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Qml特效9-进场动画-菱形

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简介

这是《Qml特效-进场动画》系列文章的第9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涛哥的知乎专栏-Qt进阶之路

菱形效果预览

菱形效果,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

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import QtQuick 2.12
import QtQuick.Controls 2.12
ShaderEffect {
...
enum Direct {
FromInner = 0,
FromOuter = 1
}
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:

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    fragmentShader: TCommon.fragmentShaderCommon + (dir === ASquare.Direct.FromInner ? "
in vec2 qt_TexCoord0;
uniform float qt_Opacity;
uniform sampler2D effectSource;
uniform int percent;
out vec4 fragColor;
void main()
{
vec4 color = texture2D(effectSource, qt_TexCoord0);
float p = float(percent) / 100.0;
float alpha = 1.0;
if (qt_TexCoord0.x + p < qt_TexCoord0.y ||
qt_TexCoord0.x - p > qt_TexCoord0.y ||
1.0 - qt_TexCoord0.x + p < qt_TexCoord0.y ||
1.0 - qt_TexCoord0.x - p > qt_TexCoord0.y
) {
discard;
}
fragColor = color;
}
" : "
in vec2 qt_TexCoord0;
uniform float qt_Opacity;
uniform sampler2D effectSource;
uniform int percent;
out vec4 fragColor;
void main()
{
vec4 color = texture2D(effectSource, qt_TexCoord0);
float p = 1.0 - float(percent) / 100.0;
if (qt_TexCoord0.x + p > qt_TexCoord0.y &&
qt_TexCoord0.x - p < qt_TexCoord0.y &&
1.0 - qt_TexCoord0.x + p > qt_TexCoord0.y &&
1.0 - qt_TexCoord0.x - p < qt_TexCoord0.y
) {
discard;
}
fragColor = color;
}
")
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