Posted in Python onJune 02, 2020
Qt5以后的版本,主要加大的对Qt Quick的改进。现实最新的版本可以利用Qt Quick实现很多的绚丽的效果。此里只是利用画布Canvas简单钟表的效果。效果如下:
源码如下
import QtQuick 2.6 import QtQuick.Window 2.2 Window { visible: true width: 740 height: 680 title: qsTr("Hello World") id:window //color: "red"; Canvas { id : canvas anchors.fill: parent width: 740 height: 680 onPaint: { var ctx = getContext("2d"); drawBack(ctx); drawDot(ctx); var date = new Date(); var hours = date.getHours() hours = hours%12; var minutes = date.getMinutes() var seconds = date.getUTCSeconds(); var timestr =date.toLocaleString("yyyy-MM-dd hh:mm:ss"); console.log(date.toLocaleString("yyyy-MM-dd hh:mm:ss")); drawSecond(seconds,ctx); drawHour(hours,minutes,ctx); drawMinute(minutes,seconds,ctx); drawSecond(seconds,ctx); } } function drawBack(ctx) { var r = 200; ctx.save(); ctx.beginPath(); ctx.translate(width/2,height/2); ctx.clearRect(-r,-r,r*2,r*2); ctx.lineWidth = 10; ctx.arc(0,0,r-5,0,Math.PI*2,false); //外圆 ctx.stroke(); //画文本 var numbers = [1,2,3,4,5,6,7,8,9,10,11,12]; ctx.font = "18px Arial"; ctx.textAlign = "center"; ctx.textBaseline = "middle"; for(var i = 0; i < 12; ++i) { var rad = 2*Math.PI/12*numbers[i]-3.14/2; var x = Math.cos(rad)*(r-30); var y = Math.sin(rad)*(r-30); ctx.fillText(numbers[i],x,y); } //画刻度 ctx.lineWidth = 2; for (var i = 0; i <60; ++i) { ctx.beginPath(); var rad = 2*Math.PI/60*i; var x = Math.cos(rad)*(r-15); var y = Math.sin(rad)*(r-15); var x2 = Math.cos(rad)*(r-10); var y2 = Math.sin(rad)*(r-10); //通过画线也可以 if (i%5 === 0) {ctx.strokeStyle="#000000";} else { ctx.strokeStyle = "#989898";} ctx.moveTo(x,y); ctx.lineTo(x2,y2); ctx.stroke(); //画圆实现 // if (i%5 === 0) // {ctx.fillStyle="#000000";} // else // { ctx.fillStyle = "#FFFFFF";} // ctx.arc(x,y,2,0,3.15*2,false); // ctx.fill(); } ctx.restore(); } function drawHour(hour, minute, ctx) { var r = 200; ctx.save(); ctx.beginPath(); //必须写 ctx.lineWidth = 7; ctx.lineCap = "round"; ctx.translate(width/2,height/2); var rad = Math.PI*2/12*hour+Math.PI*2*minute/12/60-Math.PI; ctx.rotate(rad); ctx.moveTo(0,-10); ctx.lineTo(0,r/2-10); ctx.stroke(); //必须写(填充方式) ctx.restore(); } function drawMinute(minute,second,ctx) { var r = 200; ctx.save(); ctx.beginPath(); //必须写 ctx.lineWidth = 5; ctx.lineCap = "round"; ctx.translate(width/2,height/2); var rad = Math.PI*2*minute/60 + Math.PI*2*second/60/60 -Math.PI; ctx.rotate(rad); ctx.moveTo(0,-10); ctx.lineTo(-10,r*3/5-10); ctx.stroke(); //必须写(填充方式) ctx.restore(); } function drawSecond(second,ctx) { var r = 200; ctx.save(); ctx.beginPath(); //必须写 ctx.lineWidth = 3; ctx.lineCap = "round"; ctx.translate(width/2,height/2); ctx.strokeStyle="#ff0000"; var rad = Math.PI*2*second/60-Math.PI; ctx.rotate(rad); ctx.moveTo(0,-20); ctx.lineTo(0,r*4/5-10); ctx.stroke(); //必须写(填充方式) ctx.restore(); } function drawDot(ctx) { ctx.save(); ctx.beginPath(); //必须写 ctx.translate(width/2,height/2); ctx.fillStyle="#ffffff"; ctx.arc(0,0,3,0,Math.PI*2); ctx.fill(); //必须写(填充方式) ctx.restore(); } //定时器 Timer { interval: 1000; running: true; repeat: true onTriggered: canvas.requestPaint(); } }
利用定时器实现动态效果。
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持三水点靠木。
QML实现钟表效果
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