1);
}
for(var i = 0; i <= GAME_BOARD_HEIGHT + 1; i++){
//左围墙
drawBlock(canvas, paint, 0, i);
//右围墙
drawBlock(canvas, paint, GAME_BOARD_WIDTH + 1, i);
}
}
function drawBlock(canvas, paint, x, y){
x *= BLOCK_WIDTH;
y *= BLOCK_WIDTH;
canvas.drawImage(WALL_BLOCK, x, y, paint);
}
function drawSnakeHead(canvas, paint){
var x = snake[0].x * BLOCK_WIDTH;
var y = snake[0].y * BLOCK_WIDTH;
var matrix = new android.graphics.Matrix();
matrix.postRotate(direction.angle, SNAKE_HEAD.getWidth() / 2, SNAKE_HEAD.getHeight() / 2);
matrix.postTranslate(x, y);
canvas.drawImage(SNAKE_HEAD, matrix, paint);
}
function drawSnakeBody(canvas, paint){
paint.setColor(SNAKE_COLOR);
for(var i = 1; i < snake.length; i++){
var x = snake[i].x * BLOCK_WIDTH;
var y = snake[i].y * BLOCK_WIDTH;
canvas.drawCircle(x + BLOCK_WIDTH / 2, y + BLOCK_WIDTH / 2, BLOCK_WIDTH / 2, paint);
}
}
function equals(point1, point2){
return point1.x == point2.x && point1.y == point2.y;
}
```