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refactor(editor): minor refactor for inverting rotation

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maelstrom 2025-04-04 13:45:36 +02:00
parent 153fbba2d2
commit 575d5a9ea6
1 changed files with 15 additions and 17 deletions
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32
editor/mainglwidget.cpp
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@ -251,28 +251,26 @@ void MainGLWidget::handleRotationalTransform(QMouseEvent* evt) {
// Calculate part pos as screen point
glm::mat4 projection = glm::perspective(glm::radians(45.f), (float)width() / (float)height(), 0.1f, 1000.0f);
glm::mat4 view = camera.getLookAt();
glm::vec4 screenPos = projection * view * glm::vec4((glm::vec3)part->cframe.Position(), 1.f);
screenPos /= screenPos.w * 2;
screenPos += 0.5f;
screenPos = glm::vec4(screenPos.x, 1-screenPos.y, 0, 0);
screenPos *= glm::vec4(width(), height(), 0, 0);
// The rotated part's origin projected onto the screen
glm::vec4 partCenterRaw = projection * view * glm::vec4((glm::vec3)part->cframe.Position(), 1.f);
partCenterRaw /= partCenterRaw.w;
glm::vec2 partCenter = glm::vec2(partCenterRaw.x*0.5f + 0.5f, 1-(partCenterRaw.y*0.5f+0.5f));
partCenter *= glm::vec2(width(), height());
// https://wumbo.net/formulas/angle-between-two-vectors-2d/
glm::vec2 initVec = glm::normalize(startPoint - (glm::vec2)screenPos);
glm::vec2 destVec = glm::normalize(destPoint - (glm::vec2)screenPos);
glm::vec2 initVec = glm::normalize(startPoint - (glm::vec2)partCenter);
glm::vec2 destVec = glm::normalize(destPoint - (glm::vec2)partCenter);
float angle = atan2f(initVec.x * destVec.y - initVec.y * destVec.x, initVec.x * destVec.x + initVec.y * destVec.y);
// Yes, it's messy. But it works so I don't wanna hear it.
// Maybe I'll clean it up next week.
// TODO: ?
glm::vec4 pos1 = projection * view * glm::vec4((glm::vec3)part->cframe.Position(), 1.f);
pos1 /= pos1.w;
glm::vec4 otherVec = projection * view * glm::vec4((glm::vec3)(part->cframe * glm::abs(draggingHandle->normal)), 1.f);
otherVec /= otherVec.w;
glm::vec4 signVec = glm::normalize(otherVec - pos1);
float sign = glm::sign(signVec.z);
// Checks if the rotation axis is facing towards, or away from the camera
// If it pointing away from the camera, then we need to invert the angle change
glm::vec4 rotationAxis = projection * view * glm::vec4((glm::vec3)(part->cframe * glm::abs(draggingHandle->normal)), 1.f);
rotationAxis /= rotationAxis.w;
glm::vec4 signVec = glm::normalize(rotationAxis - partCenterRaw);
float sign = -glm::sign(signVec.z);
glm::vec3 angles = glm::abs(draggingHandle->normal) * -sign * glm::vec3(angle);
glm::vec3 angles = glm::abs(draggingHandle->normal) * sign * glm::vec3(angle);
part->cframe = part->cframe * Data::CFrame::FromEulerAnglesXYZ(-angles);