dd759378563 |
2019-06-09 18:27 |
Qml特效5-进场动画-百叶窗
Qml特效5-进场动画-百叶窗 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5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 百叶窗效果预览 百叶窗效果,支持向左、向右、向上、向下四个方向
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 { ... //枚举声明四种方向 enum Direct { FromLeft = 0, FromRight = 1, FromTop = 2, FromBottom = 3 } property int dir: ASlowEnter.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:
- in vec2 qt_TexCoord0;
uniform float qt_Opacity; uniform sampler2D effectSource; uniform int dir; uniform int percent; uniform int perLen; uniform int count; out vec4 fragColor; void main() { vec4 color = texture2D(effectSource, qt_TexCoord0); int len = 0; float coords[] = float[](qt_TexCoord0.x, qt_TexCoord0.y, qt_TexCoord0.x, qt_TexCoord0.y); int percents[] = int[](percent, percent, perLen - percent, perLen - percent); len = int(coords[dir]* float(perLen) * float(count)); float alpha = float(step(percents[dir], mod(len, perLen))); float alphas[] = float[](1.0 - alpha, 1.0 - alpha, alpha, alpha); alpha = qt_Opacity * alphas[dir]; fragColor = vec4(color.rgb * alpha, alpha); }
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