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Qml特效6-进场动画-方盒 目录(放个目录方便预览。这个目录是从博客复制过来的,点击会跳转到博客) 简介 这是《Qml特效-进场动画》系列文章的第6篇,涛哥将会教大家一些Qml进场动画相关的知识。进场动画效果 参考了WPS版ppt的动画,基本效果已经全部实现,可以到github TaoQuick项目中预览:进场动画预览 关于文章 文章主要发布在涛哥的博客 和 涛哥的知乎专栏-Qt进阶之路 方盒效果预览 方盒效果,支持由内到外、由外到内两种 实现原理 通过数值动画,控制百分比属性percent从0 到100变化- import QtQuick 2.12
- import QtQuick.Controls 2.12
- ShaderEffect {
- ...
- enum Direct {
- FromInner = 0,
- FromOuter = 1
- }
- property int dir: ASquare.Direct.FromLeft
- property int percent: 0
- opacity: percent > 0 ? 1 : 0
- NumberAnimation {
- id: animation
- target: r
- property: "percent"
- from: 0
- to: 100
- alwaysRunToEnd: true
- loops: 1
- duration: 1000
- }
- ...
- }
在Shader中,使用glsl片段着色器实现像素的控制:- fragmentShader: TCommon.fragmentShaderCommon + (dir === ASquare.Direct.FromInner ? "
- in vec2 qt_TexCoord0;
- uniform float qt_Opacity;
- uniform sampler2D effectSource;
- uniform int dir;
- uniform int percent;
- out vec4 fragColor;
- void main()
- {
- vec4 color = texture2D(effectSource, qt_TexCoord0);
- float p = float(percent) / 200.0;
- float alpha = step(0.5 - p, qt_TexCoord0.x) * (1.0 - step(0.5 + p, qt_TexCoord0.x)) * step(0.5 - p, qt_TexCoord0.y) * (1.0 - step(0.5 + p, qt_TexCoord0.y)) * qt_Opacity;
- fragColor = vec4(color.rgb * alpha, alpha);
- }
- " : "
- in vec2 qt_TexCoord0;
- uniform float qt_Opacity;
- uniform sampler2D effectSource;
- uniform int dir;
- uniform int percent;
- out vec4 fragColor;
- void main()
- {
- vec4 color = texture2D(effectSource, qt_TexCoord0);
- float p = float(percent) / 200.0;
- float alpha = 0.0;
- if (qt_TexCoord0.x <= p || qt_TexCoord0.x >= 1.0 - p) {
- alpha = 1.0;
- } else if (qt_TexCoord0.y <= p || qt_TexCoord0.y >= 1.0 - p) {
- alpha = 1.0;
- }
- alpha = alpha * qt_Opacity;
- fragColor = vec4(color.rgb * alpha, alpha);
- }
- ")
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